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b27 Motor Hesitation: Help is much appreciated!

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    b27 Motor Hesitation: Help is much appreciated!

    Hey! so I'm having quite an unfortunate problem with my awesome e30. I have an '87 325 (M20b27) and when I'm driving the car will randomly stop wanting to give me power. It has occurred right from start up and then sometimes it won't do it until a couple minutes into the drive. You can hear what is happening in the video link below. (i posted it on r3v Facebook because i don't have a youtube account).



    VIDEO NOTES:
    when you first hear the "rumbling" I'm flooring it in 3rd, not increasing speed. Then, when i downshift into second, the "rumbling" stops momentarily and starts again.
    Also, you can see the dash for a few seconds in the video. The speedo is pretty accurate (within 5 mph). However, I have a super-eta tach in my not-super-eta, so there's some error in that too.

    This weekend i took a look at the distributor and it looks super clean. However, I'm still thinking of replacing the distributer cap, rotor, plug wires, and plugs. What do you think?

    please let me know if you have any ideas. It would be greatly appreciated! before this problem, this car was extremely reliable and i'm about to sell my daily, so it would be great to drive this until i buy a new one! haha.

    #2
    that's a good start. other things might be clogged fuel filter, dirty afm, weak fuel pumps, or bad cps.
    AWD > RWD

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      #3
      is there a way to know if the fuel filter is "weak?" i looked up a video of a failing one and I've never heard a sound like that on my car.

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        #4
        Have you checked the fuel pressure? Your car has two fuel pumps; a low pressure lift pump from the tank, and a high pressure fuel pump above the fuel filter in front of the driver side front tire. A problem with either one can cause drivability problems.

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          #5
          i haven't yet, but i will put that on the list of things to do!

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