1997 GMC Sierra Repair Question
Topics covered: Compression, Compression test, Distributor.
Mileage: 150 miles.
Mileage: 150 miles.
Asked on November 2, 2012
GMC Sierra Compression Problem
I had a new short block put in my 97 GMC Sierra and I now have a misfire in cylinders 3 and 5. I have new plugs, wires, and complete distributor assembly. The reason for the new short block is the crank broke on the old one. Could I need new heads?
Asked by (pending member)Answer
Replied on November 2, 2012
Is it a constant missfire on those two cylinders?
Replied on November 3, 2012
Yes, it almost sounds like an exhaust leak. The oil pressure gauge bottoms out when you stop too. When the shop reassembled it they just bolted the top side back on. They didn't even look at the valvetrain. I haven't pulled the valve cover off yet and looked at it.
Replied on November 5, 2012
I would do a compression test they should have done a valve job while the heads are off.