yup, I have idle problems also.


-First thing to check is the ICU. Pops right out, check for cold solder joints, clean contacts (I used caig deoxit, which you can get at radioshack) and put some die-electic grease on the contacts.

-This helped a little, but I still have problems. Next I pulled the "Air slide valve" and cleaned it (holding it with the contacts up, as to not get any cleaner on the coil inside) Cleaned with brake cleaner (Sprayed it until cleaner came out clear, not black) and lubed with ATF (atf wont ruin the coils) I also noticed that the tubing connecting the valve was loose on the valve, a couple of hose clamps took care of that.

..and I STILL have idle problems

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-1983 VW Rabbit LS Diesel (5speed, VNT/Giles build)