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Weird Idle situation

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Posted by: Bagged86

Hello this is my first post... I went theought the forum for a bit before I asked this just to make sure it wasent covered.....

I have an 86 Towncar, It will idle and drive fine for weeks at a time, Then it would either stall out or idle at 40 MPH, I replaced the IAC and it never fixed the problem. Could i have maybr got a bad IAC or is there some other problem that is hidden in there somwhere ?

p.s. as far as the idle, It idles so high that on a rainy day it will power brake at a stop light.

I unplugged IAC and it just idles ok but stalls alot and still idles high some of the time.

I am baffled.

Posted by: l-m tech

can you hear any vacumme leaks. disconnect the linkage and see if it idles down.

Posted by: Bagged86

Quote:

Originally Posted by l-m tech

can you hear any vacumme leaks. disconnect the linkage and see if it idles down.

When it starts to idle up it will CLICK then i hear lots of air rushing, I will disconnect the linkage and see what happens.

Posted by: l-m tech

is the click that you hear the ac coming on.if so it will make the iac flow more are to compensate for the load.

Posted by: Bagged86

Just a thought. Does the EGR run of of a cylinoid ? My egr is broke i was thinking maybe the relay would click and the egr would suck air ? Maybe ?

Posted by: l-m tech

if the egr sticks open at idle the car should stall out.