hi
getting a random po300 random missfire code,no other codes.
i was wondering if the coils are covered under the powertrain/emissions warranty?
if not where should i start looking?
my mechanic installed 4 new ac delco plugs/air filter about a month ago,had no problems til this cropped up.
i do notice a stumble at idle before it throws the code.stays on for couple days then goes out but comes back in a week or less.
i don't think its the water in plug well as been dry as can be here.reset the gas cap also.
jeff

 

Start by checking the gap and making sure they are the right plugs.

 

Fuel injectors

 

@saturnsw2, what is the model year of your HHR?

Michelle, Chevrolet Customer Service

 

My Cobalt SS did this. The dealership cleaned my injectors, checked to see if my catalytic converter was plugged, replaced fuel filter, and replaced injector harness.

They ultimately replaced my injectors as a whole.

 

hi Michelle
2007 2.4L
canadian vehicle
would this be covered by the canadian powertrain warranty?
thanks.jeff

 

hi
my shop bought the plugs from the gm dealer so i assume they would know.
i believe they came pre-gapped(not sure)but i will ask.
they worked fine for 7000km before the code came up.
jeff