This is my first Mercedes I bought used in Jan 2008 a 2002 ML320 with 56,000 miles it was a great deal and looked almost new.
Now My ML320 has 72,000 miles recently starting having a problem during acceleration like on the freeway or uphill. When I press the gas to downshift the CEL would come on and the engine would run rough until I turned it off then runs fine. After several starts/stop CEL is off and it continues to run fine, until next time I try to accelerate fast.
I took the car to an independent mechanic and at first they said replace all the plugs and wires plus they saw a misfire on cylinder 6 replaced the #6 coil as well. OK, problem still there, upgraded/recalibrated the ECU, problem still there.
The mechanic now say that there is a floating valve on #6 at around 5000 rpm
that is causing the misfire and the ECU is turning off the #6 injector and turning on the CEL. He states that as long as I drive less aggressively it should be fine and the bad valve won't be a problem.
I respect this mechanic and I think he honestly believes what he is telling me.
However, my gut feeling is that this is a different problem, possibly MAF which he said there is no code for this in the log and if it was the MAF it would misfire on more than one cylinder. He says this is only misfiring on #6 no other. Unfortunately I don't have the codes.
I really like this car however if it is going to be a continuing problem, then it is back to the Japanese cars for me, where I have had better experience.
Any ideas or opinions are welcome and appreciated.
Now My ML320 has 72,000 miles recently starting having a problem during acceleration like on the freeway or uphill. When I press the gas to downshift the CEL would come on and the engine would run rough until I turned it off then runs fine. After several starts/stop CEL is off and it continues to run fine, until next time I try to accelerate fast.
I took the car to an independent mechanic and at first they said replace all the plugs and wires plus they saw a misfire on cylinder 6 replaced the #6 coil as well. OK, problem still there, upgraded/recalibrated the ECU, problem still there.
The mechanic now say that there is a floating valve on #6 at around 5000 rpm
that is causing the misfire and the ECU is turning off the #6 injector and turning on the CEL. He states that as long as I drive less aggressively it should be fine and the bad valve won't be a problem.
I respect this mechanic and I think he honestly believes what he is telling me.
However, my gut feeling is that this is a different problem, possibly MAF which he said there is no code for this in the log and if it was the MAF it would misfire on more than one cylinder. He says this is only misfiring on #6 no other. Unfortunately I don't have the codes.
I really like this car however if it is going to be a continuing problem, then it is back to the Japanese cars for me, where I have had better experience.
Any ideas or opinions are welcome and appreciated.