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Occassional Idle + Take Off Problems 900

posted by  bauch on  Thu Apr 26 17:56 CST 2007
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last visit: Mon Mar 24 13:22 CST 2008
[RELATED]

Hi everyone

Recent I've begun to notice an "issue" when taking off from idle after... for example sitting at a stop light for a while. I will be sitting at a stop light, idling for a while and once the light turns green and I give it gas - occassionally the engine will stutter, almost stalling but it then saves itself and continues.

I should also mention that occassionally at a stop light, while idling the car will "stutter" like it does on take off as explained above, but without stepping on the gas. The first time it happened I thought... crap I'm about out of gas - but that wasn't it. I believe these two things may have to do with each other but I'm not quite sure.

Any suggestions would be greatly appreciated - thanks!
--
'93 Volvo 945 w/128K miles








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    Occassional Idle + Take Off Problems 900

    posted by  bauch on  Sun Apr 29 17:54 CST 2007
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    last visit: Mon Mar 24 13:22 CST 2008
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    Thanks for all of your replies, everyone. I haven't had a chance to look into this besides checking the codes.

    The only one I got back was - Socket B, Port 2:

    1-2-2. Looking in the FAQ this would mean something is up with the Air Temeprature System (I do have a Regina fuel system)? Would that cause any of the issues I'm having? Would that signal a CEL light too?

    Edit: Socket B, Port 6 reads nothing. I couldn't get any lights from it yet... is that normal?

    --
    '93 Volvo 945 w/128K miles








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    Occassional Idle + Take Off Problems 900

    posted by  Hovonogila on  Sun Apr 29 07:40 CST 2007
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    last visit: Mon Sep 22 20:53 CST 2014
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    Check the ODB codes for IAC operation. If you don't clean it carefully you can damage it. Ever change or check the fuel pump or the FPR?








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    Occassional Idle + Take Off Problems 900

    uid 17648's pic
    posted by  Shifted on  Thu Apr 26 18:27 CST 2007
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    last visit: Sat Nov 19 19:05 CST 2011
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    Sounds like maybe your idle air valve is getting sticky; it can be easily replaced or cleaned per the FAQ's...

    Check for dirt also in the flame trap and throttle body, and for any bad vacuum hoses. Check function of TPS.

    That's where I'd start...

    --
    Scott 'Bricking on Japan time' Night shift is ON
    --------1993 945 GLT 74,000--------1973 Suzuki Jimny 'Brute' 61,000--------








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      Occassional Idle + Take Off Problems 900

      posted by  bauch on  Thu Apr 26 19:07 CST 2007
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      last visit: Mon Mar 24 13:22 CST 2008
      [RELATED]

      Hi Shifted,

      Thanks for the quick response, its much appreciated!

      I've cleaned the IAC recently with some carb cleaner, which helped some cold rough idle problems I was having, but it probably wouldn't hurt to do it again. It's easy to do.

      If that doesn't fix my issues, I'll try the other suggestions.
      --
      '93 Volvo 945 w/128K miles








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        Occassional Idle + Take Off Problems 900

        posted by  darmstrong on  Sat Apr 28 14:50 CST 2007
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        last visit: Sat Sep 13 12:21 CST 2014
        [RELATED]

        Check your throttle position switch too - that's what kicks the IAC in and out as you go in and out of idle.

        --
        David Armstrong - '86 240(350k km?), '93 940T(270k km), '89 240(parts source for others) near Toronto







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