RAJ2012

Hello everyone.

New to this forum and hoping someone can help me out. I have a 2008 c63 and have a problem with it misfiring. It was bought with low fuel pressure code and new fuel pumps have got rid of that code.

The car has now got misfire on following cylinders:

Cylinder 1
Cylinder 3
Cylinder 6
Cylinder 7
Cylinder 8

There is no other codes at all. No fault codes for O2 sensors or any timing related codes. The CEL is flashing.

I have done compression test on all cylinders with lowest value being 180 psi and highest 200 psi.

The misfiring has increased while diagnosing from just shaking to cutting out and not even idling. Coil packs have been swapped around. New spark plugs.

hopefully someone can point something out.
Thanks

PeterA90

O2’s need to be replaced. May need new coil packs as well

RAJ2012

Thanks for your reply. I will change the O2 sensors and see what happens. I did put the car on the ramp and just disconnect the O2 sensor plugs but it didn’t make a difference to the rough running of the car.

And I did take the plugs out and just turn engine over briefly and all spark plugs were sparking, would this say the coil packs are ok?