paulzale

Still having cold start issue where I believe car is flooding, remove fuel pump fuse and it fires right up. I have replaced the following:

1. MAF
2. Fuel Filter
3. EGR Valve
4. Fuel Injectors
5. Cleaned throttle body with Seafoam
6. Temp Sensor

At a loss, I have a cheap OBDII reader, no codes, no CEL, all seems good. Thoughts?

tkid

Double check all your sensors!.. I once had a car that had this exact issue, it turned out to be corrosion on the terminals of the coolant temp sensor.. causing a high resistance value, interpreted by the ECU as a -20'C temp below zero! Causing the engine to flood!, the only way i could get it to run was by turning off the fuel pump..

paulzale

OK, I have an OBDII reader that does live data, I don't see any issues with temperatures the sensors read. I do see the TPS reading is about 8% with ignition on, then will drop to 3-4% while idling after I get it to start.

D.landa

any updates on your issue? Have a car doing exact same and it’s driving me nuts that cant figure it out

paulzale

No update, still haven't found issue, it's cold again so I'll be pulling the fuse to start. Here's another thread of same issue, but really nothing new.

https://mbworld.org/forums/c-class-w...when-cold.html

D.landa

this guy supposibly found the fix https://www.benzworld.org/threads/ca...-cold.1823802/

paulzale

Thanks, seems I've done everything except have the computer reprogrammed. Which computer and how to convince my dealership to just do it are a different story. I'm fairly certain it's a computer issue though based on several years of researching, replacing parts and living with the issue. Just really an inconvenience to remove fuel pump fuse when it's cold until it starts.