ML500 Losing Power

[thewhirls]

Hi All,
My names Robert and have owned my ML for around 5 months. In all this time its never missed a beat but recently has been dropping down to 7/6 cylinders, its becoming more regular now. I've replaced the Air Flow Meter, had it Serviced and the problem only gets worse. I really like this car and dont want to sell it so has anyone got any ideas on a fix?
Thanks in advance.

 

[A210AMG]

Hello


Welcome also from another ML owner, Mine only ever runs on 6 cylinders and seems fine

Seriously though have you had it plugged in to a Star machine to have any fault codes read?

I'm not technical so hopefully someone will be here soon to help.

 

[wobbly]

I had a problem with my previous ml, misfiring.
One of the coil packs had broken down, easy replaced once diagnosed.

 

[thewhirls]

Hi,
Yes i've had the codes read, but they all related to the airflow meter, which of course have all cleared now, i'm really stumped with this one, i can usually find someone to fix my cars!!

 

[thewhirls]

Hi Wobbly,
We,ve tried swappind coil packs as well, but it still happens, we,ve also pressure tested the relevant bits as well

 

[A210AMG]

Hello

Was the replacement part a genuine Merc one rather than a e-bay special? also is there an independant garage near you or did you take it to Merc to have the codes read?

 

[thewhirls]

I've tried the Ebay special and then a brand new genuine Bosch one which was fitted this morning. I took the car to a local garage i use, really because i've been using him for years, he looks after the LPG system for me ( which does exactly the same as the petrol )

 

[thewhirls]

I'll post some pics of my car at the end of the week, i've got some AMG arches to fit soon as well, its gorgeous!!! Unfortunately the car was a Fiance Reposession so i dont know much about the history of it though

 

[thewhirls]

I meant Finance!!

 

[lynall]

I changed the plug leads on mine due to a misfire at tickover 3 of the 16 had much higher resistance than the old ones, new leads cured the prob.



Lynall

 

[EDZ649]

I had the same problem on my E55, lumpy idle which gradually got worse, diagnosed as a degenerating plug lead. Just changed that lead and problem sorted. Also had the same problem on an E240 previously.