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 out of 4 people think this is 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.

Your Answer

Add photo

Related Questions

Search Chevrolet HHR Questions

Chevrolet HHR Experts

#1 Tom Demyan
Tom Demyan
Reputation 880
#2 Zachary Pilalas
Zachary Pilalas
Reputation 480
#2 Js08016
Reputation 480
View All

Related Models For Sale

Used Chrysler PT Cruiser
12 Great Deals out of 3,121 listings starting at $995
Used Chevrolet Malibu
917 Great Deals out of 79,610 listings starting at $1,500
Used Chevrolet Equinox
1,079 Great Deals out of 71,024 listings starting at $1,800
Used Chevrolet Impala
585 Great Deals out of 31,590 listings starting at $799
Used Ford Escape
1,417 Great Deals out of 93,956 listings starting at $900
Used Chevrolet Silverado 1500
1,686 Great Deals out of 174,621 listings starting at $1,250
Used Chevrolet Cobalt
52 Great Deals out of 3,871 listings starting at $1,799
Used Dodge Charger
405 Great Deals out of 28,088 listings starting at $1,988
Used Chevrolet Tahoe
557 Great Deals out of 28,837 listings starting at $1,699
Used Chevrolet TrailBlazer
89 Great Deals out of 4,600 listings starting at $1,150

Used Cars For Sale

2010 Chevrolet HHR SS For Sale
4 Great Deals out of 18 listings starting at $6,487
2009 Chevrolet HHR SS For Sale
28 listings starting at $5,999
2008 Chevrolet HHR SS For Sale
37 listings starting at $5,295

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.