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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 08-30-2013, 04:32 PM   #1
e30runner
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Join Date: May 2013
Location: Sacramento, CA
Posts: 4
My Ride: 2001 BMW 325i
Please HELP!! Issue with ecm resetting itself.

So I recently bought a wrecked 2001 325i from an insurance auction. After repairing the damage with new parts, there are a few issues that I still havent been able to sort out. The main one is that it seems like the ecm isnt holding any memory. Here is what I have noticed, everytime I start the car the trip meter is at 0, the car hesitates for the first 20-30 seconds which seems like its learning what proper idle is, and the oil light turns on for about 5 seconds.

The car has a brand new battery and all of the fuses are good.
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Old 09-02-2013, 08:19 PM   #2
e30runner
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Join Date: May 2013
Location: Sacramento, CA
Posts: 4
My Ride: 2001 BMW 325i
Does the ecu have an internal battery that helps it hold memory?
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