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  1. #1

    Default new to me chevy truck

    Hey guys I just bought a 88 chevy cheyenne, long bed ext cab with 5.7. She hesitates off idle but once I get moving she is fine. So I just had a fuel pump and fuel pressure regulator replaced, she sat for 2 yrs prior to me buying her. So any ideas on what is causing the hesitation?

  2. #2

    Default

    Did you replace the plugs and wires? Also IIRC the PCV on those older engines were user replaceable.

  3. #3

    Default

    Quote Originally Posted by stchman View Post
    Did you replace the plugs and wires? Also IIRC the PCV on those older engines were user replaceable.
    the mechanic who replaced the pump and reg pulled the plugs and inspected them and the wires, I was told they were good to go... Where else could I look?

  4. #4

    Default

    Quote Originally Posted by whatelseisleft View Post
    the mechanic who replaced the pump and reg pulled the plugs and inspected them and the wires, I was told they were good to go... Where else could I look?
    It's easy to do a visual inspection on spark plugs, but if the wires are original, replace them.

  5. #5

    Default

    Did you replace the fuel filter and clean out the injector(s) as well? Anywhere that old gas could have sat in the system over time could result in it gumming up and at least partially blocking delivery.

    Any funny smells coming out of the exhaust? Damaged (or mice nesting inside) exhaust, could result in hesitations as well.

  6. #6

    Default

    plug wires were replaced about 10k before it was parked... exhaust does smell kinda funny to me but I don't think there is a nest of any sort in there... the exhaust smells kinda rich to me... the exhaust does not appear to be damaged at all...

    the fuel filter was not replaced nor were the injectors cleaned, I plan to changed the filter this week... recommendations on cleaning the injectors?

  7. #7

    Default

    Inside of the cat could be corroded, or you could be burning (or sending through the cat) some bad gas that was left in the truck. Was the tank flushed and cleaned when you replaced the fuel pump?

    As for cleaning the injectors, http://www.fd3s.net/injector_cleaning.html might provide you with some helpful information. A good mechanic shop or dealer service should be able to clean them properly for you, if you can't do it yourself or don't trust yourself to do it.

  8. #8

    Default

    Remove all the fuel from the fuel tank and check it for water. If it sat, you have water in there guaranteed. Even if it does not sit you have water in there, even if it didn't use fuel with ethanol in it. Don't try to make this too complicated.
    1994 Chevy K2500 Silverado, 454 (modified), original owner.
    And other vehicles and toys.

    "...If you can meet with triumph and disaster
    And treat those two imposters just the same;
    ...you'll be a Man, my son!" Rudyard Kipling

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