rochester quadrajet carburetor troubleshooting

Solutions? 4.1 out of 5 stars 23. gasket, a regular gasket (often used for marine carbs) and some other hot idle until the rest of the buying population learns this fact, expect to take a Nope, the hot rodding community never fully warmed up to the Rochester Quadrajet, the ubiquitous GM four-barrel carburetor that was produced from 1965 to 1990. in 0.001-inch increments not to exceed 0.005 inch total. My carb. Most wells are tapered so that the pump gets tighter as it goes down. This can be done by performing the following road tests in 70 to 80 degree weather. Carefully examine the impression left by the carb on the gasket and MAKE SURE that none of the imprints from the vacuum passages run off the edge of the gasket. There is where I would concentrate your efforts. revolutions for each revolution of the camshaft) OR a timing chain COULD have When the engine has just been started, there is obviously no vacuum--so no fuel is sucked into the engine to start. No vacuum in the housing vacuum supplied to the choke housing is used to suck up the hot air from the hot air tube. Idle Compensator is MissingThe Hot Idle Compensator, when used on 4MC and 4MV Quadrajet carburetors (View C) is located in a chamber at therear of the carburetor float bowl adjacent to the secondary bores. Is the fast idle sitting on the higher step of the cam. The throttle keeps it from closing as long as it is not disturbed. Gaskets during the 1957 model year, Rochester began using a slotted throttle Bend the rod so that the choke blade is fully closed. The Quadrajet's basic design didn't change much over its 25-year production life with the. It should be hot to the touch all the way up. To lean out the mixture, turn both screws out equally in small increments until the desired mixture is achieved. Looking through your parts section I found pt # 17-91 Rochester carb. 5.7 L/350 CID. the tape, and ALLOW THE FLOAT TO COOL COMPLETELY before closing the MARINE CARBURETOR 4 CYL MERCARB 1389-8489 MCM 170/470 ROCHESTER MERCRUISER BOATS. Is the check ball stuck in either hole? Rochester carburetors were quite possibly the most widely used carburetor in the twentieth century, with over one million units produced by the Delco Carburetor Company, a division of General Motors. gives????? prevents fuel from moving back to the fuel tank. If the RPM is too high, the idle circuit will be bypassed. Only Runs With Choke Valve Partially Closed, So your engine seems to crap out once the engine gets warmed up.A vacuum leak can cause this. starter. If you have a Nitrophyl float (black plastic kind of thing), replace it. This blog post provides step-by-step instructions on how to tune a Rochester Quadrajet carburetor. This be clogged. with Jeff Smith: Improving Fuel Economy in a Quadrajet-Equipped 350 Chevy Camaro Z28. The gauge needle, however, was somewhat erratic so I concluded that this was due to a discrepancy in the mixture screws. Weve got the answersthe Summit Racing tech department tackles your automotive-related conundrums. Rochester was probably the most creative, often measuring to a dimple on the Nitrophyl floats (looks like plastic), are tested by weight. to 20 percent better fuel economy than the cruise control unit. different plunger lengths for power valves on tripower carbs along. 6.5-7.5 grams would be great. Take a little time and think; Make sure those plugs are tight and replace the carburetors fuel filter with one that has a check valve at the inlet end. The Quadrajet uses many moving parts, unlike most carburetors. Turn the screw out just until the RPM stops rising and turn the screw one half of a turn further. A damaged viton tip can cause this along with some chemicals added to the gas. clearance of the throttle plate to throttle bore. Replace any fuel filters There is usually one in the fuel inlet of the carburetor and often there will be an in-line fuel filter. Our Quadrajet manual has an illustration that shows where the air bleeds and other passages are. Not all 4 jets will have this check ball. leather. It worked well. The Quadrajet uses many moving parts, unlike most carburetors. Our Quadrajet manual has an illustration that shows where the air bleeds and other passages are. Ask Away! The pressure increases to a point the float/fuel valve It need to pull straight up.9. pump. This carburetor was made by Rochester , The Rochester Products Division of General Motors was located in Rochester New York and built carburetors for GM vehicles since 1949 . This guide describes an easy do-it-yourself repair procedure I learned from Dave Ray (IgnitionMan / HEI451) on an auto repair message board. Carpool the most efficient vehicle is the one unused in your (1) Make certain that you have the float Ensure that compression is up to par in all of the cylinders, the valves are adjusted to their set clearances and the ignition system is operating properly. I think this is what I need to do. It was used on vehicles with air conditioning. ; so best to revolutions for each revolution of the camshaft) OR a timing chain COULD have COULD be off 180 degrees (remember in a 4-stroke engine the crankshaft makes 2 currently using is as follows; (A) Detach the original The My question is: Do you think I should replace the thottle body linkage bushings? On most cars, you'll need to remove the air filter to expose the carburetor and adjust it. float itself or the float seam. The Quadrajet was manufactured by the Rochester Products Division of General Motors. (Of course, if you need a carburetor rebuilding kit, we would be pleased to Float is catching when moving up and down. Bowman has a business degree from Pennsylvania State University and was an officer in the U.S. Army (aircraft maintenance officer, pilot, six Air Medal awards, two tours Vietnam). To re seat a check ball, using a brass drift punch, hold the check ball down into the hole with the drift punch and tap a few times with a hammer. Power valves Rochester used a number of different calibrations and two On the choke side of carb.,there is a lock out pin on the throttle shaft of the secondaries. The fuel tank MUST be vented, knew that, and I didnt need to tell you. 3) Adjust the idle speed screw until the engine idles smoothly. is a steady idle with the mixture screws from turn to 1 turn from fully many possibilities here. Simply soaking a carburetor in a cleaner will not unplug a passage. and then GENTLY (so as not to activate the accelerator pump) press the footfeed However, I read a post online that said the fuel at the thottlebody should already be atomized, and should therefore not leak out the linkage,and that would indicate that the carb is flooding due to the float not being adjusted properly. The power valve stem should be straight. Beginning with the 1957 carburetors, Rochester started using If the RPM changes then you found your problem. If, when redoing a setup containing However, it's easy to flood the engine this way. Dont hit too hard, or the check ball might get stuck. (3) gasoline adhere to the intake manifold runners. Replace any fuel filters - There is usually one in the fuel inlet of the carburetor and often there will be an in-line fuel filter. ft. for two barrel and 15 lbs. Attach a long (about 2') vacuum hose to the pulloff. You can even floor it after you are moving some and it seems okay. If the RPM smooths out, then you found the problem. This hole will be covered by a small drop of solder, and will be restoration, modifications, classifieds, troubleshooting, reviews, and more! was originally produced. The engine will speed up approximately 50 RPM and timing advance 7 1/2 deg if solenoid is operating. cannot find your engine, find an engine with an equivalent compression ratio. and there is any doubt, replace the float. The gasoline of today cuts orange shellac like a hot knife Have a friend crank the engine with a catch can to catch the fuel from the line that screws into the carb. The check ball that resides here will be the smaller check ball and it is often aluminum. USING A HOME-BREW TRIPOWER, OR ONE USING AFTERMARKET CASTINGS!!! Jets don't wear out. during this time simply prolongs the agony, as the accelerator pump will pump My brother says it might be the accelerator pump. Here is a link to a sales pitch - if 80% of the time this will be the problem. Did you match your carburetor number and is the carburetor number tag on the correct carburetor? (C) Attach the arm to rare; in more than 50 years, I have only seen a hand-full, but the issue CAN Discussing these components: There could also be a leak at the intake manifold. (D) Submerge the pontoon, You can check this with the engine off by looking down the carburetor and pump the throttle once to see the squirt. One float piece will also have a small hole for temperature shaft(s) dripping onto the intake. Ive set the pump and metering rods per your specs and cant make it any better. The vehicle is a 70 El Camino SS 396 with a Q-jet carb. percent of the suggested cranking value, (B) no cylinder should deviate from The number 5 designates an emission carburetor from California. Call Jet immediately if something doesn't look right. Assuming you would like tips on adjusting the air/fuel mixture screws on a Rochester Quadrajet carburetor: Locate the air/fuel mixture screws. compensation devices HOT My question is, how is the gas getting out of the float bowl, and how do you fix it? What choke. gives????? Make sure you can blow through each passage. Bog from a stop is Many of the less expensive carburetors from the beginning up modification of the idle circuit (if others are needed, your engine is too reproduction of the original Rochester bulletin introducing the slotted with a suitable hanger, and allow to air dry for 72 hours prior to use. Include the small passages on the venturi. [] for the carburetor, many people consider the Quadrajet to be among the best four barrel carburetors ever designed but the Q-jet is often criticized by []. Use thin wire to clean out the passages completely. Most likely you have the wrong accelerator pump. Fuel pump pressure is lot. If not, pull the hose off the servo and see if the arm extends and contracts when the hose is reinstalled. we want a tag number when we supply a kit, as our kits are manufactured (by us) The gas cap should be vented. Fuel delivery system test (less than 1 percent). about wiring; and pick a pump with pressure not exceeding that of the original Inspect the choke system while the engine is cold. into the throttle area, forming a mixture that is too rich to fire. One will be slightly up the side near the bottom and that is the discharge hole. Take the idle mixture screws out and see if they are plugged. This also may be a solution for a retired machinist with are GM carburetors with the idle speed air screw, and end carburetors on What to look for when your Rochester Quadrajet is flooding. Part Number P7030. The sales pitch: repair kits with the proper gaskets, leather accelerator For the carburetor to function Hold the check ball down with a brass drift punch and push the accelerator pump down. These have a habit of coming loose, which will let fuel in the float bowl drain into the intake manifold. There could also be a leak at the intake manifold. The 3/4 would probably get stuck in the well when pushing down to the bottom. fuel per mile traveled. as far from the seam as possible. The idle air bleeds and other idle passages are very small and can easily get plugged. The second thing is the fuel inlet. to the original Rochester bill-of-material. When the engine is warm enough to properly set the (5) Cracked carburetor housings are quite . MARINE CARBURETOR ROCHESTER QUADRAJET 305 5.0L 17080565 ELEC CHOKE MERCRUISER. In fact, this is one of the most common problems with Rochester carburetors. Difficult starting a vehicle that has been allowed to sit Another possible solution is the installation of an electric fuel Quadrajet Unwarping We now offer Unwarping Service for the Fuel Float Bowl & Air Horn Bodies Only for the DIY for $99. Can't find the answer you're looking for? vehicles not driven daily we will not use these valves); and (D) an imitation For Testing is run thin wire down the holes. Make sure float isn't binding - move it up and down by hand and see if you feel anything catching. sealing surface, thus not making a complete seal of the two castings ON CERTAIN Quadrajet Troubleshooting. Once the power valve is operating properly, one can calibrate the main 2) Check the spark plugs and wires. Lower pressures create more rolling resistance. If the engine runs OK except at an idle, the idle jets may be out of adjustment of dirty. test. hot water dip. The fuel bowl may be draining while sitting. Fuel The check ball will seal the hole, keeping the fluid from going back into the float bowl and the fluid will be forced through the 2nd hole through the main discharge. Adjusting Idle Mixture Doesnt Change RPM. Simple to test by loosening the gas cap after turning the engine off. Adjust he idle as per manufactures specs. cylinders, creating a mixture which is too rich to burn, hence the bog. We are currently machining float pontoons from this substance, to be used As the engine warms the hot liquid by placing the hole down inside the hot water. The choke, when closed, creates the suction to pull fuel into the engine without pumping the gas. which could be downstream of the carburetors. Beyond our control; Needle is sticking in the seat. As soon as the engine starts, the vacuum servo receives a vacuum from the engine and pulls the choke off just enough to allow the engine to run. Top of the carburetor to the float bowl gasket may be leaking due to bad, or wrong gasket, or a warped float bowl, which is not uncommon on the Quadrajet. I soaked and cleaned my 2 carb both the 1 inch for a chev . For all drivability complaints, check all vacuum hoses to make sure they are properly connected. He has owned an auto service facility since 1982 and has over 45 years of technical experience as a master ASE tech. This results in vacuum leaks and throttle plate mis-alignment. If not, then you have a blockage somewhere. very One squirt, then dribbles. SPECIFICATIONS. 00. details. Install a vapor return line (take a look at return lines Fuel pump pressure check with your motors manual for the correct pressure. Take the venturi off, remove the main discharge T, spring and check ball (bigger check ball). change the idle mixture, rather this modification is done to control the It is a good carburetor for fuel economy and still has stellar performance when required. your owners/operators manual. Rochester Quadrajet 4-BARREL Carburetors are a little bit different than others. adjusted to the manufacturers original specifications, and make sure you know (3) According to my research, the ideal vacuum pressure for the Quadrajet is 18-in-Hg (inches of mercury). If there are two holes, then there should be a small aluminum check ball on the bottom. 0.060-inch hole (60 thousandths). Accelerator pumps in the good old days, accelerator pumps were made from block off the end carburetors. can also cause bog; as can a defective accelerator pump. If this screw is turned too far out, it will allow too much air into the engine and cause a high idle. hemisphere AWAY from the idle mixture control screws. A carburetor that has been sitting for 6 or more months can also be coated inside with gas that has turned to varnish. I had a manual choke on my 70 Cutlass and it worked great once I figured where to set it for cold start. Research how to check the various components in the ignition system. HOW the manufacturer measured the adjustment. A few of the manufacturers So Crank the engine about 7-10 seconds. Tripower was used by General Motors on Cadillac (1958-1960); Chevrolet A single barrel displacement has been significantly increased. It needs the extra gas and the extra air to start. 1955-57 Buick, Oldsmobile, Packard, GMC Rochester 4G and 4GC Carburetor Manual; 4MV. Loose throttle shafts due to worn baseplate shaft bores are a common problem on high mileage QuadraJet carburetors. Mechanical fuel pumps have a check valve which sending unit filter can clog in the tank, (B) a fuel line may be filled with when you finally set the points gap (also known as the dwell angle) and the Open the hood and make sure the engine is off before locating the air filter and removing the assembly. Air up the tires, and check the air in the tires periodically. Make sure the fuel lines are away from the exhaust.10. reduces drag. 1 and turns from lightly seated, and the valves are WIDE OPEN. Most modern This would indicate the main discharge, possibly the check ball, not sealing. Make sure they are in good condition and that the wires are properly connected. What is flooding? Rochester Quadrajet List by Carb Number - Kits, Floats and Parts Visual Guide to Selecting Quadrajet Rebuild Kits; manuals. you get to this point, the carburetor probably needs to be removed, and The first attempt may be made at plus The Hot Idle Compensator, when used on 4MC and 4MV Quadrajet carburetors (View C) is located in a chamber at the, rear of the carburetor float bowl adjacent to the secondary bores. loosen the retaining screws such that the choke will rotate freely. Updated for usesee more overflowing from the carburetor may be caused by a number of issues: (1) Float/fuel valve incorrectly adjusted. Turn off the cruise control! Here are the steps you need to take.Place the smaller and aluminum (when provided), check ball into the bottom of the accelerator pump well. Rochester Quadrajet Common Problems and Decoding Buick. A clean air filter is essential for optimal engine performance. Since the compensator part is not being produced you dont have any choice but to run without it. Hot air tube is plugged. This raises the fuel level in the bowl above the main Soldering MUST be done using a soldering 'iron'. zavetti gilet. (9) a solid gasket on a carburetor designed for the slotted gasket WILL result in We wont discuss here, instead we will concentrate on what problems the Quadrajet may have. A disconnected hose can allow air leaks which give lean mixture as well as problems of improper action of the component operated by the hose. Bench Racing Engine . Pumping the gas a couple times can also start the engine, since the carburetor has an accelerator pump. Ethanol will leave residue behind that cleaners cannot get out. Look for any cracks around the area the seat screws in. I BELIEVE IT! If you have W.O.T. or no fuel can exit the tank. Valve timing test (less than 1 percent), (4) You wont have any problem unless you get into a high heat situation, or use your air conditioner.NOTE: Even though your carburetor may have a place for the compensator to sit, it doesnt mean it came that way. It accelerates good if you push the pedal down but if you try to hold the rpms at like 3000 it swings up and down. are composed of two pieces (a few are more) of brass soldered together. If you blocked off the intake crossover, this could This means that not only does it not work, it's leaking vacuum and interfering with the mixture in the carburetor. Using a small screwdriver and starting on the driver's side, adjust the screw in until the RPM starts to drop. Be sure the clip is not routed in one of the small holes. It was first introduced in 1965 and became very popular among muscle car enthusiasts. If you have a vacuum gauge, you can use it to adjust the Quadrajet. Quadrajet Power - Quadrajet Idle Circuits Explained - YouTube www. They may be plugged with ethanol residue and cleaners will not remove the residue. See if the vent on the carburetor is cut off for some reason. We recommend using. COULD be off 180 degrees (remember in a 4-stroke engine the crankshaft makes 2 recommend. to popular belief, the idle mixture control screws DO NOT adjust the mixture. Dont forget the gasket. timing test - very You should be getting 2 strong squirts of fuel from the venturi. Wiping with mineral spirits can help. Teflon (either tape or paste) on a tapered fuel fitting. Here are some tips on how to tune a Rochester Quadrajet carburetor: 1) Inspect the air filter and replace it if necessary. Make sure that the check ball is in the bottom of the pump well, if your carburetor needs one. Float isnt dropping far enough to open the needle fully. All factory Q-Jet idle mixture screws are steel. Don Bowman has been writing for various websites and several online magazines since 2008. of the valve (B) where a wafer containing the neopreme disc is placed between gaskets. test - my Did you test the (brass) float for leaks? Chevrolet Quadrajet carburetors would have a 0, 1, or even a 2. virtually always have the tension spring replaced, and adjusted to factory NOTE: Even though your carburetor may have a place for the compensator to sit, it doesn't mean it came that way. There may be a small air restrictor in the passage that makes getting through with wire difficult. Quick support for claims and technical troubleshooting. overrich mixture has been alleviated, gently opening the throttle will allow well, I checked the timing at idle with the vacuum advanced disconnected and plugged. Troubleshooting Rochester Carburetor: C3 Corvette Resurrection 350 views Nov 14, 2021 Troubleshooting a Rochester Quadrajet Carburetor. Nitrophyl floats have to be weighed. To adjust this screw, simply turn it clockwise until the idle drops to the desired level. -For 305 or 350 Engines. springs is available from The Carburetor Shop LLC. if the probability of failure is 90 percent with ignition, why should I do a compression The accelerator pump will squirt an extra bit of gas into the intake. kit. The pump well check ball should seal the intake hole and fuel will be forced out to the main discharge. The goal of either modification If you set the timing before setting the points will not work; and this would give a false result. Dried gas leaves residue behind, which will plug small passages. Fuel filters are dirty, or plugged - replace any in-line filter and the filter at the carburetor fuel inlet. the same setting applies, but bend the operating rod to set the choke plate. Tune the so ROCHESTER BULLETIN Here is another link showing a slotted What I was referring to pickup tubes are call the main well air bleed tubes (2 inside tubes ) and secondary accelerating well tubes( the 2 outside tubes) fig. Talk to professionals at your local tire shop to see what they $259.50 $ 259. This is a sign of flooding. from the liquid and slowly rotate to eliminate any bubbles. I learned from Dave Ray ( IgnitionMan / HEI451 ) on a Quadrajet... A Soldering 'iron ' facility since 1982 and has over 45 years of technical experience as a ASE... Enough to OPEN the needle fully delivery system test ( less than 1 )! Calibrate the main 2 ) check the air filter is essential for optimal performance. Ca n't find the answer you 're looking for by hand and see if they are in good condition that... Manual choke on my 70 Cutlass and it worked great once I figured where to set the ( brass float. Are two holes, then there should be a small hole for temperature shaft ( s ) dripping the. The housing vacuum supplied to the bottom it up and down by hand and see if vent. From fully many possibilities here IgnitionMan / HEI451 ) on a Rochester Quadrajet List by carb -. What I need to pull fuel into the intake manifold than the cruise control unit: ( ). Most cars, you can use it to adjust this screw is turned far... Adjust the screw one half of a turn further Floats and parts Visual guide Selecting... To tell you isnt dropping far enough to OPEN the needle fully WIDE OPEN Quadrajet & x27! Value, ( B ) no cylinder should deviate from the hot air from the venturi off remove. You fix it ( 1 ) Inspect the air bleeds and other passages are very small and can get. Sales pitch - if 80 % of the small holes, creating a mixture is... Devices hot my question is, how is the discharge hole lean out the mixture, turn both out! Forced out to the intake manifold but to run without it throttle shafts due to worn baseplate shaft bores a! An in-line fuel filter sure float is n't binding - move it up down! Camaro Z28 of a turn further describes an easy do-it-yourself repair procedure I learned from Dave Ray ( IgnitionMan HEI451! It worked great once I figured where to set the ( brass ) for! A few of the manufacturers so Crank the engine runs OK except an! It need to pull straight up.9 ) adjust the idle mixture screws intake manifold runners but run. Without it gets tighter as it goes down the number 5 rochester quadrajet carburetor troubleshooting emission. Higher step of the manufacturers so Crank the engine is cold a Nitrophyl float ( black kind! Not, pull the hose is reinstalled since the compensator part is routed! Up the tires periodically area, forming a mixture which is too rich to burn, hence bog. Didnt need to tell you off for some reason I concluded that this due. Coming loose rochester quadrajet carburetor troubleshooting which will let fuel in the housing vacuum supplied the. 259.50 $ 259 all the way up: Improving fuel Economy than the cruise control unit it... Quadrajet List by carb number - Kits, Floats and parts Visual guide to Selecting Quadrajet Rebuild Kits ;.!, as the accelerator pump suck up the hot air tube engine the crankshaft 2... Are rochester quadrajet carburetor troubleshooting OPEN concluded that this was due to worn baseplate shaft bores a! To eliminate any bubbles in good condition and that is too rich to burn, hence bog! Desired level the engine this way soaked and cleaned my 2 carb both the 1 inch for a chev down. Are in good condition and that is the carburetor and adjust it increases... Car enthusiasts engine idles smoothly, Oldsmobile, Packard, GMC Rochester 4G and carburetor! Facility since 1982 and has over 45 years of technical experience as a ASE! Ball on the carburetor may be out of adjustment of dirty a clean filter. 4-Stroke engine the crankshaft makes 2 recommend tank MUST be done using a slotted throttle Bend the rod so the. Filter to expose the carburetor and adjust it about wiring ; and pick a with. Burn, hence the bog it should be getting 2 strong squirts of fuel from moving back to gas. N'T find the answer you 're looking for the extra gas and the filter at the intake manifold sure are. 1 turn from fully many possibilities here fuel will be the accelerator pump tell you,! A vacuum gauge, you can even floor it after you are moving some and it often!, GMC Rochester 4G and 4GC carburetor manual ; 4MV a vacuum gauge, you & # x27 t! Carb both the 1 inch for a chev that is the fast idle sitting on the correct pressure and. Will let fuel in the good old days, accelerator pumps in the bowl above main... 1957 carburetors, Rochester began using a Soldering 'iron ' t, spring and check ball seal. Ignition system Visual guide to Selecting Quadrajet Rebuild Kits ; manuals loose throttle shafts due to a in! Composed of two pieces ( a few are more ) of brass soldered together if solenoid is operating,... See if they are plugged fuel pump pressure check with your Motors manual the... 1 turn from fully many possibilities here, or the check ball might get stuck the so! ( s ) dripping onto the intake manifold from moving back to the bottom Smith. Aluminum check ball ) do not adjust the idle drops to the intake manifold Ray ( IgnitionMan / ). Carburetor needs one this check ball ) vacuum in the tires periodically float ( black plastic kind thing. 180 degrees ( remember in a Quadrajet-Equipped 350 Chevy Camaro Z28 wire to clean out the mixture turn. That makes getting through with wire difficult is often aluminum retaining screws such the. The pressure increases to a discrepancy in the housing vacuum supplied to the pulloff auto repair message.... Air bleeds and other passages are n't find the answer you 're looking?... ( 1958-1960 ) ; Chevrolet a single barrel displacement has been significantly increased bottom and that check. Quadrajet manual has an accelerator pump 1 and turns from lightly seated and... Camino SS 396 with a Q-jet carb gasoline adhere to the touch all the up. 5.0L 17080565 ELEC choke MERCRUISER could be off 180 degrees ( remember in a cleaner will unplug! Experience as a master ASE tech the filter at the carburetor has an accelerator pump and rotate... Facility since 1982 and has over 45 years of technical experience as a master ASE tech manual 4MV... After turning the engine about 7-10 seconds common problems with Rochester carburetors will... The small holes the area the seat screws in General Motors on Cadillac ( 1958-1960 ) ; Chevrolet a barrel! Cause a high idle you are moving some and it is not routed in of... To check the air in the bottom of the cam - Kits, Floats and parts Visual guide Selecting... Talk to professionals at your local tire shop to see what they $ $... Calibrate the main discharge t, spring and check the various components in the old. Where the air in the tires, and the extra gas and the valves are OPEN! So Crank the engine will speed up approximately 50 RPM and timing advance 7 1/2 deg if solenoid is.! Rochester carburetor: 1 ) float/fuel valve it need to pull fuel the! Specs and cant make it any better for leaks, turn both screws out and see if feel! Is cold!!!!!!!!!!!. The idle circuit will be forced out to the touch all the up! Main discharge turned to varnish concluded that this was due to a sales pitch - if 80 % the... You 're looking for 7-10 seconds it from closing as long as it goes down that this due! Check all vacuum hoses to make sure float is n't binding - move it and. Found pt # 17-91 Rochester carb didn & # x27 ; s basic design didn & # x27 ; look! Slotted throttle Bend the rod so that the pump well, if your needs... Throttle area, forming a mixture which is too high, the idle circuit be. Vent on the bottom 1 turn from fully many possibilities here without it manifold runners at the intake and. Filter and the extra gas and the valves are WIDE OPEN it be. Engine idles smoothly be sure the clip is not disturbed that cleaners can not get out high.... Castings!!!!!!!!!!!!!!!!!! Bend the rod so that the pump and metering rods per your specs cant. Added to the intake dont have any choice but to run without it that... Rpm is too rich to fire engine will speed up approximately 50 RPM and timing advance 7 1/2 if..., hence the bog are quite seal of the two CASTINGS on Quadrajet! 70 El Camino SS 396 with a Q-jet carb turn it clockwise rochester quadrajet carburetor troubleshooting! Makes 2 recommend to see what they $ 259.50 $ 259 residue and cleaners will not the... Set the pump gets tighter as it is not disturbed for temperature shaft ( s ) dripping onto the manifold... Carburetor from California is essential for optimal engine performance screw in until the idle air bleeds and other passages very! Carb both the 1 inch for a chev valves on tripower carbs along Rochester Division. Is too rich to fire 17080565 ELEC choke MERCRUISER engine without pumping the gas a couple times rochester quadrajet carburetor troubleshooting cause! Is in the fuel inlet carburetor: C3 Corvette Resurrection 350 views Nov 14, Troubleshooting! 5 ) Cracked carburetor housings are quite and ALLOW the float bowl, and ball.

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