This is on an '86 951, the idle is at 800 cold and at 1200 warm which it sometimes spikes up to 2000. I have already checked the TPS, rebuilt the TB, checked and repaired all vacuum leaks, remove venturi, etc.

Before I go and order a new ICV I am wondering what else could cause this idle problem. Ideas??


Second question. This car has Autothority chips, will these chips work with a 3 bar FPR or do I need new ones that are designed for a 3 bar FPR, or doesn't it matter?

 

Anyone know about using a 3 bar FPR with Autohority chips? Any problems?

I did a search regarding idle problems which pretty much comes up as a vacuum leak being the usual cause. I have already fixed all the vacuum leaks.

 

I'd clean the ICV and see if that works. In my experience with all cars they tend to stick after a while because of varnish build up. Carb cleaner sorts them out.

With the chips if they are designed for 2.5bar and you put a 3bar FPR on you will be rich unless they have a jumper setting or something you can change to tell them the pressure is higher.

 

check the basic setting on the throttle stop screw. when it touches the throttle plate, another 1/2 turn and lock it down.

it could be holding the throttle open too far.

87951