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1990 blazer idle problems

Discussion in 'The Garage' started by santiago, Jun 16, 2005.

  1. santiago

    santiago Newbie

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    ok fellas i have a rough idle and surge i have already replaced plugs,wires,cap,mass air flow sensor,tps sensor,air idler valve,throttle body gasket,o2 sensor,air filter and i cleaned out the egr valve any advise would be a blessing thanks in advance :confused:
     
  2. Kiqman

    Kiqman 1/2 ton status

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    Rough idle and surge

    Looked at your fuel pump? Making enough pressure? Had a problem like yours and it turned out to be the in-tank pump. Just cut a hole above the tank in your bed to access the top of the tank. Beats pulling the tank out. You can test pressure at the TBI. Good luck.
     
  3. dyeager535

    dyeager535 1 ton status Premium Member

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    Ever get any codes?
     
  4. sweetk30

    sweetk30 professional hooker Premium Member

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    first. what kind of blazer? s10 or full size. next what plugs for tune up? and last what motor.?
     
  5. who would do that
     
  6. pvfjr

    pvfjr 1/2 ton status

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    Who would cut the hole in the floor?.....Lot's of people. You'd be surprised.
     
  7. jekquistk5

    jekquistk5 Weld nekid Premium Member GMOTM Winner

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    Check your EGR Solinoid. And check for vacuum leaks
     
  8. icer97

    icer97 1/2 ton status

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    Sure sounds like vacume to me. Take a can of carb cleaner and spray all around. Could be a intake gasket leaking internally, ive found these by removing the oil fill plug on the valve cover and giving her a snort of carb cleaner.
     
  9. REDCRO_REDNECK

    REDCRO_REDNECK 1/2 ton status

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    no body should if they have a short bed then you have a hole in your bed for nothing. The sender is under the cab (1987 shortbed).
     
  10. Kiqman

    Kiqman 1/2 ton status

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    I've enjoyed the easy access a "trap-door" above the fuel tank provides. I wouldn't do it to a new rig but in my 89 it was a no-brainer. Just fabbed up a little hinge setup and seal. Once you throw the sound proofing and carpet back down you don't know it's there even standing on top of it. Lazy...yes but I've never heard anyone brag about the cargo capacity of their K5 anyway and taking those tanks out sucks. More time for mud and beer! :cool1:
     
  11. Tracktor

    Tracktor Registered Member

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    I know you've replaced the wires already, but I just went through this problem and thought I'd post my fix. It was a shorting plug wire. The cap was crocked at the plug and shorting on the heat shield. Wires were otherwise in great shape, but the heat had dried the caps out. ................
     

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