Mercedes benz ml 63 check engine

Question

Hello , my name is Robert and I have a Mercedes benz ML63 amg , the check engine light is on and the scanner say is the p0191 error. So I decide to go to the Mercedes benz auto shop and  I change all the fuel system of my car : fuel bump system and the fuel rail sensor pressure , and the check engine light still on.
The car works perfectly and the scanner say the same problem ( P0191).
I hope you can help me.
Thank you so much
Robert Pardo

Answer 1

Has this ECM been updated with the Recall that is required, What happens is the ECM does not report the correct DTC. among that is does not clear correctly, there are various issue if the ECM does not have the update software. Use TSB # 20080700001A. If the update software is installed. you need a scantool to communicate with the ECM to compare actual fuel pressure with the actual fuel value, If its good you check power supply to the fuel rail pressure sensor

Answer 2

Hello

I have a problem with my ml63 AMG from 2007 with 166.000km.

When i start THE car i drive 15km (20minutes ) with full 510pk power. And than goes THE car slowly No power.
And makes a weird choking sound doesn't above the 3000 touring.
Car parking for 1 to 2 hours allow, and the car ride good again by but after 15/20 minutes again the same problem

Replaced

New fuelpump

New fuelfilter

New injectors 

New ECU 

New fuelrail pressure sensor

The problem is the same

Help me please

 

Comments

If there is vacuum gauge you can use that and check for exhaust back pressure, , I understand that if there is exhaust back pressure there would also be a cooling map code that would set, rule out exhaust back pressure