have an 03 gmc sierra 2500hd has 276000 miles on it did cylinder contribution test all cyl. came uo about the same no real diffrences but smokes at all times with no loss of power does have tuner

Asked by johngttnitdn2 Aug 03, 2015 at 03:56 PM about the 2003 GMC Sierra 2500 4 Dr SLT 4WD Extended Cab SB

Question type: Maintenance & Repair

smokes at all times but runs good no injector codes contribution all pretty typical 678 to 681

1 Answer
70,895

Kelly answered 9 years ago

start with trying this > Lucas Oil 10278 Engine Oil Stop Leak - 1 Quart

Mark helpful

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