Question about 1997 Chevrolet C1500

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Engine surges I have a 97 silverado with the 5.7 sfi, replaced fuel filter and put fuel injector cleaner init. at acceleration it hesitates and seems to be running rich, no codes are in the computer. it seems to idle all right just no power when in gear.

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  • matthewstron May 21, 2009

    i checked everything out, every things seems to be good. could it be a cat or a timing chain problem, the truck has 200000 miles on it.

  • matthewstron May 21, 2009

    it has also been back firing when shifting from drive into reverse.

  • matthewstron May 24, 2009

    installed an new timing chain, still need to run timing light on it, but it runs alot better, still alittle hesitation when accellerating. thanks for the help

  • matthewstron May 29, 2009

    ok, i have more problems, i had to reinstall the timing chain, now the engine has a knocking sound that only knocks every so often. i have checked the the puch rods and everything is fine. its not knocking all the time just every once in awhile. when ever i give it gas it gets worse. im lost and dont know what to do anymore. please help

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I had this same problem with my silverado, it ended up being the fule injectors where dirty. I took them out and cleaned them. It is a project so if your not up to then you can take your injectors and have it done for $30-40.

Posted on May 19, 2009

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HI, i recommend inspecting the following--

Inspect the hose at the PCV valve. this hose could be clogged or it may have collapsed.

Inspect the PCV valve as well. it may be plugged or damaged.

Inspect all fuel injectors and there operational value. this may be the issue. Your injection system may be faulty or the timing could be off. inspect thoroughly.

Inspect the plugs and wires. you may have fouled, damaged or, broken spark plugs. check each individual plug and wire for damage.

Inspect the Throttle position sensor. this sensor may be malfunctioning.

Inspect or replace the fuel pump. this is another known cause of surging and hesitation.

Please take the time to inspect all area thoroughly.


Posted on May 19, 2009

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  • Michael Masters
    Michael Masters May 21, 2009

    OK, the back firing during shifts will confirm timing issues. the timing chain may be stretched and it could have jumped a sprocket, causing a shift in the valve timing.

  • Michael Masters
    Michael Masters May 21, 2009

    Now that you have mentioned the mileage on this truck, it make perfect since to be a timing chain issue. im sure its stretched and may have jumped timing. this can throw off the valves big time, causing this backfire.

  • Michael Masters
    Michael Masters May 21, 2009

    I doubt if its a O2. you would get a code for that.

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