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Poor running 350.

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Chewy, Oct 24, 2000.

  1. Chewy

    Chewy 1/2 ton status

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    Ok here's the problem: The engine, a 1988 350 TBI, starts and idles fine. If you rev the engine up while in neutral or park, there are no problems. However, when in gear and I try to rev the engine up, it boggs down to a point where it is not developing any power. I have tried cleaning the fuel injectors, cleaning the throttle body, the O2 sensor is brand new, and the spark plugs all check out OK. Please Help!

    [​IMG] '87 Beast
    Colorado, USA
     
  2. Mike87

    Mike87 Registered Member

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    Check your catalytic converter....I bet it is plugged.

    Good Luck,
    Mike (#87)
     
  3. Stoopalini

    Stoopalini 1/2 ton status

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    could be the Cat ... I would check that 1st. But if that's a nogo, check your fuel pressure. I had an '87/'88 Jimmy with the 350/TBI that started doing that and I ended up replacing the fuel pump to correct it.

    When I replaced the fuel pump, I took the opportunity to cut an access panel in the floor so if I ever had to change it again, I wouldn't have to drop the tank. Something to think about if you end up dropping the tank to change it out.

    Thomas.

    -- '84 K5 Blazer --
    http://stoopalini.coloradok5.com/index.html
     
  4. Thunder

    Thunder 3/4 ton status

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    Do the easist first. Change the fuel filter!
     
  5. DMK

    DMK 1/2 ton status

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    I would also say fuel problem. Replace fuel filter. Are you getting any trouble codes?
     
  6. dumbfounded

    dumbfounded 1/2 ton status

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    You can check to see if the cat is working by holding your hand by the tail pipe while some one revs the motor. It should push plenty of air, and at an idle it should pulsate. I had a cat go on me years ago in a car and it would idle fine and go wide open but nothing in between, but it sounds like a fuel filter to me....

    Love, Peace, and Hair Grease...........
     

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