smurtaza

My 03 C32 with 104K miles is refusing to start. It cranks and trys to fire up but does not start. Had the same issue a couple of weeks ago but started after sitting for a while. It started but was missing badly and CEL came back with misfire on multiple cylinders. Ended up replacing the plug wires (had replaced spark plugs not wires a few weeks before) and all was good, ran smooth and started with no issues.

Now after 2 weeks I have the same problem again but no codes are stored. I just checked fuel pressure and came back with around 55 PSI while cranking, so I don't think it's a fuel starvation issue. I have ordered a new CPS and will be replacing it but am not sure if that will solve the issue. I think CPS usually fails when hot and engine does not fire at all. My issue is when the car is cold and it does try to fire up just does not stay started.

Don't know what else to look for and need help on troubleshooting. Any advise is greatly appricaited.

Supgee

Check fuse number 48 for the motor electronics under the hood.
I had this fuse blow on my C32 and the engine would crank but would never start because the fuse was blown.


Check to see if this fuse is in tact!! It will cause a no start condition similar to what you are experiencing

C3Duece

Did you buy OEM? I've read some of the cheap Chinese parts can make things worse.


and good advise from supgee about checking fuses.

insame1

Just thorwing this out there but, have you unpluged the MAF and seen if there is any change?

Lenin

C32 does not have a MAF.

Supgee

Correct. The c32 amg does not have a mass air flow sensor, it uses a manifold absolute pressure sensor.

insame1

good to know.