While letting my H3 idle, it seems to run "rough". I also notice that my engine light was on. So I called OnStar to have them run a diagnostic test on my H3. They told me that there was an emission problem caused by a emission misfire??? Has anyone else experienced this problem, and if so, how can it be repaired?? Any information on this problem would be appreciated.


Thanks,
LS

 

See the head/valve threads at the top of this category. Check your VIN # against it and go from there. Sounds like the dreaded head problem.