Question about BMW Z3

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FAULT CODES PO170,PO301 ARE COMING UP ON A 2000 BMW Z3 WITH A 2.5. ENGINEB RUNS ROUGH AND IDLE IS'NT STABLE. WHAT IS THE DIAGNOSTICS FOR THIS?

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  • jeffmiller90 Apr 29, 2010

    Now I'm getting a P1189, P1188. WHAT IS GOING ON HERE?

  • jeffmiller90 Apr 30, 2010

    OK THANK YOU. I FOUND A SPLIT IN THE 3" hose that is between the mass air flow sensor and throttle body, so that is sucking in fresh air after the mass air flow sensor has done its thing

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  • BMW Master
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P0301 is a misfire on number one cylinder that is the rough running, as to what the source of that is will require a thorough diagnosis, it is not cut and dry and it can be a multitude of things causing the miss, start with the ignition system, poss causes are in order of how common it is
1. Defective spark plug
2. Defective ignition coil for #1 cylinder
3. Intake manifold vacuum
4. Defective fuel injector cylinder #1
5..Defective #1 fuel injector driver circuit of Powertrain control module
6.. Engine mechanical problems, low compression due to scoured cylinder or burnt valve or flat cam shaft lobe etc..

P0170
Fuel trim lean, the unburned fuel from #1 cylinder misfire going out the exhaust is causing this problem I think, but it could be be the MAF (mass airflow sensor) sensor, I suggest u isolate the problem with the #1 cylinder and repair it then clear the codes and drive it, if the light comes back on and the code P170 comes back try cleaning the MAF sensor, many times that cures the problem.

Posted on Apr 29, 2010

  • yadayada
    yadayada Apr 29, 2010

    you need to seek the help of a trianed electronic engine control specialist, you have serious problems here.

  • yadayada
    yadayada Apr 29, 2010

    both these codes are fuel mixture control codes and are related to the misfire, get the mis fixed and reset they most likely will not come back

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