E46 318 Cars playing up again :(
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  1. #1
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    Cars playing up again :(

    I dont think it is anything major thank god but, i am under the suspicion that the car needs a new crankshaft sensor as I have had the cam sensor replaced but I am still getting the camshaft sensor code. I have been told the crankshaft sensor can cause this. Now I am not going to replace that until it breaks

    So heres the problem, over the past couple of days now and again when I am sat in traffic the revs will stay around 800rpm then for a second drop to under 500 and nearly stall the car, not really fussed about that but today it started happening now and again whilst driving

    I was cruising up the a66 at about 70 mph and the car jerked as though it was going to stall, just like bunnyhopping when you cant use your clutch properly it happened for a second then went back to normal, it also happened when I was cruising at around 30 mph in town, just a slight jerk then back to normal.

    Could this be down to the crank sensor? any ideas?

  2. #2
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    Quote Originally Posted by Lee_h View Post
    I have been told the crankshaft sensor can cause this.
    Can't say i've heard of this
    When you replaced the cam sensor, was it a genuine one, brand new ?

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    yeah, I replaced it with an aftermarket part and that lasted all of 2 minutes so I replaced it with one from bmw hereford

    Its strange, the car just jerks like it wants to stall, fuel pump?

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    Quote Originally Posted by Lee_h View Post
    Its strange, the car just jerks like it wants to stall, fuel pump?
    Many things can cause what you're describing. But if I was you, I'd concentrate on why you still have a code logged for the cam sensor. Maybe someone else has heard of the crank sensor causing issues with the cam sensor ?

    Check the connection for the cam sensor is clean and dry (not full of water from the coolant 'leak'). If you have some electrical cleaner, then give it a clean to make sure it's not adding resistance to it. Follow wiring back as far as possible to see if you can see any damage to the wiring.

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    On my Vectra I used to disconnect the cam sensor totally as when it was playing up the car would cough splutter etc, because sometimes the car couldn't tell if it was the cam or crank sensor. With cam sensor disconnected car ran fine in limp mode (rev limited) If it had been my crank sensor it would have still coughed
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    Quote Originally Posted by Ferret View Post
    Many things can cause what you're describing. But if I was you, I'd concentrate on why you still have a code logged for the cam sensor. Maybe someone else has heard of the crank sensor causing issues with the cam sensor ?

    Check the connection for the cam sensor is clean and dry (not full of water from the coolant 'leak'). If you have some electrical cleaner, then give it a clean to make sure it's not adding resistance to it. Follow wiring back as far as possible to see if you can see any damage to the wiring.
    Yeah I was told by a BMW specialist that a crankshaft sensor can through a camshaft code if its on its way out, he said not to bother replacing it yet though.

  8. #8
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    One thing people forget is a cam sensor code doesn't necesserily say cam fault, it can indicate an issue anwhere between the cam sensor and ECU. Additionally the connector that goes on the sensor may need a contact clean
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    Lee
    Check the crank sensor has not got any dirt on it, as they do pick up some heavy crap

  10. #10
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    Quote Originally Posted by Raffa View Post
    Lee
    Check the crank sensor has not got any dirt on it, as they do pick up some heavy crap
    Next question is then, where do I find the crank sensor?

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