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I need your help with idle problem 700 1989

posted by  NJC on  Sat Jan 28 05:04 CST 2006
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last visit: Sun Jul 24 13:42 CST 2011
[RELATED]

Original post:

RWD - Hesitation @ 1000RPM.

To recap, I've gone through FAQ Slight Hesitation on Acceleration; Several Diagnostic Checks, cleaned throttle body and checked TPS/AMM connections + recently cleaned IAC.

Any further ideas? I'd like to get this fixed.
--
Norm Cook; Vancouver BC; 1989 745T 210,000KM








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    I need your help with idle problem 700 1989

    posted by  darmstrong on  Sun Jan 29 04:43 CST 2006
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    last visit: Sat Sep 13 12:21 CST 2014
    [RELATED]

    When you say it surges, I take it you mean the RPM jumps way too high when you slightly depress the accelerator?

    I would think that your prime suspect would be the IAC. It should be closing when you come off idle. Have someone push the pedal just off idle, then immediately pinch off the inlet hose to the IAC when this occurs. If this eliminates the surging, then either:
    1) your TPS switch signal isn't making it to the ECU (or the ECU is faulty)
    2) your IAC is sticking open, when it should be closed off-idle.

    I made some other suggestions at the bottom of this thread that might be helpful. (Ignore my earlier post in that thread, however; it was just plain wrong!)
    --
    David Armstrong - '86 240(350k km?), '93 940T(270k km), '89 240(parts source for others) near Toronto








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    I need your help with idle problem 700 1989

    posted by  Sumerduckman on  Sat Jan 28 11:43 CST 2006
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    last visit: Tue Aug 21 11:31 CST 2007
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    Hello Norm: If it hasn't been done already,then I would go ahead and replace the intake manifold gasket. It is an easy job,won't hurt,is cheap and it would rule that one out.
    --
    Gary Gilliam Sumerduck VA, '94 940 Regina 168k '86 240 198k, 93 Camry 4cyl 5spd 245k








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      I need your help with idle problem 700 1989

      posted by  someone claiming to be fixit 2003 on  Sun Jan 29 01:53 CST 2006 [RELATED]

      There's a post a few days ago where someone sprayed butane lighter fluid around the intake system to check for leaks. The idle increased and they thought it indicated an intake system leak. Wouldn't want to try it around an old points/condenser ignition system but it may be worth a try? Was the IAC bench tested to see if it actually worked?








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      I need your help with idle problem 700 1989

      posted by  NJC on  Sat Jan 28 12:57 CST 2006
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      last visit: Sun Jul 24 13:42 CST 2011
      [RELATED]

      Hi Gary, I haven't bothered with intake gasket since it was replaced summer '97 or ~50K miles ago. At a Volvo dealer too so should be decent quality.

      As mentioned vacuum is 18in/hg although a little rough.
      --
      Norm Cook; Vancouver BC; 1989 745T 210,000KM








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        I need your help with idle problem 700 1989

        posted by  Sumerduckman on  Sun Jan 29 02:45 CST 2006
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        last visit: Tue Aug 21 11:31 CST 2007
        [RELATED]

        You may want to still consider it as a possibility, and not dismiss it out of hand. I have had two go bad over the years, always sagging/leaking at the bottom of the #2 or #3 runner.
        --
        Gary Gilliam Sumerduck VA, '94 940 Regina 168k '86 240 198k, 93 Camry 4cyl 5spd 245k








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    I need your help with idle problem 700 1989

    posted by  Garyh on  Sat Jan 28 09:12 CST 2006
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    last visit: Sun Apr 15 11:44 CST 2012
    [RELATED]

    If its a rough idle problem that disappears after engine is warm (I'm not sure of you problem from you post), could be temp sensor at rear of engine block. It controls fuel based on temperature.

    Gary







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