donithediver
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- Joined
- Oct 8, 2009
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Hope someone can help here. I have a 2001 ML270cdi ( Auto) that is really draining all my knowledge. Few weeks ago when driving it suddely dropped off power. It seems to be going into a safe mode and only returns to normal after engine is switched off and back on. I first thought it was air mass meter and change it but to no avail. so i replaced with old one. I then noticed the air filter was pretty dirty so changed that. still the same. I had the car looked at by a merc specialist and he spent three hours on it ....siad the air flow meter was only reading -4 and replaced it with the new one i bought earlier. still not going properly. He says now that he suspects the catalyst and says it is giving back pressure. I sometimes here a strange noise almost like a whrrr when revving but it is quite quiet. any advise would be greatful