Mark Duke

I've been out of town working most of the year. This issue has been resolved, but I'm not sure how. I'm going to start a new thread with where I'm at now.

I have one of those heat sensing guns on the way. Hopefully it will either confirm or rule out a dead cylinder. Thank you for your info.

It does go away, but more like 2,000 to 2,500 RPM. I was thinking the timing might be causing the misfire. Could the misfire be causing the retarded timing at idle? What data do you recommend I look for with the scan tool?

Thank you for the info. I knew a negative timing didn't sound right. Now to figure out what the issue is.

I have a few issues I'm diagnosing on this truck I traded for - 2014 4.3L. The previous owner said he changed the Camshaft Position Sensor for a P0341 code. That didn't fix it. I pulled the wiring diagram and checked the wires back to the ECM. One of them had high resistance so I changed the jumper harness and the wiring checks good now. I still have the P0341. I noticed something today I didn't notice before. The ignition timing is currently running -8 to -13 degrees at idle. That doesn't sound right at all. I have AllData DIY and can't find any info on what the timing should be. My initial thought is there is an issue with the VVT system. There are exceptions, but I am not a "throw parts at it and hope it fixes it" kinda guy. I want to be reasonably sure what I'm doing before I do it. The truck has a dead miss w/ no codes or misfires noted on scan tool. I feel like I need to solve the timing issue before worrying about anything else. Do you guys have any recommendations on what to check? Is there a procedure for checking the timing? Any guidance would be helpful. Thank you.