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Thread: not really an E34 question... but BFC doesnt seem to help

  1. #1
    Join Date
    Aug 2005
    Location
    Newton, MA
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    538

    Default not really an E34 question... but BFC doesnt seem to help

    M42 - when i rev it past 4k RPM, it stumbles and the revs oscillate from 4000-4200 RPM very quickly, if you are in gear the car jerks badly forward and brakes - engine literally stumbles. Happens at any speed in any gear.

    What would be the case for that? Does anyone know?

    -Thanks, Artem

  2. #2
    Join Date
    Apr 2006
    Location
    chicagoland USA
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    these are just complete guesses, but as no one has chimed in yet, food for thought.

    coil packs- make sure you have spark to all cylinders.

    slack in timing chain or belt

    bad gasoline or bad air fuel ratio

    beyond that I am stumped.

  3. #3
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    Aug 2005
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    Newton, MA
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    The chain one would be realy bad, may need to accelerate in terms of acquiring a new tensioner. I put the "plus fuel in there - 89 octane" Would that be bad for it? I am almost certain it had issues with the Premium as well.

    I can also clean the coil packs, but the car seems to run very smooth othervise - smoother than my E34 when it was missing on a cylinder.

    I really didnt want to do anything to the car until in about 2 weeks, but I need to figure this out - i dont want to kill the engine right away. I wanted to refresh it later, swap everything and ll flids, etc.

    Slithly OT: Anyone has cool rims foe sale that fit the 4x100 bolt pattern? With new tires hopefully I need to get new tires, but it will cost me around $200 altogether, I was hoping to get a new set of rims with relatively new tires for that much.

    -Artem

  4. #4
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    Aug 2005
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    Newton, MA
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    Also - the fuel delivery seemed like the most obvious problem to me, I think the engine just refuses to rev past that often.

    Also the car sounds pretty loud.

    (If all that helps)

    -Artem

  5. #5
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    Apr 2006
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    chicagoland USA
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    not sure about the rev issue like I said, but you may want to check your nearest big citys craigslist for wheels, I have seen alot of great deals on there in chicagoland.

  6. #6
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    Aug 2005
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    Newton, MA
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    Thanks man I will do the CL thing about the wheels - havent seen any good ones there lately though.

    I know i need to give the car a tuneup but just how long can i run it with the problems... That I do not know. Wish i did

    I would really hate the engine to break on me somewhere halfway before the break..


    -Artem

  7. #7
    Join Date
    Jul 2006
    Location
    Albany, NY
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    Does it happen at partial throttle or only full throttle? Sounds like you might be running very rich. Did you recently make a change or did it just start happening?

  8. #8
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    Newton, MA
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    I just got the car and it started happening as soon as i got it - so I dont know.. It happens at full throttle. (Full throttle only)

    -Artem

  9. #9
    Join Date
    Dec 2003
    Location
    Eastern Tennessee USi
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    change the fuel filter(s) and if the problem persists check fuel pressure
    95 E34 530I V2.37
    ===========
    Those who make peaceful revolution impossible will make violent revolution inevitable.

    John F. Kennedy

  10. #10
    Join Date
    Aug 2005
    Location
    Newton, MA
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    Will do asap - fuel filter is easy.

    If the test tmr will go well, i will go it after the test tmr.


    -Artem

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