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rpmdiag
rpmdiag, Tech and Instructor
Category: Mercedes
Satisfied Customers: 7506
Experience:  Since 1975
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2000 ml 320 with a code p0300 multi cylinder miss fire.

Customer Question

2000 ml 320 with a code p0300 multi cylinder miss fire. Check fuel pressure 50.
Submitted: 8 months ago.
Category: Mercedes
Expert:  rpmdiag replied 8 months ago.

Hi, I'm Ron and I will be helping you today.
Stand by for a moment while I prepare your answer.

Customer: replied 8 months ago.
Ok
Expert:  rpmdiag replied 8 months ago.

Okay, more things to check would be plugs, wires, coils and CRANK sensor. That's for the ignition part of it.

Fuel injectors, fuel injector power covers the fuel part of it.

Vacuum leaks inside and out of the engine.

You would need a smoke machine to attach to the intake for internal leaks such as intake gaskets etc..

Check MODE 6 on the scan tool for more direct misfire information.

Check the freeze frame data for what criteria was met when the code set.

Thanks, Ron

Expert:  rpmdiag replied 8 months ago.

Your fuel pressure is also 4 PSI lower than specs call for, so the pump is bad and may fix this code .

Thanks again and please remember to rate me 5 stars and keep this link in case you need ma again later on.

Ron

Expert:  rpmdiag replied 8 months ago.

Hi, I'm just following up with you to see if you have any more questions.
Thanks, Ron