GO FISHING, use SLABSAUCE Fishing Attractant
Results 1 to 8 of 8

Thread: Crank / Cam Sensor

  1. #1
    Join Date
    Jun 2004
    Posts
    60

    Default Crank / Cam Sensor

    Hi there,

    I have a vibration/missfire/????? at between 2150rpm to 2800 rpm depending on whether or not the eng is cold, how many tiumes i have started it ???? yes i know sounds . But from one eng run to the next i have very different "power" levels and the vibration shifs ever so little. Sometimes the eng feels dead as a door nail, others a little more lively.

    I have changed the coils, had the vehicle serviced, had a vanos kit installed (BMW bulletin) to make the vanos less noisy (this also seemed to give a better spread to the torque not just a terrible sling shot effect from around 4800rpm,) and G-D knows what else.

    I have had the eng on DIS to see if any faults are stored, nothing!

    I am at my witts end. This damn vibration never lets up and i am sure its the cause of the lack in power in the eng. (Mabe i do need an M5 as recogmended by my mechanic.... LOL)

    He suggested last night that mabe the Crank sensor is faulty and that at that rpm it is experiencing a vibration or it is not sending the correct signal just then, mabe even the cam sensor or both ???

    Any ideas ????

    Thanx


    '94 525im (euro Spec)

  2. #2
    Join Date
    Dec 2003
    Location
    Eastern Tennessee USi
    Posts
    14,839

    Default

    I actually have no clue but I would usually think a faulty crank/cam sensor would either work or not work. Have you done a compression test? It sounds to me like one cylinder is causing havoc with you. Maybe you have a dirty fuel injector or bad plug, You didnt mention replacing either so thats where I would go from where you are.
    95 E34 530I V2.37
    ===========
    Those who make peaceful revolution impossible will make violent revolution inevitable.

    John F. Kennedy

  3. #3
    Join Date
    Jun 2004
    Posts
    60

    Default

    Hey Jeff, thanx for replying.

    Yeah i also considered the injectors or an injector. Plugs keep getting fouled with oil, apparently my eng keeps blowing the tappet cover seal, had it replaced one service back but it has done it again. I then said that the oil on the plugs was the prob, but my mac says that it wasn't sufficient to cause the prob.

    Actually i forgot abt that, mabe there is some relation to y the gasket keeps blowing and the missfire/vibration

    Any thoughts ???

    Thanx again, u'r help is much appreciated.

  4. #4
    Join Date
    Jan 2004
    Location
    Benneton (United Colors of)
    Posts
    3,067

    Default

    IF THE valve cover keeps blowing, i'd check the plug wells for oil, that might cause the problem you describe. it did when i detailed my engine and willed the wells up with water oil could do something similar.
    "..Torchinski v. Peterson that it is legal to carry a concealed weapon, so long the weapon is totally slick like a huge ass machine gun that you carry under a trench coat, like in the Matrix."


  5. #5
    Join Date
    Dec 2003
    Location
    Eastern Tennessee USi
    Posts
    14,839

    Default

    ahhh! lots of crankcase pressure hmm... that could be from a bad cylinder. Either a bad fuel injector (cant see if their clogged inside) a bad wire/boot or plug may cause the blowby needed to pop out gaskets. Wose case scenereo is...nevermind. Try to locate the bad cylinder by comparing the plugs in order and go from there.
    95 E34 530I V2.37
    ===========
    Those who make peaceful revolution impossible will make violent revolution inevitable.

    John F. Kennedy

  6. #6
    Unregistered Guest

    Default i doubt that its the crank sensor

    but if you somehow find that it is I have a brand new one that I am willing to sell to you for a lot cheaper then bmw will (its a $115 to $130 part). I had a problem that I thought was the crank sensor and I bought the part and found i was wrong. Let me know
    tetsuo48@hotmail.com

    tetsuo48

  7. #7
    Join Date
    Jun 2004
    Posts
    60

    Default

    Quote Originally Posted by ryan roopnarine
    IF THE valve cover keeps blowing, i'd check the plug wells for oil, that might cause the problem you describe. it did when i detailed my engine and willed the wells up with water oil could do something similar.

    Hey Ryan. Yeah 2 plugs were fouled with oil on the last service. The mac said that the amount of oil was insufficient to cause the "vibration/missfire" present though couldn't offer an explanation ??

    I really do not know if its my imagination, but i do believe that the eng ran without the said vibration for abt a day or so after the service. Difficult to pinpoint though or say for sure. There are days that it is so faint almost inperceptable and then others its like the eng is gonna fall out or something.


    Jeff thanx also, i concur with what u are saying. My gut also tells me something ain't quite right there. This is the 2nd time the gasket has blown and as far as i am concerned, if it had just "worn" out the first time what gives with 12000km and then it blowing again ? I will have the cylinders compression tested tomorrow and then try to get the injectors to a test bench, take it from there.

    Thanx again for all the input it's really appreciated, this is a damn nucence when u know how smooth the eng is supposed to run, If i had wanted to buy a piece of crap i would have, this is infuriating!

    Tetsu, i will keep u'r offer in mind thanx.

    Cheers

    Victor

  8. #8
    Join Date
    Oct 2005
    Location
    KY
    Posts
    48

    Default

    We are having the same problem with our 95 525i. Replaced MAF, fuel pump, plugs, couple boots, o2 sensor, new gasket, fuel filter, new cats, one was bad. Still have oil soaking the pugs and blowing the gasket and the exact same symptoms you had.

    What fixed your car??????????????????
    Ride safe and ride long!

Similar Threads

  1. crank pos sensor
    By DABLACK in forum 5 Series BMW
    Replies: 3
    Last Post: 03-26-2009, 09:18 AM
  2. Crank sensor problem: A note on Crank sensors
    By shogun in forum 5 Series BMW
    Replies: 7
    Last Post: 01-30-2008, 07:18 PM
  3. Crank sensor
    By eligunn in forum 5 Series BMW
    Replies: 8
    Last Post: 04-13-2005, 11:42 AM
  4. cam/crank sensor
    By sterling in forum 5 Series BMW
    Replies: 1
    Last Post: 01-16-2005, 07:09 PM
  5. crank sensor
    By Unregistered in forum 5 Series BMW
    Replies: 11
    Last Post: 06-20-2004, 09:03 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •