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Thread: Misfire problems

  1. #1
    Join Date
    Nov 2011
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    Derby UK
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    412
    My Cars
    1999 BMW540 Supercharged

    Misfire problems

    Hi guys could someone look over these screen shots ? I got a check engine light which indicated a miss fire in cyl 1 as I have 8 spare coils from another engine it was easy to put my hand on one. I swopped it over check light cleared and everything seemed fine.
    Today I check it again with inpa and have the same codes. I cleared the codes and looked at the status of the engine in inpa and knock sensor one was giving info ok and no misfires.
    When you look at the codes though you will see engine temp @ - 48.00 and 0 supply voltage to knock sensor 1.
    Could this be a ecu fault ??

    Sent from my SM-G930F using Tapatalk
    1999 540 Auto with Eaton M112 supercharger
    BC Racing coilovers, M5 steering box, M5 LSD, Eibach/Dinan front and rear anti roll bars, PM Modifich door boards, 4 Eton 6.5s, Sound Magus VS3500.1, 2 x 10" Kove audio subs, Alpine ICS X7 Headunit, 19" BBS Hammer Sports RT245/RT246, Muffler delete, electric coolant fan.

  2. #2
    Join Date
    Oct 2017
    Location
    Beaverton, Oregon, USA
    Posts
    228
    My Cars
    2001 E39 540i Aut,180 k
    Bad knock sensor 1.
    Replace it. It is a pita to get to it -you have to remove the manifold-, so you might want to do other things "while you are there".
    Replace both knock sensors (bank-1 and bank-2 of the engine).

  3. #3
    Join Date
    Nov 2011
    Location
    Derby UK
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    412
    My Cars
    1999 BMW540 Supercharged
    Here is a screen shot of the knock sensors running in status.
    I already have a new set of knock sensors that I will be installing when I remove the blower.

    Sent from my SM-G930F using Tapatalk
    1999 540 Auto with Eaton M112 supercharger
    BC Racing coilovers, M5 steering box, M5 LSD, Eibach/Dinan front and rear anti roll bars, PM Modifich door boards, 4 Eton 6.5s, Sound Magus VS3500.1, 2 x 10" Kove audio subs, Alpine ICS X7 Headunit, 19" BBS Hammer Sports RT245/RT246, Muffler delete, electric coolant fan.

  4. #4
    Join Date
    Nov 2011
    Location
    Stupid los angeles
    Posts
    711
    My Cars
    99 540i6, 02 X5, Tundra
    I would recheck the maf wiring,
    E85 fueled, Eaton m112 supercharged 4.5L M62TU, TTV racing flywheel, Spec stage 2+ clutch, 88c thermostat, eibach sway bars, wavetrac 3.15 lsd, m5 steering box, Quantum 340lph fuel pump, Dinan camber plates, some powerflex bushings, Supersprint headers, M5 cats, 2001 gas pedal upgrade and many other things done. all diy by me

  5. #5
    Join Date
    Nov 2011
    Location
    Derby UK
    Posts
    412
    My Cars
    1999 BMW540 Supercharged
    Maf wiring has been totally replaced right back to the dme.

    Sent from my SM-G930F using Tapatalk
    1999 540 Auto with Eaton M112 supercharger
    BC Racing coilovers, M5 steering box, M5 LSD, Eibach/Dinan front and rear anti roll bars, PM Modifich door boards, 4 Eton 6.5s, Sound Magus VS3500.1, 2 x 10" Kove audio subs, Alpine ICS X7 Headunit, 19" BBS Hammer Sports RT245/RT246, Muffler delete, electric coolant fan.

  6. #6
    Join Date
    Nov 2011
    Location
    Stupid los angeles
    Posts
    711
    My Cars
    99 540i6, 02 X5, Tundra
    Can you swap the knock sensor connectors left-right?

    maybe defective maf? I'm sure you know the intake temp sensor is in the maf
    E85 fueled, Eaton m112 supercharged 4.5L M62TU, TTV racing flywheel, Spec stage 2+ clutch, 88c thermostat, eibach sway bars, wavetrac 3.15 lsd, m5 steering box, Quantum 340lph fuel pump, Dinan camber plates, some powerflex bushings, Supersprint headers, M5 cats, 2001 gas pedal upgrade and many other things done. all diy by me

  7. #7
    Join Date
    Nov 2011
    Location
    Derby UK
    Posts
    412
    My Cars
    1999 BMW540 Supercharged
    The knock sensors cannot be accessed until i remove the blower and that's a right game and new gaskets.
    I don't think you noticed, its saying engine temp is -48 not intake temps.
    1999 540 Auto with Eaton M112 supercharger
    BC Racing coilovers, M5 steering box, M5 LSD, Eibach/Dinan front and rear anti roll bars, PM Modifich door boards, 4 Eton 6.5s, Sound Magus VS3500.1, 2 x 10" Kove audio subs, Alpine ICS X7 Headunit, 19" BBS Hammer Sports RT245/RT246, Muffler delete, electric coolant fan.

  8. #8
    Join Date
    Nov 2011
    Location
    Stupid los angeles
    Posts
    711
    My Cars
    99 540i6, 02 X5, Tundra
    Quote Originally Posted by Kenny1958 View Post
    The knock sensors cannot be accessed until i remove the blower and that's a right game and new gaskets.
    I don't think you noticed, its saying engine temp is -48 not intake temps.
    The first screenshot shows intake air temp -48, missed the engine temp, maybe bad sensor there?

    I know how not fun the supercharger removal is, and $500 in gaskets, Jaguar parts are insanely expensive!
    E85 fueled, Eaton m112 supercharged 4.5L M62TU, TTV racing flywheel, Spec stage 2+ clutch, 88c thermostat, eibach sway bars, wavetrac 3.15 lsd, m5 steering box, Quantum 340lph fuel pump, Dinan camber plates, some powerflex bushings, Supersprint headers, M5 cats, 2001 gas pedal upgrade and many other things done. all diy by me

  9. #9
    Join Date
    Nov 2011
    Location
    Derby UK
    Posts
    412
    My Cars
    1999 BMW540 Supercharged
    I think there must be a short somewhere that might be intermittent and is pulling down the voltage.
    1999 540 Auto with Eaton M112 supercharger
    BC Racing coilovers, M5 steering box, M5 LSD, Eibach/Dinan front and rear anti roll bars, PM Modifich door boards, 4 Eton 6.5s, Sound Magus VS3500.1, 2 x 10" Kove audio subs, Alpine ICS X7 Headunit, 19" BBS Hammer Sports RT245/RT246, Muffler delete, electric coolant fan.

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