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I am awaiting for new throttle body. Will post results when it arrive.
Throttle body was recently replaced with new original Bosch. No results.
I have another idea related to possible low level changes in ME module firmware. I will come back with more details and tests results after I flash it with virgin firmware to exclude any issues on software level.
PS: ME module was recently replaced with brand new but I made a low level clone of my old module to have 2 plug-n-play interchangeable modules (switch between two at anytime without any coding).
The only thing that seems off is the left and right bank ignition angle settings intermittently jump out of specified value (video) but I have no idea how to address it.
Based on previous experience, ignition timing could be jumping around as a reaction to idle speed variation. It is very common for ignition timing to be used as a means for quick and fine idle speed control so it could be reacting, rather than causing the issue. There is probably a diagnostic mode to freeze ignition timing and you could observe idle speed.
Have you checked the 02 sensors or replaced them recently? If not maybe its time for that..
Aso has the HPFP driven off the camshaft been looked at? If the oil pressure solenoid on the front of the engine is opening and closing when it shouldnt, that affects the HPFP and could explain the intermittent timing spike and rought idling.
Try un plugging that solenoid on the bottom front of the engine and see if the intermittent issue goes away and the idle smooths out. Calibenzdriver states it can take a few drive cycles for the ecu to relearn since ithe oil pressure affects lots of systems.
Plus that is a free mod. You might take the time to read the oil solenoids unplugging thread or PM Calibenzdriver too.
Based on previous experience, ignition timing could be jumping around as a reaction to idle speed variation. It is very common for ignition timing to be used as a means for quick and fine idle speed control so it could be reacting, rather than causing the issue. There is probably a diagnostic mode to freeze ignition timing and you could observe idle speed.
Yeah was also thinking this is a reaction. As well as voltage floating during the engine float.
Ok I have played a bit with solenoids. I suppose that under solenoid you mean camshaft magnets. There are 4 of them in the front of engine.
Before disconnecting them lambda correction looks like this... As you can see you actually can see how engine is floating even without hearing it. Green and Red lines represent front O2 sensors and floating. Blue and Yellows represent rear O2 sensors and their graph is too "correctly" repeating sinusoid.
When I unplug all or ANY one of the them the floating is gone. Front O2 graph stays straight as it should be. Rear O2 become more native without a "loop".
Previously I was able to get idle speed straight when I was disconnecting different electronics. For example unplugging rear O2 sensors also return non-floating engine idle speed. So well I am wondering if this is the same case, like unplugging those solenoids put engine in a "fault" mode and that is why it start work correctly? Or the issue is in solenoids? I am a bit sceptic about replacing them cause I already replace O2 for example and didn't help... while disconnecting them made an effect. How to check these solenoids if they work properly or not?
^ Replaced all four of mine on the M273 and had no impact on the problem.
I'm switching spark plugs from Bosch to NGK (NGK PLKR 7A) per the owner's manual. Different resistor values between the two.
Will report back on whether or not this has an impact.
Lower resistance from the NGK plugs should reduce stress on the coils if nothing else.
When I listen how your engine works I do not hear any floating. It seems we have different issues probably. Could you please send a screenshot of lambda correction while engine running in idle speed, warmed up to 90+ C and you can hear the floating. Will be very interesting to combine with mine graphs. Graphs are available in ME module menu on xentry.
the ac has a variable compressor - the alternator will vary its load, and the power steering fluid is probably filthy - just rag the thing to death before the next expensive issues means u scrap it ???
When I listen how your engine works I do not hear any floating. It seems we have different issues probably. Could you please send a screenshot of lambda correction while engine running in idle speed, warmed up to 90+ C and you can hear the floating. Will be very interesting to combine with mine graphs. Graphs are available in ME module menu on xentry.
Throttle body was recently replaced with new original Bosch. No results.
I have another idea related to possible low level changes in ME module firmware. I will come back with more details and tests results after I flash it with virgin firmware to exclude any issues on software level.
PS: ME module was recently replaced with brand new but I made a low level clone of my old module to have 2 plug-n-play interchangeable modules (switch between two at anytime without any coding).
07-11-2024, 04:50 PM
. You might take the time to read the oil solenoids unplugging thread or PM Calibenzdriver too.
