Mattyb1984
Member
- Joined
- Oct 25, 2020
- Messages
- 19
- Reaction score
- 21
- Your Mercedes
- C220CDI
Hi Guys,
Hopefully somebody may be able to help me here as i have a Mercedes c220cdi 2012 that i have just rebuilt the engine due to bottom end failure. The car had been sat for 18months and so i expected a few issues with sensors etc... but im at a loss with this now. When i rebuilt the engine, it had the crank reground, oversize shells, new piston rings, bores deglazed, head gasket etc.... it was a complete teardown.
The car starts first turn of the key, however has a running fault that i cannot get to the bottom of. Cylinder 3 will not run. Compression is good across all 4 cylinders but im continuously getting p0269 fault code. All injectors have been coded in but cannot perform the zero configuration due to this error. The car shakes badly as it is only running on 3 cylinders. I have checked continuity on the wiring from the injector back to pins 1/73 on the ecu and they are fine. I have performed a leak off test on the injectors and they are all fine. No matter what i do i cannot get it to fire on cylinder 3. If i move an injector from cylinder 2 to 3 or vice versa it doesnt make any difference. I have rebuilt loads of engines and never had issues like this before. This is the first mercedes i have rebuilt though. Im convinced its an injector but normally if you interchange between cylinders the fault follows the problem injector but not in this case. Its as though the ecu is shutting down the injector right from the start.
But wait theres more.......
I purchased a 2011 c200 cdi om651 3 weeks ago which had been diagnosed as a blown engine. It was £1400 with 105k so i thought i would take a chance. I put a battery on it and it fired up, sounded dredful and then died. I can understand the garage saying the engine had blown as it had the worst deisel knock ive ever heard. Long story short, turns out as it had only done 5k each year for the last 4 years the dpf was blocked solid, the injector tips had balooned and was dumping diesel like mad into the chamber. So i cleaned the dpf (which is easy on these, why cant all dpfs split like these) replaced the injectors with a 2nd hand set, guess what you guessed it exactly the same fault as the above car. So i have 2 cars with identical problems, both have good compression, both seem to be shutting down cylinder 3. Both have fault code p0269 which is a balance/contribution fault.
When checking the smooth cylinder balance on Xentry i get:
cylinder 1 10
cylinder 2 9
cylinder 3 -100
cylinder 4 8
doesnt matter which injector i put in which cylinder i get the same readings ie. cylinder 3 is always -60 or above. The actual figures above are not exact just an example.
No other fault code on the cars and as much as im convinced its an injector issue i cannot understand why its always cylinder 3 thats at fault as surely the faulty injector would then be in a different chamber so that cylinder should then show the fault. I dont want to spend ££££s on 2 new sets of injectors if thats not the fault so im hoping somebody with knowledge on these engines can help me.
Thanks in advance
Hopefully somebody may be able to help me here as i have a Mercedes c220cdi 2012 that i have just rebuilt the engine due to bottom end failure. The car had been sat for 18months and so i expected a few issues with sensors etc... but im at a loss with this now. When i rebuilt the engine, it had the crank reground, oversize shells, new piston rings, bores deglazed, head gasket etc.... it was a complete teardown.
The car starts first turn of the key, however has a running fault that i cannot get to the bottom of. Cylinder 3 will not run. Compression is good across all 4 cylinders but im continuously getting p0269 fault code. All injectors have been coded in but cannot perform the zero configuration due to this error. The car shakes badly as it is only running on 3 cylinders. I have checked continuity on the wiring from the injector back to pins 1/73 on the ecu and they are fine. I have performed a leak off test on the injectors and they are all fine. No matter what i do i cannot get it to fire on cylinder 3. If i move an injector from cylinder 2 to 3 or vice versa it doesnt make any difference. I have rebuilt loads of engines and never had issues like this before. This is the first mercedes i have rebuilt though. Im convinced its an injector but normally if you interchange between cylinders the fault follows the problem injector but not in this case. Its as though the ecu is shutting down the injector right from the start.
But wait theres more.......
I purchased a 2011 c200 cdi om651 3 weeks ago which had been diagnosed as a blown engine. It was £1400 with 105k so i thought i would take a chance. I put a battery on it and it fired up, sounded dredful and then died. I can understand the garage saying the engine had blown as it had the worst deisel knock ive ever heard. Long story short, turns out as it had only done 5k each year for the last 4 years the dpf was blocked solid, the injector tips had balooned and was dumping diesel like mad into the chamber. So i cleaned the dpf (which is easy on these, why cant all dpfs split like these) replaced the injectors with a 2nd hand set, guess what you guessed it exactly the same fault as the above car. So i have 2 cars with identical problems, both have good compression, both seem to be shutting down cylinder 3. Both have fault code p0269 which is a balance/contribution fault.
When checking the smooth cylinder balance on Xentry i get:
cylinder 1 10
cylinder 2 9
cylinder 3 -100
cylinder 4 8
doesnt matter which injector i put in which cylinder i get the same readings ie. cylinder 3 is always -60 or above. The actual figures above are not exact just an example.
No other fault code on the cars and as much as im convinced its an injector issue i cannot understand why its always cylinder 3 thats at fault as surely the faulty injector would then be in a different chamber so that cylinder should then show the fault. I dont want to spend ££££s on 2 new sets of injectors if thats not the fault so im hoping somebody with knowledge on these engines can help me.
Thanks in advance
