08 HHr SS automatic keeps giving code for miss fire on cylinder (4) new plugs, new coil
This car keeps giving code for misfires on cylinder #4. Things done are replaced coil and
plugs, swapped coil and plugs around cleared codes and in about 150 miles or so codes
back again car has no real noticeable lack of power either. Also have used chrvron
injector cleaner in a couple of fill ups..
There is a TSB associated with your misfire issue. Take the car to the dealership. It is caused by carbon buildup in the intake. Here is a link, see post #6......http://www.chevyhhr.net/forums/problems-service-repairs- 42/misfire-code-p0304-49126/
If that a coil on boot on plug set up did you check the boot for carbon tracking? It will be a light gray looking spot on the boot. Normally right around where it snaps on to the plug. Swap boots around and see if miss fire follows the boot.
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