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High idle and "Check engine " light

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    #1

    High idle and "Check engine " light

    I was driving my 89 Colony park today and I noticed the "Check engine " light flashed a few times while coasting to a light and while slowing down for traffic. When I pulled in my driveway the idle was way up, like 2000 RPMs. The light never came on again, but the idle would not come down. I shut the car off and waited 5 minutes before starting it again.
    It idled normal and no light. Any ideas? WagonMan
    89 Colony Park
    90 Colony Park
    70 HEMI Daytona Convertible
    Tags: None
    #2
    Maybe a dirty IAC or throttle blade? Other than that maybe check the wiring to the IAC to be sure it's not worn in a spot and grounding out somewhere.
    These are highly engineered precision vehicles, the first step in diagnosing the problem is to strike the suspected offending part sharply and repeatedly with a blunt object, then re-test.

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      #3
      Did you read the codes? I would suspect and EGR code but I'm not sure if they turn the light on. Not all codes cause the light to come on.

      Panthers: 83 GM 2dr | 84 TC | 85 CS | 88 TC | 91 GM
      Not Panthers: 85 Ranger | Ranger trailer | 91 Acclaim | 92 Jaaag | 05 Focus
      Gone: 97 CV | 83 TC | 04 Focus | 86 GM      ​ |​ Junkyards

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        #4
        not much sets the light, but a bum TPS will do it and that might mess with the idle. Code scan time
        86 Lincoln Town Car (Galactica).
        5.0 HO, CompCams XE258,Scorpion 1.72 roller rockers, 3.55 K code rear, tow package, BHPerformance ported E7 heads, Tmoss Explorer intake, 65mm throttle body, Hedman 1 5/8" headers, 2.5" dual exhaust, ASP underdrive pulley

        91 Lincoln Mark VII LSC grandpa spec white and cranberry

        1984 Lincoln Continental TurboDiesel - rolls coal

        Originally posted by phayzer5
        I drive a Lincoln. I can't be bothered to shift like the peasants and rabble rousers

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          #5
          Also, is the ECM's temperature sensor connected/good? I accidentally left mine disconnected and when I got to work the idle was up to 2k or so. Plugged it back in and all was fine. Opps.
          1985 LTD Crown Victoria - SOLD
          1988 Town Car Signature - Current Party Barge

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            #6
            I changed the TPS and its fixed. Thanks for the help. WagonMan
            89 Colony Park
            90 Colony Park
            70 HEMI Daytona Convertible

            Comment

              #7
              Originally posted by WagonMan View Post
              I changed the TPS and its fixed. Thanks for the help. WagonMan
              Originally posted by gadget73 View Post
              not much sets the light, but a bum TPS will do it and that might mess with the idle. Code scan time
              This guy is good haha
              1985 LTD Crown Victoria - SOLD
              1988 Town Car Signature - Current Party Barge

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