82 idles too high
Race Director
Joined: Dec 1999
Posts: 16,945
Likes: 9
The idle isn't adjustable, the minimum air setting however is but it's a tricky operation if you don't know what you're doing or why. If you want the full details I'll write it down (some hefty typing involved there 
) but check for vac. leaks first, around lid, TB's, lights, brake booster but also AC controls (the switch w/ that white plastic part w/ holes & o rings can come apart and leak) Cruise control disengage switch (brake) and heater door controls.
) but check for vac. leaks first, around lid, TB's, lights, brake booster but also AC controls (the switch w/ that white plastic part w/ holes & o rings can come apart and leak) Cruise control disengage switch (brake) and heater door controls.
Instructor
Joined: Mar 2002
Posts: 144
Likes: 14
From: Central FL
The first thing I'd check is a vacuum leak as suggested above. I believe there are four main hoses coming off the intake manifold: PVC Valve/Vapor canister, headlights, brake booster, HVAC/cruise control. Pull one hose off at a time and block the vacuum port. If one (or more) causes a decrease in idle rpm you know that is the circuit that needs repair. If there is no difference, it may be a gasket leaking, a missing intake manifold bolt or leaking/defective IAC motor.
Le Mans Master
Joined: Mar 2002
Posts: 8,575
Likes: 3
From: On an island surrounded by sharks Hawaii
My 82 was idleing high also. Found a small broken hose near the driver's side fender well by the alternator. Replaced it and the idle came down but still not enough. Pretty sure the leaks are coming from the intake and or tb's. HTH
Heel & Toe
Joined: Mar 2005
Posts: 21
Likes: 0
From: Plainfield Illinois
My 82 idled high as well. I replaced the Idle speed controller. The IAC motors on both TB's. And replaced the EGR valve and gasket. This lowered my idle, but still was a little erratic. It has since come to my attention that I have a small leak on the intake manifold itself. Gaskets soon to be replaced. The most amazing thing happened when I changed out the fuel pump this morning. The idle kicked back up and held steady at 900 RPMs and I lost any and all hesitation in the throttle. It was the most amazing difference in overall performance than any modification or parts replacement to date. Good Luck!
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Thread Starter
Drifting
Joined: Sep 2004
Posts: 1,270
Likes: 4
From: Celeste Texas
While I was changing a mountain of hoses I shot a little carb cleaner at the base of the throttle bodies and found massive leaks at both. I picked up new base gaskets today and the top ones will be here next week. Hopefully that will solve all my troubles.
Bill
Bill
Race Director
Joined: Dec 1999
Posts: 16,945
Likes: 9
because you remove them from the lid and the new gaskets aren't the same exact thickness as the old ones, so the vertical pos. of the TBs relative to each other will change and it will have an impact on things. One could try to install them and see how it runs but it could be way off, the synchronising is a pretty precise setting.
If you hold the TB;s and move one vertical (or ven horizontal) in relation to the other you will see that the linkage will push one of either TB's open (depening on which one is at the stop screw)
If you hold the TB;s and move one vertical (or ven horizontal) in relation to the other you will see that the linkage will push one of either TB's open (depening on which one is at the stop screw)
