maxos

Hi, I have been trying to figure out for a few months now why almost all my cylinders are missfiring on my w211 e500 2003. Sometimes its just the RIGHT side of the engine so cylinders 1,2,3,4

(Had a smoke test done on the car to check for engine leaks and it is leak free, ok pressure in the cylinders) Also tried swapping the coils from the left 4 cylinders to the right and the problem still remained.

Symptoms:
-It doesnt go over 4000 RPM
-Slow throttle response at times (5 -10 seconds) but not always
- in slow driving the car runs just fine with minimal missfiring
-Very slow acceleration as if the car had 50 hp
-when I give full throttle for a short period of time, then the car goes uneasy even at low speeds/revs. Even when idling, car has a lot of missfires and shakes a bit
-at full throttle, crazy amounts of missfiring


At the last service they told me to change intake manifold, but im not so sure of it.

Any tip is appreciated

CaliBenzDriver

Good job with your investigation looking out for the evidence we need.

What you describe is actually called "LIMP MODE" when the computers limit the engine to prevent worsening condition.

You fault collection shows the accelerator pedal circuit is reported faulty.
You'll want to concentrate on testing that sensor exercising the connection, inspection green crusties.
It can but is not necessarily a bard part. They are contactless state of the art sensor... not a simple golf-cart pedal.

nd-photo.nl

Jep, that would also be my advice. Inspect and focus on the pedal first