Since we had an ice storm here I have not done any work recently, except for a cam sensor on my girl's 2002 TrailBlazer 4.2. She had a sudden die at idle, in gear, at a stop light about 300 miles north. Started right back up but never saw a CEL. That was about 4 months ago. I looked at all grounds, fuel pressure and also checked for pressure loss, checked history codes and basically came up with nothing. Has been fine till about a week ago when the CEL came on and stayed on. Had a P0340 cam sensor related code. Ran great and no running problems or restart problems. Cleared code and has not come back. I ordered in a Genuine GM sensor and took extra time getting here because of ice storm.
Ok, so I replaced the cam sensor yesterday. Finally got the AC Delco/Genuine GM part in at AZ. It literally took all of 5 minutes to replace. I did find something interesting though. The attaching/hold down 10mm bolt was loose and backed out a bit and when I found that, I pushed on the cam sensor and it moved closer to head and bottomed out. There was no oil leak because the o-ring was still sealing in the hole/cylinder. So, it must have been floating at times. I wonder if the closeness to cam variance was enough to cause a CEL and the one time dying at idle at a stoplight? Here are the pics:
View attachment 419426View attachment 419427View attachment 419428View attachment 419429