I have an '86 325e and the idle remains at a steady 1000-1200 rpms when warmed up. The ICV is new and I've swapped out the ICM with one that is known to be good and have checked for vacuum leaks. The strange thing is that when I remove the oil fill cap the idle stabilizes and the car runs great. What gives?
-
-
did you adjust the screw at all on the ICV? Does your TPS make a clicking sound when you open the throttle butterfly? Your motor should die, or run very badly when you remove the filler cap. My guess is that your car is not getting idle signal from the TPS. So check that first, if okay, I'd say adjust the ICV.
How does it idle when its frist started?Old and improved:
-
I have a brand new ICV and have tried adjusting the flow control screw. The TPS clicks as it should when the throttle opens also. I do have a spare TPS and will swap them out. At startup the idle drops down to where it should be once the engine is warm, but jumps to 1000-1200rpm after driving for a while. The idle does not fluxuate, its just high. I know the engine should idle rough when a vacuum leak is intoduced to the system but mine actually idles better when the cap is off.Comment
-
I had this problem when my car was all eta. I really found no "fix" for it. Here is something off the wall you can try. I take it that its colder outside where you live. My car only did this when it was under 50s or so. Unplug the o2 sensor and see what happens. I normally ran my o2 unplugged, but started running it for awhile. I noticed that if I unplugged it when it got cold out it would idle normal. I never found another fix, even a brand new o2 didnt eliminate all of it.
If you pinch the tube coming off the ICV to the intake boot you should notice that the car will idle correctly. However, it will run like shit when its cold, so its not a good fix. I have also heard of people making a plate with holes inside the tube that restricts the amount of air going back into the boot. Same concept as pinching it off but still allows some air. It will also make it run crappy when cold though.
For some strange reason when I did head work, put new valve springs and cam in I had no idle problems at all with all the eta parts. It even had lower idle vacuum (~12-15 inches). I had to turn the screw out because it was idling too low. How much idle vacuum do you have?Old and improved:
Comment
Comment