What next?

[jamiholzbach]

I just put a new head on my '89is and it ran great ... for a day.
now it'll start and idle fine when cold and will even get up and go faster and smoother than my '87, until it warms up to operating temperature, then it starts to run rough until it boggs down and stalls out. but only at operating temp? I swapped the idle control valve with a known good one and that still didn't have an effect. I'm thinking it has something to do with either the temp sensor, the O2 sensor, or the ECU. Anybody else experience this, and what did you do to fix it?

[wagonizzle]

Pull any codes yet? My car acted similarly when the coolant temp sensor died. About twenty bucks and get a double offset wrench or it will be tough to get it out. Assuming that's even your problem. But if you are running that badly, the check engine light is probably on...

[thereisnoyun]

coolant temp sensor x2

http://www.realoem.com/bmw/showparts.do?model=BB13&mospid=47326&btnr=11_0759&hg=11&fg=35

I think its 13, the more expensive one.

[EvoStevo]

coolant temp sensor x2

http://www.realoem.com/bmw/showparts.do?model=BB13&mospid=47326&btnr=11_0759&hg=11&fg=35

I think its 13, the more expensive one.

Wait, what is #16 in that picture?

[jamiholzbach]

You Guys will laugh!

After I had gotten everything together and had driven it around a little bit, I had decided to give the car a bath as it had been sitting for almost six months. And in my attempt to clean up all the greasy fingerprints under the hood, I got water in the O2 sensor connector. Thats why it wound run fine when cold but die out once it reached operating temp. So, I dried it out and put it back together and it ran fine:)

[Knockenwelle]

The injector/CTS harness plug under the intake will do the same thing. Be careful...