Quantcast

Car Repair Help Forums

Ask our auto mechanics for help to all your car questions now.




All times are UTC - 6 hours [ DST ]




Ask A Question Reply   
Author Message
 
Have 2007 HHR with Random misfire code, but if hooked to scanner while car running the misfire is racking up in cylinder#2 Spark plugs have been replaced and coils be replaced injecters have been switched.What could be wrong?


   
 

Share On:

Share on Facebook FacebookShare on Twitter TwitterShare on Digg DiggShare on MySpace MySpaceShare on Delicious DeliciousShare on Google+ Google+

 
User avatar

contributions: 310
Images: 4
First be sure to check for a vacuum leak.

But, this sounds like a compression problem.
The 4 cyl has problems with carbon getting on the valves.
The carbon will hold valve (s) slightly open. Usually only effects at idle. Some times it is severe enough to cause damage to the valve seat.
Do a compression check on all cylinders. You may find #2 lower than the others. This would indicate the carbon problem.
You can try to have a de-carbon service done. This has about a 50% chance of helping. Do a de-carbon service and then drive it on the highway and "Blow it out" a few times.
If this does not work, removal of the head would be next. Theses heads are not repairable, so if damage to the seats, the head would have to be replaced.
If this is the case, removal of the cylinder head would be covered under the GM 5 year, 100k miles powertrain warranty.
_______________

Be sure to check the Similar questions down this page for more help.


   
 
Ask A Question Reply   


   Similar Topics   Author   Replies   Views   Most Recent 
New Articles View the first 2003 gmc envoy random misfire

in GMC Trucks

hooverrwh

2

492

Sun Oct 27, 2013 8:37 pm

hooverrwh View the latest

New Articles View the first 2003 Trailblazer random stalling at idle while braking/park

in Chevy Trailblazer

Patriot55

2

184

Fri Nov 22, 2013 5:03 pm

Patriot55 View the latest

New Articles View the first 03 Trailblazer rough idle

in Chevy Trailblazer

chevygal21481

1

179

Mon May 05, 2014 11:21 pm

carriedi View the latest

New Articles View the first 2007 envoy #4 misfire code

in GMC Trucks

miken856

6

599

Mon Nov 11, 2013 5:25 am

erum View the latest


All times are UTC - 6 hours [ DST ]



Search for:
Jump to: