Rough idle on cold start, oily spark plug tip/thread

[charlielycq@gmail.com]

Been owning this car for 4 months now, one day I noticed the minor shake from the engine while cold start but will go away when the engine warms up.

Figured it could be the carbon built up on the spark plug. So I went ahead replaced all my spark plugs I noticed oily tips/threads on the old plugs for my bank 5 and 7.

The replacement solved the problem for 2 weeks but the problem came back again.

It gets better when the engine warmed up or simply by pressing on the throttle (oil on the plug tip gets burnt)

But I believe it's not because of the valve cover gasket leak neither the spark plug tubes. I just got them all replaced couple of days ago.

Is there anything else that could cause this problem?

Is there anything in between the crankcase and the camshaft case like a sealing gasket for the spark plugs?

Please help!!!

[ItsGary]

The car runs rich for 30-45 seconds on coldstart, apparently it's for emissions and warming up CATS

[charlielycq@gmail.com]

Originally Posted by ItsGary

The car runs rich for 30-45 seconds on coldstart, apparently it's for emissions and warming up CATS

I wish it was, but the knocking feeling is just doesn't feel like it ...

[charlielycq@gmail.com]

the knocking sound appeared at 24 sec and 50 sec

[ItsGary]

Best to have it checked out by a shop that works on BMWs.


Also; Looking at your mileage completely unrelated but have you gotten your belts replaced yet?

[charlielycq@gmail.com]

Not yet...

I might need to leave that to the shop... but I'm afraid of getting ripped off... that's what most of those shop do these days...

[Mdriv3r]

Originally Posted by charlielycq@gmail.com

Not yet...

I might need to leave that to the shop... but I'm afraid of getting ripped off... that's what most of those shop do these days...

There are two belts. AC and Drvie belt. They can be changed using a 14 mm wrench. Id put a rag around it or better yet just buy a $20 kit from amazon. The belts are sold at ECS tuning.

Production date up to start to 05-2008 has different belt routing and different belt. 06-2008- 2013 uses the updated belt.

Its easy to change these, i have done it on my own.

[ItsGary]

Originally Posted by premo

There are two belts. AC and Drvie belt. They can be changed using a 14 mm wrench. Id put a rag around it or better yet just buy a $20 kit from amazon. The belts are sold at ECS tuning.

Production date up to start to 05-2008 has different belt routing and different belt. 06-2008- 2013 uses the updated belt.

Its easy to change these, i have done it on my own.

best for him to use realoem.com and search up using his VIN

[Mdriv3r]

Originally Posted by ItsGary

best for him to use realoem.com and search up using his VIN

This would be a good idea.

[charlielycq@gmail.com]

I just got an engine service light on, I checked on the OBD it was the cylinder 1 misfire. I figured I could have a broken intake valve... what do you guys think?

[charlielycq@gmail.com]

It's the faulty ignition coil~ I tried switch the coil for cylinder 1 to cylinder 4, and start the car, the service light was gone.