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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
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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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Old 08-08-2012, 11:43 PM   #2
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Join Date: Jan 2006
Location: Cyprus
Posts: 6,580
My Ride: ESS TS2 320ci
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
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Join Date: Jan 2011
Location: East Coast, Mauritius
Posts: 391
My Ride: 2001 BMW E46 318i
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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Location: Canada
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My Ride: 2005 bmw m3
True but lots of electronics are linked together through f... In computers.
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Old 10-03-2012, 10:07 AM   #5
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Location: France
Posts: 58
My Ride: E46
Maybe you can test your battery. Low battery charge can cause such funny things
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Old 02-05-2013, 07:58 AM   #6
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Location: East Coast, Mauritius
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My Ride: 2001 BMW E46 318i
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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cps, dme, m43b19

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