cemass86

Hi, i have e200 1.8 cgi engine shaking....
P030300 misfire in cylinder nr 3. I have checked coil is ok and spark plug is ok, but still the same misfire on cylinder nr 3! Any ideas? think about injector. The car have 100000km

konigstiger

https://www.autocodes.com/p0303_mercedes-benz.html

Mud

As K showed, resolve the setting criteria for the code. You need compression , fuel and spark in the right amounts and timing for successful firing.
When a cel sets it also captures freeze frame data - look at that for anomalies.
You said spark is ok - don't take this badly but how did you check and verify?
A good scantool can show run data as well as injector pulse width. If you or the shop has an oscilloscope, a relative compression test is quick and easy.
You have to work through the 3 factors needed for complete combustion.

Sunnyslope48

Was the misfire discovered because the engine was running or idling poorly, or just because of a check engine light?