Cold start issue

[hurttech]

Car is a 327i with 89 i electronics and a 173 DME. Yesturday was the first day with this issue, car started fine before, almost too well haha. Now when I get in if the car has been sitting overnight or 4+ hours it will take forever to start. 10-20 seconds of no fire cranking. Once started any blip of the throttle will cause it to die, but it idles just fine. Today i gave it some throttle to see if it would rev, and it did albiet unwillingly with a ton of unburnt fuel comming out the tailpipe (gas not liquid) After a minute or so of warm up the car runs and drives normally. Could this be a fuel pump going, bad FPR, AFM?

[jlevie]

A fuel system problem is a possibility, but higher on the list of suspects would be intake leaks.

[hurttech]

A fuel system problem is a possibility, but higher on the list of suspects would be intake leaks.

Even though the car runs perfectly once warmed up?

[E30_fiend]

Even though the car runs perfectly once warmed up?

yes. Because when metal is cold its clearances are larger. Once the metal heats up,from the car warming up, those clearances become smaller and eventually will close the gap. Thats why it runs better warm.




Taylor

[jlevie]

A cold engine needs a richer mixture, which means that even a small intake leak can cause problems. Furthermore at start the engine management system is running open loop and thus can't compensate for unmetered air. But once the engine is warmed up learned adaptation may be enough to compensate for intake leaks.

[hurttech]

Took the intake elbow off and found a "ton" of oil coating the AFM back to the inside of the intake manifold. I accidentally left the oil cap off and went for a drive in the canyons, guessing that could cause oil to get up there. Problem is, I have been "burning" a lot of oil lately. Could the "Tube of death?" be the culprit?

[hurttech]

Car took 3 10 second bouts of cranking to get it fired. Once started it ran perfect without any idle issues or stumbling. Could there be oil coating the plugs causing this?