ZachHays

When I originally started driving this car it had around 58k miles on it, that was October of 2018, the car now has 72k miles on it. I had an major issue with it at 60k miles where it ran horrible and showed misfires on all 4 cylinders, I put new plugs in it and did an oil change and after a few miles of driving it fixed it, I got some bad gas and it went bull in a China shop on my fuel system and that put the car off the road for a week while I fixed it. Now I have a huge power loss at half throttle and up, a fuel trim bank 1 code, and my supercharger clutch won't engage anymore, I did test to see if it worked by hot wiring the clutch to a switch and it did, so I assume something with the engine (fuel, spark, etc) is causing my problems, I just don't have anything to go on, all the control systems on this car are space age compared to what I'm used to. (I used to dialy drive an 89 f150) I had one guy tell me that my can magnets could be the problem but I have no clue what those are or what they do . I just plugged my scan tool into the car again to see if I had any new codes, I have P0130 which is an O2 sensor fault for running too lean, P0300 Random misfire, P0304 cylinder 4 misfire, P0170 fuel trim bank 1. Those are codes I get over and over again, I have tried all my old tricks and nothing

khomer2

P0170 is related to the MAF sensor.
Check and clean your MAF first with CRC MAF cleaner. It's cheap to do.
You neglected to say this was a w202 Kompressor (ie. but you did mentioned S/C in your post...)
Check for any oil film in your air intake inline to the MAF and also inside your airbox (on the filter as well as at the bottom (low end) of the airbox.
While your at it, check your oil separator and lines to make sure they are open and clear (especially the one going to your airbox) - O/S may need to be replaced (cheap)
P0130 - you O2 sensor may have failed.

Also check your K40 relay circuit board - could be a burnt contact.

ZachHays

Already did clean it, the code is still there, I don't have any oily film on anything either. I have no clue where the k40 is, I know next to nothing about MB cars

khomer2

Did you use your scanner and delete the error code after you cleaned it?

K40 - http://www.peachparts.com/shopforum/...-one-pics.html

ZachHays

Yes, I erased all codes

khomer2

As for the S/C not engaging, I would go back and check a vacuum lines, connections (to make sure they are connected correctly), including rechecking all the plug wires are connected correctly and the coils too.
EDIT: forgot - check the CPS too. It can cause Kompressor issues

Dirgesan

Since you had bad fuel recently I would check your fuel pressure. Check it:
1. Ignition on, not running. Low pressure is either a bad pump or bad pressure regulator. Regulators rarely go bad but the bad gas could've gummed it up. The regulator also holds pressure when the car is turned off. If the pressure drops quickly when the ignition is turned off, check the regulator.
2. Running at idle and when revved. The pressure shouldn't drop much at all. If it the pressure drops a lot it's probably a dirty fuel filter or fuel line.
The bad gas and cylinder 4 is misfiring the most leads me to suspect a possible dirty fuel filter. IIRC it's at the end of the fuel rail and might not be getting enough gas.