Crank position sensor

Vertuas · Aug 21, 2013

Was told that that changing the crank sensor (2001 TD4) was a matter of taking a bolt out, swapping the sensor and bolting it back in. Getting the bolt back in the hardest part.

Just had a look at the car, I cannot even see the crank sensor. Looks like the air duct, and inlet manifold have to come off for access, then the start has to come off out the way.

Has anyone changed one?

If this is the case..........

While manifold is off, may as well get some Mr Muscle in it. While the started is off, may as well fix the soleniod

Nodge68 · Aug 21, 2013

Does the engine run? If so the CAS is fine.

Vertuas · Aug 21, 2013

Nodge68 said:
Does the engine run? If so the CAS is fine.

It runs, up to 3000 rpm. once it gets there is drops to 2000, 2500 rpm with a puff of smoke out the exhaust.

Its autobox, drives OK if lacking some power in D unless it gets to 3000 rpm then has a fit. In sports its useless, as it tries to rev over 3000 rpm.

Changed turbo actuator, no difference.

No helicopter light (engine check / MIL). have code read, fault crank position sensor.

Cleared the code, ran it again. same fault code.

Nodge68 · Aug 21, 2013

If it's logging the CAS as faulty then I guess it is. The CAS is in the front of the bell housing just to the left of the valve block cover on my V6 but I'm not sure on the TD4

Vertuas · Aug 22, 2013

Well who knows, its a place to start.

Maybe it doing it spaz thing and the next pulse from the sensor does not come in time as the engine cut out. So the ECU logs a crank sensor error.

Maybe the sensor is buggered and cannot cope with the frequency any more.

Maybe its not even in injection issue and the exhaust is blocked, the back pressure gets to high at near 3000rpm.

It's a big BMW mystery.....German engineering my arse!!!!

Nodge68 · Aug 22, 2013

Vertuas said:
Well who knows, its a place to start.

Maybe it doing it spaz thing and the next pulse from the sensor does not come in time as the engine cut out. So the ECU logs a crank sensor error.

Maybe the sensor is buggered and cannot cope with the frequency any more.

Maybe its not even in injection issue and the exhaust is blocked, the back pressure gets to high at near 3000rpm.

It's a big BMW mystery.....German engineering my arse!!!!

If the CAS is of the inductive type they can break down at higher RPMs although I'd have thought that it would be the modern active type. Best be is change it and see what happens?

englishbullterrier · Aug 22, 2013

Change it as a diagnostic check, then you may rule it out...........

Vertuas · Aug 25, 2013

Part changed, the issue has gone away, can now rev above 3,000 rpm

Crank position sensor

Vertuas

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Nodge68

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Vertuas

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Nodge68

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Vertuas

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Nodge68

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englishbullterrier

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Vertuas

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