BMW technicians....
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Re: BMW technicians....
As the owner of 2001 325i here's what i can tell you:
the lean codes can be caused by one or both camshaft position sensors being faulty
also the O2 sensors on the E46 are famous for going bad
pretty much these are the main weak points in the car besides the infamous window regulators
the lean codes can be caused by one or both camshaft position sensors being faulty
also the O2 sensors on the E46 are famous for going bad
pretty much these are the main weak points in the car besides the infamous window regulators
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Re: BMW technicians....
we've dealt with the cam sensors and all of that on these cars, we see them everyday. This problem seems unique, with nothing pointing in a good direction.
We have an Autologic here that we use for BMW/Mercury Benz, I've taken values of both the pedal input sensors, the throttle valve angle and voltages, and the MAF. I unplugged the MAF this am and the car ran the exact same as with it connected.
We have an Autologic here that we use for BMW/Mercury Benz, I've taken values of both the pedal input sensors, the throttle valve angle and voltages, and the MAF. I unplugged the MAF this am and the car ran the exact same as with it connected.
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Re: BMW technicians....
You have a MAF problem then. Nothing changed when you unplugged it, no different airflow readings or anything like that?
Did you take those readings with the Autologic when you were driving or just sitting still? You might not see anything at all unless you can get readings during the faulty engine conditions.
The only think I could think that would cause the engine to run the same with the MAF unplugged (other than a MAF or MAF wiring problem) is if the ECU was in failsafe mode and was using fixed values for most of the sensors. That should definitely make itself known though, so I can't think that would be the problem.
Last edited by Fabrik8; 12-19-2008 at 08:04 AM.
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Re: BMW technicians....
If the MAF was the problem, when I unplugged it the ecu would default to a "basemap" and the problem should have dissapeared. I didn't take readings with it unplugged because I was just trying to see if the problem was remedied or not.
The readings I took were while having a coworker drive the car down the road and recreating the problem.
The readings I took were while having a coworker drive the car down the road and recreating the problem.
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Re: BMW technicians....
So the ECU defaulted to a basemap and threw a fault code when the MAF was unplugged, but the problem with surging was still there?
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