Quote:
Originally Posted by simeon96
It's a 1.8 with KE-Jetronic. M102. 1991. Has about 302000km on it.
Oil, coolant, sparkplug wires and headgasket has recently been replaced. Thought the surging idle was either the sparkplug wires or headgasket (there was oil in the overflow tank). The problem still persist after all of this.
One thing I noticed was that there was no difference on how it ran if I pulled the plug for the IAT sensor. Also tried removing the contact for the ECU and then start the car. The only difference was that the idle RPM's were higher (around 1300) and the surging had stopped.
EDIT: It's a manual w/o AC. The exact same problem was before the headgasket replacement, I doubt there's a vacuum leak caused by that.
|
The air intake sensor has little effect on mine too. I wouldn't worry about that bit.
Good to hear that the engine runs with out the ECU being plugged in. To my mind that means the fuel side is probably OK. What's happening is that the air idle control valve is not working during this idle phase which means that the high rpms are to be expected.
That you get lower rpms during the warming up phase indicates that the air idle control valve is doing or trying to do its job.
The pipe work that connects the crankcase breathing to the air idle control valve (back of the fuel distributor) and the pipe work that goes into the bottom of the air mixture unit (under the fuel distributor and to the right) needs to be in good condition. Again WD40 might help show some problems in this area.
(Other stuff to consider but I won't over load just yet!)