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  • 3 Post By rspears
  • 2 Post By shine
  • 3 Post By cffisher
  • 2 Post By 34_40

Thread: surging engine
          
   
   

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  1. #1
    cffisher's Avatar
    cffisher is offline CHR Member Visit my Photo Gallery
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    Car Year, Make, Model: 57 chevy 2 dr wagon
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    surging engine

     



    my 91 Chevy 5.7 throttle it body has developed a surging I'm not sure what's going on I start it and it will run from 600 to maybe 2000 rpm just up and down. I haven't looked at it yet I just took a different ride to store. It acts like a vacuum leak, but that would stay all the time. You can rev it up and it runs but at idle its all over the place. Any ideas before I start this venture?
    Charlie
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  2. #2
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    rspears is offline CHR Member/Contributor Visit my Photo Gallery
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    Sounds like your Idle Air Controller (IAC) is bad to me, or perhaps it's unhooked. I guess it might be the Throttle Position Sensor too, but I'd start by looking at the IAC.
    glennsexton, 34_40 and 36 sedan like this.
    Roger
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  3. #3
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    get a can of tb cleaner and rinse the iac good. they get nasty from crankcase fumes.
    NTFDAY and 36 sedan like this.

  4. #4
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    Thanks guys I changed the TPS as I had one. While doing that I found the EGR valve was rusted away the stem was all that was connected no spring Changed that. Idle is a bit high but no more surging. Bought this truck about 10 years ago and use it for plowing the drive way and hauling wood. I changed the front pad and the clutch. I figured if it runs why worry about it . Guess I'll treat it to a tune up now so it's good for this winter.
    ted dehaan, NTFDAY and 36 sedan like this.
    Charlie
    Lovin' what I do and doing what I love
    Some guys can fix broken NO ONE can fix STUPID
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    http://fishertrains94.webs.com/
    Christian in training

  5. #5
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    You may have to adjust the TPS for low idle. Need a volt/ohm meter. And the service manual to tell you the value it needs to be set at, if the minimum setting is a bit high, it'll hold the low idle at a higher speed than needed.
    cffisher and 36 sedan like this.

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