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Thread: 1992 525i project runs rough

  1. #11
    Join Date
    Dec 2003
    Location
    PA
    Posts
    5,403

    Default

    When we talk about intake gaskets, we are talking about injection molded rubber/plastic ones. You will NEVER seal an M50 intake manifold correctly trying to use silicone.




    six of those

  2. #12
    Join Date
    Aug 2006
    Location
    Kansas City, MO
    Posts
    45

    Default

    Jon is right, save yourself a lot of work and heart ache by just picking up some new gaskets. They are pretty cheap too.

  3. #13
    Join Date
    Jan 2007
    Location
    Southeast Texas
    Posts
    16

    Default

    Thanks ya'll.
    I couldn't stand it so I tore it down. The seals were pretty flat. I didn't have new ones yet so I turned them over. The inside edge still had a nice ridge on it which stuck out from the manifold. No difference in performance. I have new seals ordered but I think these are probably sealed for a while.
    I put 40# of air pressure on the fuel rail & energized the injectors. All had a great spray & did not leak. I know ,I could have blown myself up but I was careful & only blipped the injectors.
    Again it runs worse when warm if that's any clue. A friend has an ultraviolet thermometer. I am going to check for a cold cylinder. It is not backfiring like it was. I wasn't bad before. I guess it feel like more of a missfire.
    Should I have it diagnosed by a machine?

  4. #14
    Join Date
    Jan 2007
    Location
    Southeast Texas
    Posts
    16

    Default

    Could an O2 sensor be causing my grief. Temp sensor? TPS? I checked it with a meter but I guess it could still be a wrong readind for the car.

  5. #15
    Join Date
    Jan 2007
    Location
    Southeast Texas
    Posts
    16

    Default

    Could an O2 sensor be causing my grief. Temp sensor? TPS? I checked it with a meter but I guess it could still be a wrong reading for the car.

  6. #16
    Join Date
    Apr 2006
    Location
    Chicago, Il. U.S.A.
    Posts
    4,243

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    Sounds lean to me. Look for vacuum leaks.
    Any pinging or noises on throttle opening?
    "The gas pedal wouldn't go to the floor if it weren't meant to be there"

  7. #17
    Join Date
    Dec 2006
    Location
    San Jose, CA
    Posts
    113

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    Is piniging a sign of leaning out? I don't often 'step on it' on my car, but did the other day, sort of testing things - and noticed when the RPM was around 5K there was lots of pinging, so I let up and it stopped. Could this be a sign of leaning / the O2 sensor being bad?

    sc
    scott 4991
    535i, 172K miles

  8. #18
    Join Date
    Jan 2007
    Location
    Southeast Texas
    Posts
    16

    Default

    There has been no pinging. I guess I need someone to put an exhaust gas analizer on it.

  9. #19
    Join Date
    Jan 2007
    Location
    Southeast Texas
    Posts
    16

    Default repairs

    I finally put the new intake gaskets in as well as injector seals & valve cover gaskets. The car seems to run better but still not 100%. I've unhooked the battery until tomorrow. I'll drive it tomorrow & let it remap. It still seems like a closed loop issue. It runs pretty good when it's cold. I'll update.

  10. #20
    Join Date
    Sep 2006
    Location
    Colorado
    Posts
    143

    Default

    You car sounds very similar to mine. But, mine does it worse when it is cold.

    I replaced my intake gaskets, intake boot, and a number of hoses under the intake, cleaned the ICV, and it does seem to run better. Read a posting by another user here that was having similar issues and his problems were solved by replacing the DME, ie engine computer.

    These early M50s seem to be very picky about running smoothly...

    Just my $.02

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