E46 318 N42 engine problem could be cam sensor?
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  1. #1
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    N42 engine problem could be cam sensor?

    Hi all, first post in these pages,

    So I'm trying to sort a noisy engine out!

    I've swapped the cam chain tensioner for the upgraded bmw one, and that has stopped the noise on initial startup (like a bag of spanners is in the engine...) but while I had the engine covers off I noticed a big piece of gaffer tape over sensor next to the oil filler cap (which I thought was the cam sensor, but not sure now). Now since replacing the tensioner and messing with the gaffered sensor shes really down on power, especially in lo revs.. I've plugged my scanner up and getting the P0366 cam position sensor B bank 1 CKT range/performance code.
    Also I've fitted a used back box today...but cant see how that would have anything to do with it.. Think replacing the sensor will sort it?? They're not cheap so want to make sure..

    Ok after a bit of digging i have found that one of the cam sensors is down by the cam chain tensioner, so will check i have not knocked the wiring or something.. Still not sure what the sensor is between to the filler cap and coil pack tho...


    Thanks in advance.

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    You have 2 cam sensors either side of the vanos solenoid. One of them does lie under the oil fill.

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    avoid cheapo aftermarket ones...genuine are either siemens or bosch which can be bought at some places cheaper than the dealers...

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    Quote Originally Posted by NealP View Post
    You have 2 cam sensors either side of the vanos solenoid. One of them does lie under the oil fill.
    thanks for this, the one thats been gaffered up is actually on the rocker cover between the filler cap and 1st coil.. sorry should have been more clear.. but i dont know what this sensor is. Something to do with the VVT motor?

    This forum is awesome.

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    Can you take a pic of it and post it up? If it's anything to do with the VVT motor, then it could be the ecentric shaft sensor.

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    yep here it is below. I just wiggled it and it came out in my hand, so have re-gaffered it in, you can see teh white where the okld gaffer was holding it.. its got a load of pins on it and is one of those you think really should stay where it is!
    I've re-plugged the cam sensors re attached the sensor on the top and its still really down on lo end power.. almost like a diesel waiting for the turbo! Still giving me code P0366, It also sounds weird, like really beafy on the manifiold exhaust. I really hope the chain hasnt jumped when i fitted the new tensioner :( Attachment 2608

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    the more i think about this the more I think the chain has jumped.
    Am going to take the cam cover off and check. Any pointers on what cams should be where when at TDC?

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    noisy exhaust note is indicitive of the wrong cam position or a dodgy cam sensor the cam cannot position correctly ive heard it before on forums it gives rather a deep exhaust growl...

    these engines are notorious for cam chain jumping and the exhaust side vanos sticking aswell which can also invoke a chain rattle aswell..

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    Not a good day! Gonna give it to a friend who has all the proper BMW diagnostics equipment and see what he can make of it. Thanks for all your help so far.

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    well after a lot of fannying about I ended up having to pay someone 160 to re-set the timing. Didnt fancy it myself.. thought that was quite steep really but he's a BMW specialist and at least the thing is back on the road!
    All in all one big pain in the ass!

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