Back to work on the auction van.
I was wrong... needed 2" spacers an a little bit of grinding for fitment.
I bought this thing sight unseen ($250) just for the doors. It only has 116k on it so maybe it's worth more than that. When I picked it up I realized it had a blown up rear end, so I replaced that. Now that it can move, I determine it's got a bad misfire. Now to work on runnability.
Scantool won't communicate, I find a blown DTC fuse. No misfire codes. I fumble about with my scantool and can't determine much.
I move on to using my laptop and Forscan, and determine I have misses on both #3 and #8.
I pull the plug and coil on #8 because it is very slightly easier to access. Plug is fuel fouled, but not original. I put a fresh plug in and moved the coil to #5.
#8 misfire vanishes, #5 looks good and #3 misfire is still there because I didn't touch it yet.
I then pulled #3 and put the now dry plug from #8 in it, then move the coil to #4.
Start it up and the thing runs great. Crap. I didn't really fix anything, but the problem is gone.
Took it for a couple mile test drive, runs as good as I could have hoped for. Good power (for a 4.6), transmission, brakes, and steering do what I need them to.
I'm thinking I may have an injector issue due to the fuel fouled #8 plug, but I'm not going to chase it any further until a misfire comes back. A cold start tomorrow might point to any remaining problems. Or maybe it sat for years and had dead batteries and old fuel making some problems show up.
The battery was at 12.0v when I brought it home, it probably had a lot of starts sitting in the auction yard. That could have fuel washed some stuff and caused part of the issues. I recharged the battery before trying to start it and it fired right up (with misfires).
2008 GMC 3500 SMB
Linear Mode
