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Light tap on a gas pedal creates hight RPMs and slow return to idle gear lever in N p
Very strange engine behaviour. Even a light tap creates this high rpms and slow return to idle also there is a less power until 2000rpms. I installed new gas pedal and new MAF sensor without any change, also i have fixed all vacuum air leaks. No check engine light. Here is the video with the issue
https://youtu.be/7dKPIf3lqOg?si=qij3CT67jedTb_eh
Last edited by ANEV; Nov 25, 2024 at 12:11 PM.
Reason: Aditional info
u r going to need proper diagnostics - on this model you almost can't open the door without dealer tools plugged in to keep the software behaving - expecting to fix weird engine management stuff with guess work is unlikely to be a fun or speedy experience
as a quick fix - one could try and reset the throttle damper - a silly pedal calibration using dealer tools (of course check out the many faults of doom after wiping the crap and then driving for a few mins to see what's actually real
if you are going to run an S class from more than 10 mins join this
No no, totally not normal. I am just stepping and release very fast a pedal and rpms are still rising and veery slow going back to idle. Its just like there is a vacuum leak and someone is spraying carbon cleaner right there on a leak. Also the car is sluggish until 2000rpms when in drive and when climbing a little bit noisy, sounds like BUUU! Smoked everywhere with smoke machine even thru two "EGR" valves and smoke is coming out from the exhaust freely. There is a slight vibration at idle. Engine and ATF mounts changed months ago(lemforders). New spark plugs and injectors cleaned and tested with stand, one was not so good and i change it.
Not even one...i am waiting for my xentry diag and will try all the adaptations and magic tricks too see if helps. Not sure if there is some codes which my cheap diag is simply not detecting/reading. Soon 😀
That is correct, the standard OBDII system will not read the more complex, proprietary Mercedes codes, sadly. I have a gut feeling you have a TPS-APS sensor communication issue.
Throttle Damper... reset calibration - its in the Engine ECU section
I now believe this should be done whenever the Rear SAM is flashed - it seems to affect throttle usage of cruise on cars with radar cruise (distronic plus)
I'd clear the guff about camshafts and see if it comes back - (quite normal, often its the sensors are playing up) clear and see what happens
But the coolant temp needs sorting - doubt its off the stat connector.... find another engine temp sensor and replace it ? - and or double check the software part number for the engine ECU SW - they did an update it should have had from years back
don't forget its a Merc they fit extras in software to achieve unknown goals - some later models they discovered special trick with ambient temps making them throw engine lights - and the early map also had tighter tolerances to throw camshaft position errors
Might be air intake sensor as thats showing silly....
in your pictures at the top middle - it shows how to turn on and off the ignition key with a tick box - that how you play when in the learning version of the toy
open Xentry not Xentry simulation and you have a chance to diagnose the car not play games
I was messing with coils testing them with some spraying water on them in the dark to see if there is spark fault. Finding nothing wrong, but i decided to continue the search... ending to mess with the PCV valve and when i shut it some strange noises appears. This whinning/whistle noise is there always but after i shut the PCV breather with finger the noise is getting stronger
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