My Z18XE is a real pain in the behind ..
Symptoms are lumpy idle and often it is undriveable the first minute or 2 from cold. After that the car resumes normal operation and only the lumpy idle remains...Oh yeah and the emissions warning light.
So basically it idles like a sack of potatoes, opcom says desired speed is 875RPM but it jumps between 700-900..
I have 2 videos of the engine in idle.
First off is the engine itself.
Then there is the exhaust.
Both videos play fine on my windows media player and vlc player.
If i reset the error codes the emissions light will go out but after only a bit of driving the error code will return and a day or 2 after the light will come on again.
The error code i get is :
P0170 - Lean Exhaust
(02) - Present
Someone told me that this code was often related to the MAF so i went out and bought a new one but there is no difference with the one or the other. Oh and i have tried both for a period of time to make sure that it was not just the ECU needing to adapt.
I also just made a recoding of livedata, dont know if this will help.
It is a recording of idle, accelerating to 80kmh, driving for a bit and then down to idle again..
I noticed that the spark angle was flying around when idling...Dont know if this gives any clues....When driving it seemed to be steady.
Also i have cleaned the TB and today verified that everything is still ok with the tb.......Found the pinhold had clogged up again and that the pipe that the pinhole is attached to the hose with had split so i put a clamp on that hose and tightened it. (Doubt it had anything to do with it since the hole was blocked but clearing it did not help anything.....BTW there was no clamp on that hose before ???)..
Have been looking around for leaks in the exhaust system but found none.
Car seems to be doing a little less mpg than before i got this problem.
Also the idling has become so bad that when i stop at a traffic light i can litteraly feel the car jerk because of the engine cycling up and down i the revs...
Hope someone has seen this problem before.