1st Generation Specific (1979-1985) 1979-1985 Discussion including performance modifications and technical support sections

high idle when hot

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Old 09-02-02, 06:36 PM
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high idle when hot

the hotter the temp. is outside the higher my car idles...will go to about 1800RPM, any clue why?...thanks jack 85GS
Old 09-02-02, 07:00 PM
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possible mild vacuum leak, or a sticking throttle linkage, choke partically stuck?
Old 09-02-02, 07:14 PM
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i don't think it the throttle, and wouldn't a vac leak make the idle drop?...choke is a possibility
Old 09-02-02, 07:32 PM
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Originally posted by xjackhx
... and wouldn't a vac leak make the idle drop?...
you'd be surprised! not all vacuum leaks cause idle to drop, sometimes it raises it.

anyway, is the car a 12A/carbie or SE? if it's 12A what kind of intake are you running?
Old 09-02-02, 08:38 PM
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12a...stock...the intake hose is gone...just the ble metal round thingy
Old 09-02-02, 08:57 PM
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Try this, the next time you have a high idle.

When the car is idling, put your right foot toes under the accelerator pedal and pull it up. If the idle drops back to normal then you have a sticky likage problem.

Mine does the same thing, idling about 1100 when it's hot. If I pull it up it drops down to 700 or so.
Old 09-02-02, 09:55 PM
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tried that ...doesn't work....my idle is 1050 or so to begin with, and i get realy crappy gas mileage...
Old 09-03-02, 05:34 AM
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check your anti-afterburn hose
Old 09-03-02, 10:57 AM
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Check the accelerator cable housing where it goes into the adjusting mechanism next to the carberator. Mine pulls out of that barrel sometimes and causes a high idle.
Old 09-03-02, 11:00 PM
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Check your timing first off, before you adjust anything. I had the same problem (as well as bad gas mileage) and it was a bad ignitor. Once your timing is good, check both float bowls for flooding. Make sure that the fuel line is centered at idle. Make sure you don't have a broken ignition wire. A lot of times, people will crank up the idle or tweak the timing to cover up a problem. Also, make sure your throttle cable has some slack to it.
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