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Thread: What Could This Be Related To....

  1. #1
    Join Date
    Sep 2005
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    Central Coast, CA
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    Default What Could This Be Related To....

    I notice that sometimes when I press on the gas pedal there is a slight delay then all of a sudden there is the acceleration i was looking for

    this usually happens when I am at very low speeds or even from a stop

    I have changed the fuel filter about 20K ago
    The fuel Pump around 30-40K ago
    The air filter around 20-25K ago
    The spark plugs around 30K ago (Bosch +4...could that be the problem?)
    I use premium gas

    any thing else it could be? Any suggestions?

    thanks guys!
    http://www.bimmernut.com/forum/image.php?type=sigpic&userid=3314&dateline=1239168  877

  2. #2
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    Vacuum leak. AFM needs checking. Fuel pressure issue, pump or regulator. gooey injectors.

    1990 535im 421,000 miles, 1987 325is, 1989 325is, 1990 m3, 1991 318is, 2001 X5 3.0

  3. #3
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    Quote Originally Posted by ahlem View Post
    Vacuum leak. AFM needs checking. Fuel pressure issue, pump or regulator. gooey injectors.
    EWWW!

    that does not sound fun at all!

    How do check these issues?
    http://www.bimmernut.com/forum/image.php?type=sigpic&userid=3314&dateline=1239168  877

  4. #4
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    Pretty sure everyone suffers this. Its mainly due to AFM design as its the vane type, which has the little flap that has to open when more air is sucked in. This is an old style way of metering air that goes into the engine, a Miller MAF uses a hot wire which senses the amount of air but with no lag as there is no flap anymore, so maybe investing some money into one of them is a good idea.

  5. #5
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    Quote Originally Posted by ArnZ! View Post
    Pretty sure everyone suffers this. Its mainly due to AFM design as its the vane type, which has the little flap that has to open when more air is sucked in. This is an old style way of metering air that goes into the engine, a Miller MAF uses a hot wire which senses the amount of air but with no lag as there is no flap anymore, so maybe investing some money into one of them is a good idea.
    His is an M50 motor with wire MAF though, surely?

  6. #6
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    let me ask you guys this... is it worth doing the fllowing;

    change plugs
    air filter
    fuel filter
    throw in some injection cleaner (but i use 91 as it is =/ )
    http://www.bimmernut.com/forum/image.php?type=sigpic&userid=3314&dateline=1239168  877

  7. #7
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    Quote Originally Posted by Ferret View Post
    His is an M50 motor with wire MAF though, surely?
    You sir seem to be correct! sorry BMW4LIFE my comment is only good for the m30 and m20 motors then.

  8. #8
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    Quote Originally Posted by BMW4LIFE View Post
    let me ask you guys this... is it worth doing the fllowing;

    change plugs
    air filter
    fuel filter
    throw in some injection cleaner (but i use 91 as it is =/ )
    My E31 was stuttering as it came off idle a bit, changed the plugs and it went away...

    However it could be a lot of things other than this as well.

    Plug change is always worth it

  9. #9
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    I think it is because of electronic throttle control. The lag. When I stomp on the accelerator... it seemed like 1 second before all hell broke loose in a good way. LOL

  10. #10
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    Quote Originally Posted by BMW4LIFE View Post
    let me ask you guys this... is it worth doing the fllowing;

    change plugs
    air filter
    fuel filter
    throw in some injection cleaner (but i use 91 as it is =/ )
    Didn't I already tell you to pull out those +4's you've got in there and at least put the proper OE plug in, if you didn't want to give the E3 plugs a go?

    Air filter is way past due for a change.

    Fuel filter could be changed out by now.

    And yeah, I'd go ahead and run a bottle of Techron through the engine. Don't care if you use 91 or not. A little Techron every now and then (or better yet Seafoam in the gas) is good to clean things up a bit.

    Would put Techron or Seafoam in the tank, and change plugs right after you fill up with the Techron/gas or Seafoam/gas mixture. That way it'll burn the cleaning mix better. Change the air filter at the same time.

    Then once you've gone through the tank with the fuel system cleaner go ahead and change out the fuel filter.

    New air & fuel filters as well as new (and proper) plugs will certainly help it run smoother. If it's still a little off then you can start looking at other possible culprits.
    Cosmos Black/Black 1995 540iA M-Sport
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