Weird Idle situation

[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. :Bang

 

[l-m tech]

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

 

[Bagged86]

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.

 

[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.

 

[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 ?

 

[l-m tech]

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