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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 08-07-2012, 02:03 PM   #1
benzedid
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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.
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Old 08-08-2012, 11:43 PM   #2
paraklas
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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
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Old 08-09-2012, 01:03 AM   #3
benzedid
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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.
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Old 10-01-2012, 12:55 AM   #4
Beamer Creamer
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True but lots of electronics are linked together through f... In computers.
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Old 10-03-2012, 10:07 AM   #5
Quenotte
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Maybe you can test your battery. Low battery charge can cause such funny things
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Old 02-05-2013, 06:58 AM   #6
benzedid
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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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