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Go Back   E46Fanatics > Tuning & Tech > Driveline, Engine & DME Tuning

Driveline, Engine & DME Tuning
Talk about driveline improvements, NA tuning and DME tuning your E46 BMW here. This includes diffs, intakes, exhausts, chips, software and OBD tuning.

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Old 01-11-2013, 02:04 PM   #1
E46 diamond
Registered User
Join Date: Nov 2012
Location: Co.westmeath Ireland
Posts: 24
My Ride: E46

My E46 is playing **** with me. Any guidance please.

In the morning when it's cold it idles like ****.
When its warm it struggles to idle jumping from 300-600 rpm.
When I plug in the mass airflow sensor it cuts out.

I had 3 different mechanics look at it and none of the said they could find any air leaks.

The throttle body was clean.
there was a new idle control air valve fitted.

Please can somebody help me.

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Old 01-11-2013, 02:18 PM   #2
Registered User
Join Date: Dec 2011
Location: Downey
Posts: 2
My Ride: 330i
U might wanna check the disa valve flap make sure it's intact. Valve is connected to the intake manifold right above the idle control valve.
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Old 01-11-2013, 02:28 PM   #3
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Join Date: Dec 2007
Location: Los Angeles
Posts: 1,852
My Ride: 02 ///M3 Tri-Pedal
Do you know what methods these mechanics used to search for vacuum leaks?
I still think it may be vacuum related.

Btw ...I'm trying to figure out that first sentence in your post.
"Your car is playing _____with me"
I think it might be funny, I wish it wasn't censored.

Bewahren Sie ihre ultimative fahrmaschine

Last edited by ///MPR77; 01-11-2013 at 03:52 PM.
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