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/

3 out of 3 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 740
#2 Zachary Pilalas
Zachary Pilalas
Reputation 460
#3 butch686
Reputation 450
View All

Related Models For Sale

Used Chrysler PT Cruiser
21 Great Deals out of 3,912 listings starting at $1,795
Used Chevrolet Equinox
1,656 Great Deals out of 69,928 listings starting at $1,970
Used Chevrolet Malibu
1,094 Great Deals out of 78,490 listings starting at $2,495
Used Chevrolet Silverado 1500
2,623 Great Deals out of 148,186 listings starting at $1,800
Used Chevrolet Impala
919 Great Deals out of 36,145 listings starting at $1,800
Used Chevrolet Cobalt
89 Great Deals out of 4,941 listings starting at $1,000
Used Ford Escape
1,646 Great Deals out of 84,908 listings starting at $995
Used Toyota Corolla
1,310 Great Deals out of 67,492 listings starting at $1,399
Used Volkswagen Beetle
256 Great Deals out of 8,593 listings starting at $1,500
Used Chrysler 300
516 Great Deals out of 20,636 listings starting at $1,500

Used Cars For Sale

2010 Chevrolet HHR SS For Sale
14 listings starting at $5,795
2009 Chevrolet HHR SS For Sale
37 listings starting at $5,995
2008 Chevrolet HHR SS For Sale
4 Great Deals out of 66 listings starting at $5,699