Hi All,
Longtime listener, first-time caller. I just bought my first e30 the other week and she's everything I never asked for. Honeymoon phase aside, it's got a very annoying idling issue that a lot of people here seem to have... except most people don't mark their post as "Resolved" when they find the answer, so I never see what the solution is.
See a video of the problem here: https://www.youtube.com/watch?v=Lu3qyZaeO7U
The idling issue really only comes up when the car is at full operating temp, and when it's not under load. I experience no loss of power when driving, and no idle surging for the first 15 minutes of driving typically.
Oddly enough, when I bought the car and test drove it over the course of two days, I never saw this issue come up. I took it on the freeway, drove around some residential streets, and then drove it about an hour back home, and never saw the idle surge. There was some minor idle hunting which didn't really bother me, but it would at least just sit at a constant 1,200 or 800... in no way was surging as it does now. Also, when I give it gas there is no hesitation, but when I let off the accelerator the RPM's dip before leveling back out... again only when the car is warmed up.
Some things to note which may have caused the issue:
1.) On the second day of owning it, the alternator belt snapped (It was old and brittle) and I didn't realize it happened for a bit, till the temp gauge shot up and coolant started overflowing. whoops... so maybe it had something to do with it overheating? I replaced the alternator belt and power steering belt, and it was fine
2.) I drove it for a few days and decided I wanted to clean it up a bit. There was some pretty sketchy tape job on some wiring near the bumper on the passenger side in the engine bay (Right behind the headlights) A previous owner used painter's tape which was old and fraying away, so I carefully removed it and re-taped. Could that be related? Ive got no f*ckin clue.
3.) I replaced the ICV with another one I bought used on eBay, I replaced the blue temp sensor and replaced the TPS. None of which really helped. Going to try the fuel filter.
If any of you guys have any idea on what could be causing this, please let me know. It's driving me up a wall.
Thanks!
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