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-   -   Erratic RPM without starting engine??? (http://forum.e46fanatics.com/showthread.php?t=937454)

benzedid 08-07-2012 03:03 PM

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.

paraklas 08-09-2012 12:43 AM

Replace the camshaft position sensor. Clear codes, then see if problem appears. Wont do any good at all randomly replacing parts. Your issues may be unrelated as well. Also do a cluster reset it may fix the problem

benzedid 08-09-2012 02:03 AM

Did the cluster test. Everything work fine. Unrelated for sure. I don't see how a camshaft position sensor can be related to the RPM needle. As far as I know, the RPM sensor is usually located on the crankshaft.

Beamer Creamer 10-01-2012 01:55 AM

True but lots of electronics are linked together through f... In computers.

Quenotte 10-03-2012 11:07 AM

Maybe you can test your battery. Low battery charge can cause such funny things :)

benzedid 02-05-2013 07:58 AM

Happened to solve the problem. An OBD scan revealed the crankshaft position sensor was defective too. Replaced both of them. Now it works fine.

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