Heya all,
I've had some pretty bad luck with my Envoy (all the usual things have gone wrong, and then some) - this latest one is going to be the make-it-or-break it problem: I'll either fix it or just give up, drive it to the scrap yard, and be done with it.
I do all my own work (I was an apprentice mechanic 30 years ago) so at least I've saved some cash there.
OK, the latest crisis:
I had the usual OBD codes for cam actuator and sensor problems, so I swapped 'em both out. I cleared the codes, re-ran the scan and it came up clean.
I started the truck, re-scanned and a P0017 came up as pending.
I shut it off, cleared the codes, re-scanned and it came up clean (of course).
I took it for a drive, scanned and again had the P0017 pending.
I cleared the codes, let it sit overnight, started it up and the CEL is on with a hard (no longer pending) P0017 now.
My question: Is there a common cause, or something that I'm overlooking, that causes this behaviour?
I'm familiar with the list of "official" possibilities (and there are some (crank end play for example) that I don't even want to consider). I'm hoping that this happens all the time with CPS/CPAS swaps and someone is able to say "Oh, yeah, 99% of the time the "X" wire leading to the CPS harness breaks at "Y" position" or something like that.
One thing to note: Although I don't think I damaged the CPS and CPAS wiring, this behaviour (codes setting - 1st intermittent, then constant, over about 2 months) started immediately after I swapped the exhaust manifold ... Maybe there's a wire down there somewhere I disturbed?
I guess I'm asking for some brainstorming here.
Thanks in advance,
Cheers!
Gary
EDIT: Forgot the basics - 2005 Envoy SLT, about 180,000km (108,000 miles) on the truck, about 110,000km (66,000 miles) on the 4.2L I6 mill. Bought it off a corporate lease in 2007.
I've had some pretty bad luck with my Envoy (all the usual things have gone wrong, and then some) - this latest one is going to be the make-it-or-break it problem: I'll either fix it or just give up, drive it to the scrap yard, and be done with it.
I do all my own work (I was an apprentice mechanic 30 years ago) so at least I've saved some cash there.
OK, the latest crisis:
I had the usual OBD codes for cam actuator and sensor problems, so I swapped 'em both out. I cleared the codes, re-ran the scan and it came up clean.
I started the truck, re-scanned and a P0017 came up as pending.
I shut it off, cleared the codes, re-scanned and it came up clean (of course).
I took it for a drive, scanned and again had the P0017 pending.
I cleared the codes, let it sit overnight, started it up and the CEL is on with a hard (no longer pending) P0017 now.
My question: Is there a common cause, or something that I'm overlooking, that causes this behaviour?
I'm familiar with the list of "official" possibilities (and there are some (crank end play for example) that I don't even want to consider). I'm hoping that this happens all the time with CPS/CPAS swaps and someone is able to say "Oh, yeah, 99% of the time the "X" wire leading to the CPS harness breaks at "Y" position" or something like that.
One thing to note: Although I don't think I damaged the CPS and CPAS wiring, this behaviour (codes setting - 1st intermittent, then constant, over about 2 months) started immediately after I swapped the exhaust manifold ... Maybe there's a wire down there somewhere I disturbed?
I guess I'm asking for some brainstorming here.
Thanks in advance,
Cheers!
Gary
EDIT: Forgot the basics - 2005 Envoy SLT, about 180,000km (108,000 miles) on the truck, about 110,000km (66,000 miles) on the 4.2L I6 mill. Bought it off a corporate lease in 2007.