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Originally Posted by JG  I had a similar issue with my 00 ML430 at around 55k. I used a code reader ( OBDII Diagnostic ScanTools and codereaders) with a laptop to read my misfires over the period of 4-6 months because it was indeed intermittent. I would say about 50% of the time I would get an O2 sensor code. Before I changed that, I did the scheduled changes such as spark plugs and fuel filter. After getting the more misfires again, I went ahead and changed the 02 sensor the code reader referred to. All is fine now. |
Being 68 years old I have to marvel at the automotive technology of today. My first cars were flathead Ford's. If they had a misfire we would pull one plug wire at a time to find the bad cylinder. Today we have JG spending months with a laptop to pinpoint a misfire problem, while at the same time we have i dawg 85 using a hammer to pinpoint his problem, along with as lot of common sense. Old school guys like me know when you put on a high load at open throttle and get a misfire there has to be something plugged up, especially when it clears up at low load and throttle.
Having said that, I realize the OBD's are usefull for finding bad MAF's and O2 sensors, something we didn't have on the flathead Fords. So, in spite of the new technology there are some old school techniques that are still useful!
