Originally Posted by dukein

After 18mos just about 12kmi, got "check engine light" ON (ouch!). Took it to SV HUMMER for diagnostics, service tech found cylinder misfire, cleared error. I have found there's 9 H3's waiting for head replacement. Next couple of days, it came back. Took it to place of purchase, confirmed misfire on cyl #2, waited two weeks for parts. Part finally came .... on surgery as we speak .