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DIY: Do It Yourself
Post here to share or improve your wrench turning skills! All BMW E46 DIY tips, tales, and projects discussed inside. Learn to work on your car and know the right BMW parts you will need!

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Old 11-12-2014, 09:55 PM   #1
Registered User
Join Date: Oct 2014
Location: Ca
Posts: 3
My Ride: 10 528i & 01 325

Ok so My car had been sitting in my drive way for about a month without turning the car on.
I turned it on, without a problem. But now recently I been getting alot of trouble with the car.
turns fine, kind idles rough at times, but once its all warmed up, it shakes and turns off occasionally.
I get multiple codes.


I have looked over from threads and asked questions,
I have checked intake system and replaced one intake boot that had a crack, but sill have the same issue. I replaced all coils, and spark plugs.
No Crack or leaks that i can see on the intake side now that i replaced the intake boot.

Replaced MAF sensor.
whats funny is that i disconnect the MAF and the rough idle goes away. I rest the ECU and most of the misfire codes go away.
Any ideas?

Going to replace the fuel filter in the morning and check again. fuel pump is one year old that I replaced because the OEM gave out and left me at my works parking lot.

Car is 2001 BMW 325i

Also one thing to point out is that I see smoke coming form the back of the engine on the passenger side, I did notice some oil stains so I am thinking it may be the valve cover gasket going bad. NOTE: when i replaced the the spark plugs and coils, no visual oil was seen in or around the plugs.

thank you all for your time in reading my post
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Old 11-13-2014, 08:26 AM   #2
Registered User
Join Date: Jul 2008
Location: USA
Posts: 6,168
My Ride: 2001 330Ci
The reason why the car idles fine when the maf is disconnected is the ECU goes into a default mode. That is, it ignores the data from the O2 sensors and uses a pre-programmed air-fuel mixture map. This map is overly rich.

Have the intake smoke tested. You have vacuum leaks.
markusmarkus is offline   Reply With Quote

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