M20b20 idle slightly hunting

[Onure30]

My e30 320i has a weird idle surging problem and when its warmed it runs super rich.

Ive checked everything and nothing has solved it.

[BenHar]

Try looking through the wiki.
There is a lot of information in there.

Ben

[Speedtouch]

As above. Interesting to see the AFM in operation as you rev the engine!

I would carefully check all around the inlet manifold and intake area for air leaks - try spraying starting fluid around the various joints to see if the engine revs briefly rise, which would indicate a leak.

Also, which ECU do you have? Later Motronic 0 261 200 380/381 versions had extra diodes in the idle control circuit, which are prone to blowing, causing such issues.

[Onure30]

Just done a smoke test and i can see smoke coming from under and left side of throttle body, to me it seems like the tps, maybe the o ring. Tomorrow im going to have a better look.

[Speedtouch]

Interesting. Did you use a proper smoke machine, or just a fag? ;)

[Onure30]

Interesting. Did you use a proper smoke machine, or just a fag? ;)

Not a fag but a vape actually lol

[Speedtouch]

Haha, good one - must remember that trick!