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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 08-07-2012, 02:03 PM   #1
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Join Date: Jan 2011
Location: East Coast, Mauritius
Posts: 391
My Ride: 2001 BMW E46 318i
Erratic RPM without starting engine???

My ride: BMW E46 318i
Engine: M43B19

In short:

1. I switch on the ignition (Engine has not yet been started).
2. RPM start bouncing completely erratic. Erratic movement ranges from 0RPM to 6000RPM. It stops after a few seconds. ASC light turns on.
3. I try starting the engine. It cranks but won't turn on.
4. I let the car rest for a few minutes. Then I try turning the engine on again. It starts normally.
5. Try to pull out fault code: It says "Camshaft Position Sensor".

The problem repeat itself every 2 or 3 days.

Question for you dear fanatics is: Have you ever experienced these symptoms with a defective camshaft position sensor? Will replacing the camshaft position sensor solve the problem? It should be replaced for sure but I need to know whether I should replace other parts that are not showing up on the OBD scanner.

Thanks for your help.

Last edited by benzedid; 08-07-2012 at 02:08 PM.
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cps, dme, m43b19

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