Charles Hughes
TYF Newbie
- Joined
- Jul 23, 2020
- Posts
- 29
- Reaction score
- 20
2007 GMC Yukon Denali 6.2
So I attempted to install a new oil pump but was interrupted half way and had to stop. I removed the water pump. I removed the power steering pump rack assembly (5 bolts) and pushed it off to the side. I used a factory gm puller and tried with that along with O'Reillys puller and when I had to stop I just reassembled and figured I would do it next week.
I don't know what happened in the short time I removed those few items but now when I start I get P0641. I did use a small map gas torch on the crank bolt. No wiring seems to be bad. There is the one plug behind the bolt and that 6pin one or whatever it is on the bottom of it. I checked the wire harness's including the harness that usually rubs and causes it over the coil packs. Anyone have any ideas while im on a break or have any clue what might have been messed up? I checked the plug for the maf as well as the map sensor. It will try to start. Sometimes backfires but that's about it, throttle plate on the throttle body will twitch but not move alot but assuming that is caused by the bigger problem. If I try to crank it I do have fuel at the fuel rail if I press the fuel valve so assuming I have a working fuel pump although fuel level recently has been reading incorrectly sometimes. Open to ideas
So I attempted to install a new oil pump but was interrupted half way and had to stop. I removed the water pump. I removed the power steering pump rack assembly (5 bolts) and pushed it off to the side. I used a factory gm puller and tried with that along with O'Reillys puller and when I had to stop I just reassembled and figured I would do it next week.
I don't know what happened in the short time I removed those few items but now when I start I get P0641. I did use a small map gas torch on the crank bolt. No wiring seems to be bad. There is the one plug behind the bolt and that 6pin one or whatever it is on the bottom of it. I checked the wire harness's including the harness that usually rubs and causes it over the coil packs. Anyone have any ideas while im on a break or have any clue what might have been messed up? I checked the plug for the maf as well as the map sensor. It will try to start. Sometimes backfires but that's about it, throttle plate on the throttle body will twitch but not move alot but assuming that is caused by the bigger problem. If I try to crank it I do have fuel at the fuel rail if I press the fuel valve so assuming I have a working fuel pump although fuel level recently has been reading incorrectly sometimes. Open to ideas
Last edited:
