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Thread: Failing smog by amile, waaay too rich

  1. #1
    Join Date
    Jan 2013
    Location
    Aurora, Co
    Posts
    23
    My Cars
    1986 BMW 635csi

    Failing smog by amile, waaay too rich

    Also posted on E24 forum

    My 86 635, 99,000 miles has been failing smog tests on being too rich.Car idles badly too high and erratic.
    I have checked all the usual suspects, discoed cold start valve, have swapped AFM for known good one, CTS, ICV, on and on.

    Can get it to run if I pull and clean plugs and let it air out.
    One mechanic said drippy fuel injectors ( changed ), another said new 3.0 fuel pressure was running at 2.5 bar, changed back to original Bosch 3.0, still way rich.

    I'm stuck on this one, all 6 plugs ( correct ) are equally black and wet ,shouldn't be injectors.

    Any ideas?
    I'll remember you in my will!

    Jim

  2. #2
    Join Date
    Sep 2009
    Location
    Denver, Colorado
    Posts
    2,876
    My Cars
    1985 535i, 1980 635CSi
    Jim,

    I don't remember you saying-- did you ever try a spare ECU?

  3. #3
    Join Date
    May 2014
    Location
    Aurora,Co
    Posts
    93
    My Cars
    1986 635csi 2001 530i
    Tom, I tried ECU from buddies identical car, his ran perfect changed to my car and no difference.

    Still having problems, smoke test with bee smoker and also smoky seafoam test revealed no air leaks.
    However TPS, which normally doesn't go bad I hear, seems to be giving me bad readings.

    Ohm test:
    Idle ohms should be 2.0 actual is 4.2
    Floored ohms should be 10 actual is .62

    Voltage test
    Idle volts should be .7 increasing to about 5.0 when floored.
    Idle actual is 4.52 decreasing to .9 when floored.

    This TPS ( 1986 auto ) is the one with a rubber boot and Bosch part 0261211001 for the potentiometer.

    I would dig into the ECU as soon as I find out which ECU pin is getting the reading from the TPS to double check.

    Now I'm stuck, there seems to be one for sale in the entire universe and mightily priced at $150 used.

    Anybody else run into this??

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