Had problems with the car. Engine was idling to fast.
First thing l noticed was wiring for the iac sensor. With the engine idling you would move the wiring for the iac sensor & the idle would speed up, moved it down, the idling would come down. Cut the wiring of. Wired another l had from a loom on an engine that was seized.
Her's the pic of the old iac plug.
View attachment 244849
I showed a friend & he noticed the wiring (l missed it, but again l didn't look either).
This happened in October. It didn't fix the problem.
So, decided it must be vacuum leak. Nothing l did solved the problem. Had plenum pcv & lower manifold of numerous times. No joy!
Thought l had checked the iac wiring a couple of times (rewired the plug) & thought l had done it correctly?
After getting the lim new pcv & correct oring (thanks
@Immortality) + a stripped out thread on the lim for the plenum & fixing that, & getting it back together, & still no change, high idle (1400 rpm on a cold start & idle would go higher as the engine warmed up).
Its 10.30 in the morning, l'd walked away from it the day before after stripping out the plenum bolt then dropping it down the intake. Went fishing wtih the magnet, couldn't catch anything, so called it a day. Thought l was going to have to pull it all down again (wouldn't have been the first time. This was starting to remind me of @
Veewhyfan episode he had last weekend or the one before, when working on his ecotec. His problem was the pcv oring?).
Next day back into it. Went fishing again with the magnet, this time successful.
Anyway, back to to 10.30, engine all back together & high rpm. Turned the engine off. Hmm? Out with the mutimeter & checked the wiring to the iac (this was the second time l had checked. First time l thought it was correct?) plug again. Pins a & b were correct but c & d were mixed up. Corrected the mix up & l have the correct idle.
About bloody time!
Won't take up any more of your time. Thanks for reading my problem.