BenzWorld Junior Member
Date registered: Dec 2007
Vehicle: 2001 Mercedes Benz CLK430 AMG
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I've had this same problem all summer long...to make a long story short:
2001 77k miles
Last year installed the Kleemann headers with 200 cell sportcats and new plugs.
No issues until this summer, about 1 year/10k miles since install of headers I started to notice the car would bog down while coming to a complete stop. This only happened intermittently and after the 5th time i started to get the C.E.L.
Codes were for P300-P306 (random misfire/misfire on cylinders 5-7) and also a P150 code (Bank 2 Sensor 1 02 circuit).
I replaced the fuel filter and everything was O.K. for a week.
I then swapped the coil packs from Bank 2 to Bank 1, still having the issue.
I bought new 02 sensors and BANG! fixed the problem. This was great for about three weeks, outstanding fuel mileage and great power---but then the cats started to fail...
I knew that these would not last as I used a set of shitty cats that were left on the shelf so we replaced them with a better set..I figured this was it for the summer, no more issues but it's been two weeks now and the car is still not right.
With the new cats, new fuel filter, new 02 sensors, the car still hesitates, feels underpowered, and is nowhere near the fuel mileage I once used to get.
This weekend I pulled the MAF and cleaned with CRC, I noticed the inlet pipe to the throttle body was loose so i reclipped and put everything back together...NO LUCK. The car is still "Not Right". ( I mean "Not Right" because this car used to pull like a monster, get great gas mileage with no issues.