Greetings, Folks,
I'm back in the E30 world after a long absence. I just picked up a mint CA '89 325i.
The car ran beautifully but the only service history I had was the magic belt and water pump. To get everything to a baseline, I did quite a bit of work yesterday:
-Valve adjustment (looked like somebody did it cosmetically- all the adjustment holes on the eccentrics were lined up!)
-Plugs (Old plugs were correct, but worn and showed signs of some hot running)
-Cap/Rotor (BADLY pitted)
-Air filter (found that the previous owner had fitted a K&N, which I wasn't overly thrilled about but kept it)
-Engine/Tranny/Diff Oil
-Brakes
Anyway, I created a symptom: the cold idle tries to drop below 500 RPM. The motor catches itself, revs past 1100k or so, then drops back down. When under load, the engine is fine. Once warmed up, it steadies to a very low idle at about 600 RPM.
I went back over and verified everything I did on the ignition. I can't find any evidence of a vacuum leak, and when I create one (crack open the dipstick, for example) the engine almost dies entirely and runs horribly.
On my last E30, a 325e, my next step would be to turn the screw on the idle air control, but I don't see this on the i motor. Does anybody have any ideas?
Thank you for reading!
I'm back in the E30 world after a long absence. I just picked up a mint CA '89 325i.
The car ran beautifully but the only service history I had was the magic belt and water pump. To get everything to a baseline, I did quite a bit of work yesterday:
-Valve adjustment (looked like somebody did it cosmetically- all the adjustment holes on the eccentrics were lined up!)
-Plugs (Old plugs were correct, but worn and showed signs of some hot running)
-Cap/Rotor (BADLY pitted)
-Air filter (found that the previous owner had fitted a K&N, which I wasn't overly thrilled about but kept it)
-Engine/Tranny/Diff Oil
-Brakes
Anyway, I created a symptom: the cold idle tries to drop below 500 RPM. The motor catches itself, revs past 1100k or so, then drops back down. When under load, the engine is fine. Once warmed up, it steadies to a very low idle at about 600 RPM.
I went back over and verified everything I did on the ignition. I can't find any evidence of a vacuum leak, and when I create one (crack open the dipstick, for example) the engine almost dies entirely and runs horribly.
On my last E30, a 325e, my next step would be to turn the screw on the idle air control, but I don't see this on the i motor. Does anybody have any ideas?
Thank you for reading!
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