Question about 2000 Chevrolet 3500

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Engine backfire when decelerating

Engine backfires when i let off the throttle and begin to slow down. it is a standard transmission. when i push in the clutch it doesnt but sometimes dies. it does the backfire thing especially when towing trailer and using the engine to slow me down.

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  • rustylove Mar 08, 2009

    yes both are new

  • rustylove Mar 09, 2009

    new plugs new wires, new cap and rotor, new coil and ignition module. no exhaust work and cats are good... replaced fuel filter when i replaced fuel pump about a month ago. its a 7.4 litre 454. standard transmission.

  • rustylove Mar 11, 2009

    having much more serious problems now any way. cant accelerate, bogs out. i posted it seperately when i did this one. anyway engine is a 454. and yes cats were cleared out when i got it. there is no high idle but i will check compression. might be fixin to pull whole thing if it keeps it up like it is . replaced plugs wires cap rotor coil and ign module in past few days . it has not gotten even a little better. thank you for your suggestions if you can think up anything else to try im all ears

  • rustylove Mar 13, 2009

    well i feel pretty silly at this point. pinched fuel line at tank. i guess when i put pump in a few weeks i wasnt careful when i put tank back up. thank you very much for taking the time to help with my problem. i guess you should always check last repair before assuming that every thing went right and it has to be something else



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Did you check spark plugs and wires? this would be the first step

Posted on Mar 08, 2009

  • 4 more comments 
  • josh1111 Mar 08, 2009

    any exhaust work done recently?

  • josh1111 Mar 08, 2009

    what size engine?

  • josh1111 Mar 09, 2009

    check timing , airflow sensor, did you remove cat converter? , sounds like exhaust leak, whats the mileage replace fuel filter

  • josh1111 Mar 09, 2009

    hmm i would next get the engine compression tested, may be a bigger problem, its a throw up at this point between compression and clutch problems. since im not fimilar with the internal operations of this clutch , i can only say to check compression. mabey take to a mechanics and check out the clutch operations. if it has a high idle it may be cltuch.

  • josh1111 Mar 12, 2009

    computer check? maf sensor?

  • josh1111 Mar 13, 2009

    hey im telling you the hardest problems to fix are the ones caused by people working on a machine and they dont even realize it. i always go back over my work when im running into trouble. The first question you should ask people on this site, "what have you done so far to try and fix this problem?"



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The backfiring on deceleration is typically associated with a loose timing chain.

If you put a wrench on the harmonic balancer bolt, turn the balancer gently until you feel the chain tighten, then rotate the opposite way until it tightens, how far does is move.
If it goes more than an inch, it is getting sloppy. If it moves closer to 2 inches, it is worn out.
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