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Re: 97 C1500 w/codes PO339 and 341
P0339 is for the crank sensor (CKP) Sensor Circuit Intermittent.. P0341 is for the cam sensor (CMP) Sensor Performance.
After reading thru the diagnostics for both of these codes I would suspect something with the CKP since you were in there changing the timing chain.
1. Chipped or damaged reluctor wheel
2. Incorrect reluctor wheel
3. Incorrect alignment of the CKP to the reluctor wheel
Also if the CKP was removed and/or replaced the CKP System Variation Learn Procedure needs to be performed. This requires a high end scan tool in the hands of a knowledgeable technician.
Let us know how it goes.
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