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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 11-04-2012, 10:24 PM   #1
vlcmstnsct
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Join Date: Aug 2012
Location: Christiansburg, VA
Posts: 64
My Ride: 2002 E46 330i
BMW TC 103 - VANOS Faulty Reference Value Intake

I replaced my VANOS seals and did the anti-rattle kit this past September. As far as I could tell everything was working very well as my friend and I are very mechanically inclined and I made sure to take my time and clean everything up really well etc. For the past 3 or so weeks something has felt off with my 2002 330i; nothing drastic. My car has never thrown any CEL. I was snooping around with INPA tonight and found where the DME has a separate place for stored VANOS codes and there it was...BMW TC 103. I went back and I was observing the values for the intake vanos and sure enough the the value for the actual position of the intake vanos was slightly off the target value for the intake vanos. And by off we are talking less than 1 degree and for the most part it seems to be when idle. I'm going to monitor it a little more extensively within the next few days. Now in comparison the exhaust vanos target value and actual position value are dead on. I don't know how long it's been going on because it has never thrown a CEL or anything. With the car running in INPA I can clear the code and it comes back on and stores it within 1-2 seconds. I also tried clearing all the adaptations again and its still there. This sucks but at the same time I am happy because I knew something did not feel right. Any help, thoughts, or ideas would be helpful.

Thanks,
Aaron

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Regards,
Aaron
2002 330i 5spd

VIR Oktoberfast 2013
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Old 05-07-2013, 10:29 AM   #2
vlcmstnsct
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Join Date: Aug 2012
Location: Christiansburg, VA
Posts: 64
My Ride: 2002 E46 330i
Update

Update: My intake CPS had SOFT Failed 100%. I replaced my intake camshaft position sensor today and cleared the code (TC 103) and also my adaptations, started her up and it did not come back on. Before replacing my CPS with the car at idle I could clear the code and it would come back almost instantly.

FYI there was no MIL or CEL on the DASH for a soft failed CPS and the only way I could view the code was with INPA. It was only viewable under E46 -> Chassis -> Body Electronics ZKE. It would not show up under E46 -> Engine -> MS43 M54.

What led me to find all this was after rebuilding my VANOS I would still experience a very slight hesitation and/or slight throttle surge and I could only feel it in 1st gear from a dead stop.
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