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Thread: 87 442 VIN9 High Idle

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    Default 87 442 VIN9 High Idle

    I have an 87 442 VIN9 motor running top notch on the computer in my 85 442. It's been rebuilt, as was the trans with a light shift kit (KCF from an 87 Salon) and has a 7.5" 3.73 posi from an '83 Hurst.
    After 30 minutes of driving this morning I got on the gas really good at WOTand the idle bumped up from 850 in drive to 1100 rpm in drive and 1100 to 2400 rpm in park.
    I checked the carb for sticking linkage, choke bits, secondaries etc. to see if anything was sticking and nothing was. I even turned down the idle screw all the way with no change.
    Is it possible that the mixture solinoid is causing the high idle or the ignition module in the distributor after putting the motor through the ringer?
    Would a stuck TPS plunger in the carb body do this?
    It's not mechanical, no vacuum leaks either... more of a computer issue...
    I suspect it will be back to normal come lunch time, just curious as to what may cause this.
    BTW I managed to go 62 miles yesterday on 3.2 gallons of gas with extremely light driving, 19.3mpg is pretty good for 80's technology
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    Dam idle was acting up again tonight, this time I just turned off the car and it would be fine until I reached 1100 RPM and it stuck like cruise control (which has been completely gutted).

    I did this a few times before I had a eureka moment when I ever so slightly touched the A/C slider and moved it an 1/8" to the left out of the Defrost setting.

    Found out the Idle Load Compensator Solinoid was kicking on at the oddest times, not sure why... I've never experienced this before.

    It would kick on namely after heavy driving if the A/C control was in Defrost.

    Does the defrost use the A/C compressor?

    The same effect happens when the A/C Max setting is engaged, even though the system isn't charged, which is expected.

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    The A/C compressor is used in the defrost setting. Due to high moisture levels in the incoming air, the A/C system is used to blow dry air across the windshield. Thats why the solenoid engages.

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    That's what I thought, never noticed it on my 87 442 or 83 Hurst Olds before and they're bone stock, my other 85 442 has yet to see the road and I've never owned any other Gbodies that weren't molested in someway under the hood.
    Lightning Rods repair service:CLICK HERE
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    1988 H/OCA Advisor
    88 H/O #1 of 4
    88 CSC White/Claret - T-tops
    88 H/O Triple Black
    87 442 Black/Gray - T-tops
    85 442 White/Blue - T-tops
    85 442 White/Blue - T-tops
    85 442 White/Claret - T-tops
    85 442 White/Sage
    84 H/O Aero Commemorative #2199 - Sunroof
    83 H/O #2400 Sand Gray - Sunroof
    83 H/O #1607 Sand Gray - T-tops
    83 H/O #727 Maple
    "Keep them Rockets lit!"

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    Was ready to suggest what you found OR the quintessential vacuum leak which = more air, compensated with more fuel, = more idle speed. They can be a REAL PITA to find. Glad you found it though . . .

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