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I'm looking at an E63 AMG that has a misfire. It just underwent a Renntech tune and while on the dyno, it supposedly had the timing chain skip a tooth. From what I know, the valves are undamaged but that's unknown until the engine gets completely checked. However, is this a common problem? I'm expecting the replacement would be around $3k from the dealer to replace the chain and gears.
I haven't been able to find anything about this happening either. Granted I'm well versed on the GM LS platform where it can happen but I know these timing chains are much more robust than the LS engines.
'03 E55, Range Rover Sport Supercharged, Ducati 748R
Are they sure it's a timing chain? The common misfire associated with tunes is due to spark blowout. Have you confirmed the misfire is for an entire bank of cylinders rather than 1 or two?
^ +1, unless they have direct evidence that it was timing chain skip, I would think it is plugs as its pretty common on tuned M157 cars
also a motor with a jumped timing chain will have slow/hard starting because the firing sequence is retarded due to chain that has jumped a tooth, two or more teeth probably wont start at all.... so if your car is starting fine then i doubt timing chain has jumped
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