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Thread: MAF Temperature Sensor appears to be dead

  1. #1
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    Question MAF Temperature Sensor appears to be dead

    With the onset of cold temperature my i-spec '86 325 (1989 325i engine) has been giving me issues. About two weeks ago, on the way to work (of course) it began to misfire and then quit running just before I got to a parking place. After work it would not start and I had to tow it home. Today I was finally able to spend some time doing some diagnostics, and discovered on checking the MAF that there is continuity across the connectors to the temperature sensor. In short, it looks like the temperature sensor is dead.

    Will this cause a no start problem?

    The car has had cold start issues for awhile, in that it has to crank a few times before starting and it idles rough when cold and sometimes a bit too fast when warm. This led me to think the cheap Chinese-made IAC was giving me fits, but replacing it made no difference on the no-start issue.

    I already know nobody carries a replacement temperature sensor for the air flow meter, and this probably means I will have to replace the entire AFM. I just want to be sure it is why the car won't start before I drop the bucks. I can't afford to throw money at it.

    For the record, the IAC is brand new and TPS is only about a year old and test within specs. The coil is also within specs and the spark plug wires are less than three years old. Static fuel pressure is a solid 40 psi, and while I haven't measured it, flow seems to be excellent. The O2 sensor may be dying, but I'm not sure. I have been wondering for awhile if the AFM has been dying a slow death. At somewhere in the neighborhood of 300,000 miles, that is a possibility.
    The Neighbors Boy
    Terrorizing America's highways and byways since 1975.

    Daughter's car: 1984 325e coupe
    Wife's car: 1986 325 sedan, now featuring an i-spec engine!
    My vehicle: 1954 Ford F250


  2. #2
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    Does the coolant temp sensor check out ok?

  3. #3
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    http://www.clarks-garage.com/shop-manual/elect-22.htm

    Hopefully the link works but I just used this to test my AFM

  4. #4
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    Quote Originally Posted by msservices View Post
    Does the coolant temp sensor check out ok?
    Yes.

    - - - Updated - - -

    Quote Originally Posted by BMWBurnout875 View Post
    http://www.clarks-garage.com/shop-manual/elect-22.htm

    Hopefully the link works but I just used this to test my AFM
    I used the instructions in the Bentley manual, which are pretty much the same. That is how I concluded the air temperature sensor was dead. (Funny thing, I had forgotten about that website. I actually have it bookmarked!)
    The Neighbors Boy
    Terrorizing America's highways and byways since 1975.

    Daughter's car: 1984 325e coupe
    Wife's car: 1986 325 sedan, now featuring an i-spec engine!
    My vehicle: 1954 Ford F250


  5. #5
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    e24e30e36e39e90
    Does your car have the Pac-Man diag inteface? I was able to read the code for failed AFM temp sensor on my 1990 vert with my Peake.

  6. #6
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    [QUOTE=sienayr;30164329]Does your car have the Pac-Man diag inteface? I was able to read the code for failed AFM temp sensor on my 1990 vert with my Peake.[/QUOTE

    No, doggone it.
    The Neighbors Boy
    Terrorizing America's highways and byways since 1975.

    Daughter's car: 1984 325e coupe
    Wife's car: 1986 325 sedan, now featuring an i-spec engine!
    My vehicle: 1954 Ford F250


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