Throttle Position Sensor Problem? Revs cut to tick-over intermittenly when driving. 2001 E46 325ti

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Thread: Throttle Position Sensor Problem? Revs cut to tick-over intermittenly when driving. 2001 E46 325ti

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  1. Throttle Position Sensor Problem? Revs cut to tick-over intermittenly when driving. 2001 E46 325ti 
    #1
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    Hi all -need some help please. When accelerating up a hill the other day the car revs dropped but the engine didn't cut out. Then at work yesterday I started the car to go home - tried revving the car (got nothing) switched the engine off and back on (everything fine) until I drove up another hill (the revs dropped) pulled over, pulled off again everything fine. It hasn't thrown up any faults on the dash and unfortunately I don't have a diagnostic tool although I may be able to borrow my dads tomorrow. Not a mechanic so any help on locations of the said parts would be helpful. Thanks
     
     

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    #2
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    dailydoggy's Car Details
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    yep common fault but yours has valvetronic so it could be a valvetronic position fault it needs scanning...
    330i sport a big chunk of berlin...

     
     

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    eclat2008 (09-02-2014)

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    I hooked it up to my dads Carsoft earlier - the software was playing up but I managed to get out what looks to be a cam position sensor fault (I suspected this already as i had the exhaust cam sensor replaced so this must be the intake that's playing up) and what looks to be a mass air flow sensor problem (it was all written in German). Could it be possible that the throttle position sensor is faulty but the ECU hasn't picked it up? If the potentiometer is slipping then it doesn't think there is a problem as it just thinks I've let off the pedal? I will probably get another second hand pedal as it seems the cheapest option unless anyone else has any ideas. Could I rule out the valvetronic if this is the case?
     
     

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    got an ODB scanner today, scanned it before I fitted the new accelerator pedal. code P0102 MAF sensor A circuit low input and P0369 Cam Pos sensor B bank1 circuit intermittent. Fitted the new pedal - still the same fault. on a 10 mile trip to check the car - the revs dropped once when doing about 50mph on the flat. I really don't think it has anything to do with the other codes (when I was at work and pushing down on the pedal the other day the revs stayed constant at tickover until I switched the engine off and bak on) and think it may be the electronic throttle body. One more thing - the cruise control is no longer operational and the outside air temp sensor failed to -40degC a few weeks ago (another job) Bring back the old days of cables and levers and minimum creature comforts. Any advice would be appreciated before I find the biggest hammer I can in the shed and re-arrange the body panels into something less aesthetically pleasing
     
     

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    ya need to address the cam position thing it could of jumped the timing or be a dodgy sensor...
    330i sport a big chunk of berlin...

     
     

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    Cheers Dailydoggy, I've just been trawling through the internet - even found a couple of old posts that you wrote a couple of years ago saying that when they do go its usually on the TB itself rather than the pedal. I will get a new cam sensor ordered as it needs doing anyway. I take it the P0369 code relates to the easy one? (the exhaust) if the cam sensor doesn't fix it then is there any advice on the TB replacement?I've heard it may take 3-4 hours? I will have a go at it although I'm no mechanic.
     
     

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    the throttle body on a valvetronic is only used at tickover and cold start any interaction off the throttle pedal above tickover it goes wide open and converts to the valvetronic.i beleive for throttling..
    330i sport a big chunk of berlin...

     
     

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    eclat2008 (11-02-2014)

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    Cheers Daily - I've just looked under the bonnet though and it has the vanos system (apparently it was the 4 cylinder models that had the valvetronic) I can see the solenoid.
     
     

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    sorry my bad i thought you had an n42 engine for some reason...


    you have an M54 engine in that case im your man ide suggest getting INPA its great for diagnosing problems o these engines...but ide address the cam sensor fault first...


    good news is these engines are bullet proof and rarely cause any serious trouble...if it cuts to tickover when trying to rev it or bounces on the revs its likely to be a cam sensor or throttle position sensor...
    330i sport a big chunk of berlin...

     
     

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    eclat2008 (11-02-2014)

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    Don't worry about it doggy - It's been educational and I'm glad for the free advice I should have realised when you said valvetronic originally I just thought that it was a version of the vanos or something. I will get a new sensor ordered in the morning anyway and then look into the INPA. Thanks for your help - its appreciated!
     
     

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