My 07 S6 is having a misfire that I cannot seem to figure out. I’ll cruise to the office and drive very casually and you’d never notice anything was wrong. An example of it misfiring is driving down the interstate at about 60 and then suddenly go to about half or 3/4 throttle loading the engine up. I can feel the car slightly shake from misfiring. I won’t get any CEL codes or anything.
So far I’ve replaced all the spark plugs with the OEM plugs. After that I got very radical and replaced the intake and swapped in cleaned/flow tested fuel injectors from JHM. and also did the carbon cleaning at the same time. The previous carbon cleaning was only 10k miles ago.
Before I was getting a misfire on cylinder 1 quite often so I put a new coil pack on that cylinder so far. I’ve also made sure there is no oil around the spark plugs either.
Anyone got any advice no what to do next? I’m thinking go ahead and replacing the rest of the coil packs since they are probably needing to be replaced anyway due to age. I’ve tried to do fixes that need to be done anyways.
I don’t have a vagcom reader yet to be able to scan anything.