I know spark plugs are a touchy subject.

I'm new to the HHR world, as I own a Cobalt SS as my other vehicle.

I tried to search on the site to no avail.

My 2006 HHR 2.4 LT is at about 112k on the odo and i think its about time for plugs per the manual. I know these engines are pretty touchy when it comes to that.

Please let me know what has worked best in YOUR 2.4 and what are the gapping specs?

Thanks,
HHR_carnatic

 

The service manual says to use a gap of 0.042 inch (1.06 mm).

Use AC Delco part number 41103, these are the Iridium plugs that the Ecotec was basically designed around. They'll give the best results based on the experience of some folks here who've tried other brands.

 

Isn't your answer somewhere in there? @112k if you're not experiencing any indications of a necessary spark plug change other than 'you think it's about time per the manual' then I'd say the OEM plugs work pretty well....