Question about 1985 Chevrolet C1500

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Popping up thru the carb

Changed ythe distributor  timing is in check with the advance un hooked changed the fuel pump new plug and wires as well valves seem to be ok im at my wits end with this please help me

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  • Mark Paxton
    Mark Paxton Dec 30, 2008

    also when i ran a fuel pressure test i get a major flux on the gauge 

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  • 140 Answers

If it's a mechanical pump that's normal.

Posted on Dec 30, 2008

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Have a 73-74 366 that has a aftermarket carter afb carb and it is popping through the carb while cranking and will not stay running. Have done a compression test-normal, changed cap and coil, checked...


Usually there are three reasons for backfiring thru the carb.
Not enough fuel, spark timing too early, or an open intake valve.
If the compression is good on all cylinders as you stated, my guess would be spark timing or mixture too lean. Could be a large vac leak somewhere too.
You say you checked the ignition, but do you know for a fact the plugs are all firing at the right time ? You could pull each plug wire and check each cylinder one at a time. Did you change the rotor when you changed the cap, and is there any chance the wires are cross-firing ?

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Ok first question. Did you install an AC Delco fuel pump? If not, change the pump. Other pumps do not maintain the pressure that is required by the system. You say you have installed a new disturber, insure you are time installed correctly. Rough running usually is a vacuum leak, usually you can find it by spraying cab. cleaner around the intake manifold and components. Hope it helps

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The engine pops through the carb when i give it gas. Why does it do that?


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Hi im working on a 92 volvo 740 with the 2.3 non turbo. the problem is i just did a motor swap the old one had "hard knocking " drove car in ran fine but loud. did the swap- while it was on the...


NEED ADJUST SET IGNITION TIMING.MOST TIME YOU INSTALL ANOTHER NEW ENGINE.THE IGNITION TIMING AT DISTRIBUTOR OFF TIME LITTLE TOO FAR ADVANCE CAUSING WEAK SPARKS FOULING OUT SPARK PLUGS. CHECK FUEL PRESSURE SOON AS ENGINE STOP AGAIN DONT TURN ON IGNITION SWITCH CHECK FUEL PRESSURE.SHOULD BE 43 PSI. IF NOT 0 FUEL PUMP BAD OR FUEL PUMP RELAY FAULTY OR FUEL FILTER STOPPED UP.IF FUEL SYSTEM GOOD PROBLEM IN THE IGNITION TIMING.

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89 accord dx starts and idles fine but hesitates


check ur timing -
MARK with a scratch tool or use a yellow majiuc marker to see where the timing is now then-

loosen the distributor bolts - if you have a distributor on that model and - turn the distributor one way - then the other and see if it improves. You can slightly tighten the bolts or carry a wrench with you and drive the car and see if a new position improves the running of the car.
Also - change the plugs if you haven't done so - check them to see how they look anyway.
You may have a flooding condition on your hands as well but that is a whole new thing - so stick with timing and plugs -

hope this helps
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Popping sound in carb when i throttle it up


sounds like you may have a cam lobe gone flat

Dec 30, 2008 | 1985 Chevrolet C1500

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