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TBI stumble

Discussion in 'The Injection Section' started by Citizen Rider, Jun 17, 2006.

  1. Citizen Rider

    Citizen Rider 1/2 ton status

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    I have a 95 Chevy silverado 4.3 V6 TBI.
    Lately taking off from a stop within a couple seconds of pressing on the gas, it will stumble, i guess you would call it. Basicly its like the engine stops, i hear a puff of air that seems to come from the throttle body. And then keeps right on chuggin. Just jars your forward some, and then it picks itself right back up.

    When it first started it would only happen once. Traveling about 70mph it will also stumble doing the same "stop and go".

    Ive changed the oil, Fuel filter, fuel pump is 3yrs old, injectors spray mist still (One has a very very slight drip to it, but would that cause this?)

    Im lost and Check engine light has not come on. :confused:
     
  2. ryoken

    ryoken Puppy Fabricator Premium Member GMOTM Winner

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    Sounds like your EGR is taking a cr*p....
     
  3. Cricket

    Cricket 3/4 ton status

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    According to the manual:

    1. Ignition timing incorrect
    2. Ignition system not operating properly
    3. Dirty or clogged fuel injectors
    4. Low fuel pressure - check fuel pump operation, fuel filter and/or lines.
     
  4. Citizen Rider

    Citizen Rider 1/2 ton status

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    hmm, anyway to check EGR??

    Fuel filter replaced today, injector has a very tiny drip, barely noticible.

    Timing could be possible, but i dont have a way to check. hmm
     
  5. Cricket

    Cricket 3/4 ton status

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    Manual: pre 96 test. Push on the EGR valve diaphram with moderate pressure. You should be able to move it in & out within the housing. If it doesn't move or moves with much effort replace the valve with a new one.

    Personally I think that's a bit misleading and simplistic. It could be a bad hose, vac leak, stuck pintle, ecm, egr solenoid, et in the EGR system.
     

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