M156 P0300 Misfires when warm
07-25-2024, 12:00 AM
#51
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S63 2008
Update (again): Removed intake manifold. Fully cleaned, inspected for cracks (none), re-assembled with 8 new Bosch injectors, 8 new NGK plugs, cleaned PCV, new intake manifold gaskets etc. Removed bank 1 valve cover and inspected the cams and checked timing. Both look perfect. Still has the exact same behavior. Idles perfect, revs perfect, goes into limp mode at 1500 RPM due to misfires on bank 1. I'm stumped at this point. Last think I can think to check/try and swap is cam position sensors/solenoids. Any other thoughts?
m156 s63 2008 misfires only on bank 1 c1,c2 when warm. After I driver her hard and come to slow driving or up the hill. And at idle it would misfire.
shut off and turn back on will not misfire.
I have changed everything. Air filter, spark plugs, coils, sensors, intake gaskets, fuel injectors. Bank 1 o2 sensor has been changed.
I'm super confusec. Need some help
Last edited by phjcvii; 07-25-2024 at 12:03 AM.
07-27-2024, 12:48 AM
#52
phjcvii
had the same issue, what my technician did:
aligned the throttle body - a process that synchronizes the throttle body's electronic components with the engine control unit (ECU) and had it cleaned prior to alignment
and he had re-programmed (trained) the vvt solenoids
worked perfect and running as should now
had the same issue, what my technician did:
aligned the throttle body - a process that synchronizes the throttle body's electronic components with the engine control unit (ECU) and had it cleaned prior to alignment
and he had re-programmed (trained) the vvt solenoids
worked perfect and running as should now
