BenzWorld Junior Member
Date registered: Aug 2010
Vehicle: 2001 ML320 Sport
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2001 ML320 Error Code 306... Need help
2001 ML320 with 91K. I have had a very slight rough idle at times and been meaning to change the plugs / wires. Last Friday I was driving to work and had to accelerate to get on the freeway. Went up to 4500 rpms and the CE light came on. Read the code and it said 306 (mis fire cyl 6).
Ordered new (OEM) plug wires, plugs, and a coil pack for 6. Replaced all today and went for a drive. Same thing. Swapped new coil pack off 6 (cyl closest to drive) with 4 and same code (cyl 6 mis fire). What would cause this, it can't be a plugs, wires, or coil pack?
It only happens on hard acceleration and runs very rough until the code is cleared. Then it will run fine till hard acceleration again.
Any ideas? I am a little stumped.