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  1. #1
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    Member No: 122805 bobg528it is an unknown quantity at this point bobg528it's Avatar
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    Misfire Problem

    Hello All,
    I have a bit of an issue on which I would appreciate suggestions. The patient: 2000 528iT auto w/ 184K miles.
    My wife has recently been driving it with the CEL on for a few weeks (why she did not tell me is anyone's guess). When I hooked it up to my AutoEnginuity scanner (w/ BMW software) it read out as an exhaust CPS code. I replaced CPS with new dealer part and it ran well for about a day. The stumbling returned but not the CPS code, instead I got cylinder 3 & 5 misfire codes along with fuel level too low codes & fuel control codes. I pulled the coils and tested them on a multimeter and they checked out OK. Since the plugs and valve cover gasket were due, I changed them. I put everything back together and it still ran like crap. The most recent codes I got from the scanner are as follows:
    P1250 Fuel Level Too Low
    P0300 Random/Multiple Cylinder Misfire Detected
    P0306 Cylinder 6 Misfire Detected
    P0303 Cylinder 3 Misfire Detected
    P0305 Cylinder 5 Misfire Detected
    P0302 Cylinder 2 Misfire Detected
    P1189 Fuel Control (Bank 2 Sensor 1)
    P1188 Fuel Control (Bank 1 Sensor 1).
    The O2 sensors are relatively new. The fuel pump and cats are original. Any suggestions?

    Thanks,
    Bob
    Boston
    '00 528iT
    '03 530i


  2. #2
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    Member No: 119706 Bmw540san is on a distinguished road Bmw540san's Avatar
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    How about fuel filter. It might be clogging

    causing fuel starvation.



    1998 BMW 540i 6 speed
    Arctic silver, M sport suspension (euro delivery), prod. date 05/98, non VANOS
    Staggered 18" style 32 OEM wheels
    3.15 open differential
    Remus exhaust
    AFE CAI with improved heat shield
    Z3 shifter
    VDO oil pressure and temperature gauges in place of headlight/fog switches
    Powder coated valve covers-satin black
    CDV delete
    Debadged
    AEA DRL module (aftermarket daytime running lights)

    1997 BMW 528iA
    Alpine white, premium package, prod. date 04/97, single VANOS
    Staggered 17" style 32 OEM wheels
    Debadged
    AEA DRL module
    Custom made sun blinds for rear seating area

    2000 Nissan Frontier Desert Runner, AKA "The Work Horse"

    Garage aids:
    Direct Lift Pro Park 8
    Campbell Hausfeld 28 gallon oil lubricated air compressor
    Newair ACP-1400H portable air conditioner and heater
    Auto Enginuity scan tool with BMW enhanced option
    Actron 9135 scan tool-for quick readouts



  3. #3
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    Member No: 122805 bobg528it is an unknown quantity at this point bobg528it's Avatar
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    Re: How about fuel filter. It might be clogging

    Thanks for the suggestion BMW-san. It could be as the current filter has 70-80K on it and my wife is known to run the tank low. Plus, a bad filter would not have a specific code associated with it.

    Bob
    Boston
    '00 528iT
    '03 530i

  4. #4
    Vin M
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    Also, do a fuel pressure test...

    You could have a weak fuel pump that is just starting to fail.

    Vin

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