2002 GMC Sonoma 4.3 V-6 Codes
Posted: Thu Jan 31, 2019 11:11 am
I am looking for some insight into a 2002 GMC Sonoma 4X4 with a 4.3 V-6
Truck came in with a crank no start condition. P0341 and P1637 were the only codes present. I examined the camshaft sensor and found that the distributor as well as the sensor were damaged (cracked) replaced with a new distributor assembly and reassembled the parts. Still a crank no start. Checked for codes again, none present. Checked fuel pressure found it to be 48 psi, installed return line shut off valve and rechecked fuel pressure, still 48 psi. Replaced fuel pump and rechecked fuel pressure, pressure now at 60 psi.
Still a crank no start with no codes.
Tried alternative fuel, carb cleaner, still no start. Disconnected exhaust at manifold, still no start. Removed valve cover and checked number one rocker arms at TDC and both valves closed. Attached timing light to number one and checked ignition pulse, dead on TDC.
Everything points to injector assembly except the failure to fire with alternative fuel supply. I am really scratching my head here....
Got any ideas that I haven't tried?
Truck came in with a crank no start condition. P0341 and P1637 were the only codes present. I examined the camshaft sensor and found that the distributor as well as the sensor were damaged (cracked) replaced with a new distributor assembly and reassembled the parts. Still a crank no start. Checked for codes again, none present. Checked fuel pressure found it to be 48 psi, installed return line shut off valve and rechecked fuel pressure, still 48 psi. Replaced fuel pump and rechecked fuel pressure, pressure now at 60 psi.
Still a crank no start with no codes.
Tried alternative fuel, carb cleaner, still no start. Disconnected exhaust at manifold, still no start. Removed valve cover and checked number one rocker arms at TDC and both valves closed. Attached timing light to number one and checked ignition pulse, dead on TDC.
Everything points to injector assembly except the failure to fire with alternative fuel supply. I am really scratching my head here....
Got any ideas that I haven't tried?