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Thread: 2 months work,2nd mechanic, still no better than I started. I don't want to spend any

  1. #1
    Join Date
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    2 months work,2nd mechanic, still no better than I started. I don't want to spend any

    Vehicle 2002 BMW 745I

    Codes p0363

    Check engine light on, car data indicates emissions fault malfunction

    1. I replaced spark plugs
    2. Replaced ignition coils
    3. Crankcase ventilation
    4. Valve cover gaskets

    What could it be? Please contact me



    Sent from my iPhone using Tapatalk

  2. #2
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    Are you visiting BMW specialist shops? I'd have to doubt that, because you're pointing to an extremely general p-code. P-codes are useless, or worse, in diagnosing your very complex BMW.

    You're chasing general misfires, without any further information. We don't even know which cylinder(s) are misfiring.

    You need to get the car to a good BMW tech. Just so you're aware, the E65 is extremely troublesome, and extremely expensive to maintain.

    If you recently bought the car, I hope that you have a book full of maintenance and service records. It's VERY easy to spend many times this car's value, repairing it.

    All of the elements which you replaced can certainly be regarded as basic maintenance items which were likely long overdue; there will be several dozen more items like that, which need maintenance replacement, too.

    When you have a good BMW tech who can read the BMW specific codes, and also ascertain the circumstances and specifics of when and where the misfires occur.

    How many miles on the car, and what sort of maintenance has it had?

    Chris Powell
    Racer and Instructor since, well. decades, ok?
    Master Auto Tech, owner of German Motors of Aberdeen
    BMWCCA 274412
    German Motors is hiring ! https://www.bimmerforums.com/forum/s...1#post30831471

  3. #3
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    By crankcase ventilation, do you mean the PCV in the front or the 2 diaphragms under the plastic that covers both banks, not the center one. These diaphragms aren't expensive and most non BMW shops don't even know they are there. The reason Chris is telling you about the general uselessness of P Codes is because generic emissions can be anything from secondary air faults to air intake, to whatever. There are secondary air valves, there are clogged secondary air injectors, secondary air pumps... Anyway back to the diaphragms, they are located under black round covers held on by tabs, located toward the front 1/4 of the valve covers, you can use a 90 degree pick to open them up, they are usually orange in color and made of rubber, there is a spring under them, when you take the diaphragm out look for tears in the folds, if they are torn, that's most likely your problem.

  4. #4
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    Quote Originally Posted by bmwdirtracer View Post
    Are you visiting BMW specialist shops? I'd have to doubt that, because you're pointing to an extremely general p-code. P-codes are useless, or worse, in diagnosing your very complex BMW.

    You're chasing general misfires, without any further information. We don't even know which cylinder(s) are misfiring.

    You need to get the car to a good BMW tech. Just so you're aware, the E65 is extremely troublesome, and extremely expensive to maintain.

    If you recently bought the car, I hope that you have a book full of maintenance and service records. It's VERY easy to spend many times this car's value, repairing it.

    All of the elements which you replaced can certainly be regarded as basic maintenance items which were likely long overdue; there will be several dozen more items like that, which need maintenance replacement, too.

    When you have a good BMW tech who can read the BMW specific codes, and also ascertain the circumstances and specifics of when and where the misfires occur.

    How many miles on the car, and what sort of maintenance has it had?
    104k miles
    I have the car fact and it has had the typical replacements and maintenance like fluid changes, alignments and stuff.
    It is misfiring on cylinders 6 and 8.

  5. #5
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    I have taken it to two mechanics who assumed they did know but ended up not knowing a thing. What else might be the issue for this misfiring

  6. #6
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    Quote Originally Posted by ptarditi View Post
    By crankcase ventilation, do you mean the PCV in the front or the 2 diaphragms under the plastic that covers both banks, not the center one. These diaphragms aren't expensive and most non BMW shops don't even know they are there. The reason Chris is telling you about the general uselessness of P Codes is because generic emissions can be anything from secondary air faults to air intake, to whatever. There are secondary air valves, there are clogged secondary air injectors, secondary air pumps... Anyway back to the diaphragms, they are located under black round covers held on by tabs, located toward the front 1/4 of the valve covers, you can use a 90 degree pick to open them up, they are usually orange in color and made of rubber, there is a spring under them, when you take the diaphragm out look for tears in the folds, if they are torn, that's most likely your problem.
    Those orange rubber circles have been checked this morning lol and they are good but I wished they haven't had been it could've been a easy fix. I'm trying to pin point it by cchecking other stuff anything else do you guys might think is wrong with the car?

    So emissions can vary then.

  7. #7
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    Since you know which cylinders are involved, you must have additional codes. Share that with us?

    Are these "dead-misses", or intermittent misfires? (A dead miss, in theory, should be easier to find).

    If the misfires are full-time, first you check spark: Pull the coil pack off a misfiring cylinder, stick a spare spark plug in it, ground the threads, look for spark.
    If you have a good spark, you might want to disconnect the fuel pump fuse, and test compression on, say, all 4 cylinders in bank 2. (Driver's side)
    If that's good, you might want to pull the injector rail, and swap injectors around, see if the codes follow injectors.

    Swapping in new coils and plugs does not guarantee you have spark on 6 & 8. (Might be bad coil-drivers, or bad wiring, etc...)

    Chris Powell
    Racer and Instructor since, well. decades, ok?
    Master Auto Tech, owner of German Motors of Aberdeen
    BMWCCA 274412
    German Motors is hiring ! https://www.bimmerforums.com/forum/s...1#post30831471

  8. #8
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    Quote Originally Posted by bmwdirtracer View Post
    Since you know which cylinders are involved, you must have additional codes. Share that with us?

    Are these "dead-misses", or intermittent misfires? (A dead miss, in theory, should be easier to find).

    If the misfires are full-time, first you check spark: Pull the coil pack off a misfiring cylinder, stick a spare spark plug in it, ground the threads, look for spark.
    If you have a good spark, you might want to disconnect the fuel pump fuse, and test compression on, say, all 4 cylinders in bank 2. (Driver's side)
    If that's good, you might want to pull the injector rail, and swap injectors around, see if the codes follow injectors.

    Swapping in new coils and plugs does not guarantee you have spark on 6 & 8. (Might be bad coil-drivers, or bad wiring, etc...)
    Thank you very much I will post the additional codes for you once I get them and try out some of the options you have recommended


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  9. #9
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    Take the car to a shop with a BMW-specific computer that can properly read the manufacturer codes and pay them to diagnose it (reading OBD2 codes is not the same). It will be much more efficient than trying to figure it out piece by piece.





    Life's tough. It's tougher when you're stupid.
    -John Wayne

  10. #10
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    My friend O2Pilot is absolutely correct, of course. I was getting ahead of myself.....correct information and diagnosis by a BMW pro will save you a world of painful parts-throwing.

    So how's that 128i, buddy?

    Chris Powell
    Racer and Instructor since, well. decades, ok?
    Master Auto Tech, owner of German Motors of Aberdeen
    BMWCCA 274412
    German Motors is hiring ! https://www.bimmerforums.com/forum/s...1#post30831471

  11. #11
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    Thank you two I have scheduled it and is in line to get seen by the 22nd of this month. I appreciate it


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  12. #12
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    Damn, guess I need to move to California. They can't even get your car into the shop for ten days? Wow!

    Chris Powell
    Racer and Instructor since, well. decades, ok?
    Master Auto Tech, owner of German Motors of Aberdeen
    BMWCCA 274412
    German Motors is hiring ! https://www.bimmerforums.com/forum/s...1#post30831471

  13. #13
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    Quote Originally Posted by bmwdirtracer View Post
    Damn, guess I need to move to California. They can't even get your car into the shop for ten days? Wow!
    Hahaha I know what you mean school starts Monday as well:/

  14. #14
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    Quote Originally Posted by bmwdirtracer View Post
    So how's that 128i, buddy?
    Good so far. Fun car to drive, that's for sure (M-sport package, with a Bilstein/Eibach setup on top of it).

    The rear brakes needed doing, and were worn enough that a lip formed that prevented the parking brake shoes from clearing easily (even in service position), so I had to hammer the rotors off with extreme prejudice, but other than that it was straightforward. I'm going to go back in and replace the parking brake shoes and hardware when I have time; I didn't have the parts here, otherwise I would have done it all at once.

    Preemptive water pump, thermostat, belt, tensioner, and pulleys are waiting to go on when time permits. Other than that, I'm just driving it.

    Apologies to the OP for the off-topic deviation.





    Life's tough. It's tougher when you're stupid.
    -John Wayne

  15. #15
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    Quote Originally Posted by 02Pilot View Post
    Good so far. Fun car to drive, that's for sure (M-sport package, with a Bilstein/Eibach setup on top of it).

    The rear brakes needed doing, and were worn enough that a lip formed that prevented the parking brake shoes from clearing easily (even in service position), so I had to hammer the rotors off with extreme prejudice, but other than that it was straightforward. I'm going to go back in and replace the parking brake shoes and hardware when I have time; I didn't have the parts here, otherwise I would have done it all at once.

    Preemptive water pump, thermostat, belt, tensioner, and pulleys are waiting to go on when time permits. Other than that, I'm just driving it.

    Apologies to the OP for the off-topic deviation.
    It's okay you guys. It's always a good experience to see people getting along


    Sent from my iPhone using Tapatalk

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