08 HHr SS automatic keeps giving code for miss fire on cylinder (4) new plugs, new coil


Asked by Jan 03, 2015 at 07:02 AM about the 2008 Chevrolet HHR SS

Question type: Maintenance & Repair

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..

2 Answers


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/

4 of 4 people found this helpful.

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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