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bogging down and running real rich

Discussion in 'The Garage' started by chvymudin3388, Jan 22, 2007.

  1. chvymudin3388

    chvymudin3388 1/2 ton status

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    what could be causing this? its got new cap, coil, rotor, and pick up coil.
     
  2. longbedder

    longbedder 1/2 ton status Premium Member

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    Is it carbed or injected? If the former, what kind of carb?

    Check your float level.
     
  3. chvymudin3388

    chvymudin3388 1/2 ton status

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    its tbi 87
     
  4. longbedder

    longbedder 1/2 ton status Premium Member

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    Reset the ECM (disconnect power for a while), then see if it's throwing any codes while running. If it's as bad as you say, then it should be.

    Could be an O2 sensor, bad coolant temp sensor, etc.
     
  5. chvymudin3388

    chvymudin3388 1/2 ton status

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    well its not the O2 sensor and im trying te TPS next
     
  6. vortec

    vortec 1/2 ton status

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    if O2 is fine, backprobe the tps through its full range of motion, checking for unusual readings, like voltage spikes, flat spots, or out-of-range message. then, make sure the MAP sensor has all of it's tubes and wires connected. if that's fine, i'd check the IAC and make sure that the piston moves freely. those aren't the only things to check, but they're easy.
     
  7. chvymudin3388

    chvymudin3388 1/2 ton status

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    where is the MAP sensor anyway im not very familiar where everything is i am with most things
     
  8. vortec

    vortec 1/2 ton status

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    pop the air cleaner off, and look at the manifold area. the MAP is generally (from what i've seen on gm trucks) located on the passenger side of the intake manifold, on a bracket, several inches from the throttle body. it's a small box, only a few inches long, and should have wires and vac tubes running to it.

    i had a hose slip loose, a few years ago, and it ran pretty rough. replaced it with fuel line since it was getting crusty anyway.
     
  9. chvymudin3388

    chvymudin3388 1/2 ton status

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    well try it but please keep the suggestions coming
     
  10. Aquaholic

    Aquaholic Registered Member

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    I have an 87 and am having the same problem. Have you had any luck?
     
  11. chvymudin3388

    chvymudin3388 1/2 ton status

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    well i just found out my problem my freshly rebuilt 3,000 mile motor has real bad blow by issues and is dumping oil into the tbi from the breather tubes runningt o the tbi from teh valve covers
     

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