My buddies work truck is a 6.p gmc sierra with 200k. It died yesterday, he had a chamshaft position actuator code. Wouldnt start, he tried cranking it for a while.
Got it towed to my buddies shop. Replaced the actuator which was indeed toast but still wouldnt start. The mech goes to pull cyl 1 spark plug to inspect timing and found the spark plugs were all missing their electrodes! Incredible how it was running at all. We have never seen this before.
The big question i have is, how was it not throwing spark plug and wire codes all day long? How was it even driving? Far as they could tell there were no misfire codes. Truck was reportedly running ok.
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