Brimmy
04-16-2010, 18:17
HELP !!!!
2003 GMC 6.6 Duramax. My truck has been problem free until last two days.
First it started engine surging & loping as I braked for stoplights, etc. Then hesitation on accelleration until I hit 1200rpm; then seemed fine. That was yesterday.
Today; truck starts fine, starts surging before even in gear. Get to work fine. After work; starts fine, drop in gear & starts acting up again until I get over 1000rpm mark. I decide to hit friends shop on way home. He can hear my truck surging; inquires to Engine Service light; No light has come on. Scans for codes; There is nothing. I go to leave shop & truck has hard time starting. I pull out & accelerate & get very loud knocking & tons of thick white/gray smoke from exhaust. I pull into next parking lot. Engine is surging & bucking. I baby it, it hesitates till I get above the 1200 rpm mark; then will run okay as long as I don't push it. If I push it, instant knock & smoke.
What should I look for ???
2003 GMC 6.6 Duramax. My truck has been problem free until last two days.
First it started engine surging & loping as I braked for stoplights, etc. Then hesitation on accelleration until I hit 1200rpm; then seemed fine. That was yesterday.
Today; truck starts fine, starts surging before even in gear. Get to work fine. After work; starts fine, drop in gear & starts acting up again until I get over 1000rpm mark. I decide to hit friends shop on way home. He can hear my truck surging; inquires to Engine Service light; No light has come on. Scans for codes; There is nothing. I go to leave shop & truck has hard time starting. I pull out & accelerate & get very loud knocking & tons of thick white/gray smoke from exhaust. I pull into next parking lot. Engine is surging & bucking. I baby it, it hesitates till I get above the 1200 rpm mark; then will run okay as long as I don't push it. If I push it, instant knock & smoke.
What should I look for ???