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Erratic Idling After Swap

Discussion in 'General Tech and Maintenance' started by ScandalousImage, Jan 23, 2003.

  1. ScandalousImage

    ScandalousImage Junior Member

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    I put a b18c1 engine (obd1) into my '94 Civic Si, when the engine was installed, there was a bad oxygen sensor which triggered the check engine light, I got that fixed, but the car still idles erraticly, here's a description:

    When I start it up, it revs to about 3800 rpm, then it drops back down to 1500 rpm, then kicks back up to about 3500 rpm, then goes back and forth between those 2 engine speeds.

    My first guess was a vacuum problem, I took it to a shop, they did a vacuum test and said the vacuum was good.

    Any help would be appreciated
     
  2. SolReaver

    SolReaver Senior Member

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    check tps voltage and iac valve
     
  3. sisteve

    sisteve Guest


    exactly

    I bet its the IAC Valve that has a lot of soot on it, get some simple green and an old toothbrush and clean the soot off the screens and you should be golden
     
  4. tomtom

    tomtom Senior Member

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    u took it to a shop and they didn t even tell u what they think?
    didn t they at least try to sell u an idle adjustment and throttle body clean?
    how about fuel filter?

    i wonder how people make money.....................
     
  5. ScandalousImage

    ScandalousImage Junior Member

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    I had the swap done while i was home from college on winter break, I had to drive to college with fucked up idle, the guys in the podunk town where I go to school were amazed at the concept of swapping engines, they wouldn't understand the IAC system of a honda engine.

    I'll get that valve cleaned out tomorrow, I have confidence that it will work
     
  6. tomtom

    tomtom Senior Member

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    anyone with engine performance knows what a idle air control valve si
    it basic
    all cars have one
     
  7. pills_PMD

    pills_PMD Super Moderator

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    vacuum leak yO?? holla
     
  8. prawjEKt Cx

    prawjEKt Cx Senior Member

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    do you live in the cold???? because the iac valves tend to do this alot
     
  9. Integra1990

    Integra1990 Senior Member

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    hahahaha i feel the same way with about half the city i live in
     
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