baggednismo
New Member
- Joined
- Jan 15, 2020
- Messages
- 5
Hey All,
The problem I am having with this Avalanche is best described by every other thread detailing the crank/cam position sensor. It randomly shuts off, goes days without doing so and then once it starts it will do it all day at different intervals. Once it starts shutting off it never stays running more than 15 minutes at a time. Leave it til the next day and it will start and run fine. I can let it warm up 15+ minutes and then drive for 45min to work without incident. I can also start it after work without a warm up period and drive it home 45min without incident. I feel that if i am city driving i have a much higher chance of this happening but I have had it quite on the highway (only after it starting shutting off during city driving).
Once it shuts off I have to prime the fuel pump 5-6 times (seems to reset the sensor) and it will start. Its a rough start but it starts nevertheless. Wont stay running for long though. I replaced the fuel filter in hopes this would resolve it but that didnt help.
Could it still be a bad fuel pump? Sure, even though it sounds just like the sensor it could be the pump. definitely.
How can you be so uncertain when we have automagical electronic devices that read the codes from the ECM? Oh, well, it records absolutely no codes after it randomly shuts off... Both the dealer and a local shop say there are no codes. I brought it to both multiple times even went to a local parts store a day that it was happening and nothing.
My cheap $10 bluetooth reader and android phone however say otherwise. While I cant say I trust this thing I can get a code out of it after it shuts off but only immediately after. scan with this phone/device later and I receive no codes at all. Using Torque Pro I get P0336 and with Car Scanner I get P0011 both are crank position codes.
Assuming it were the pump and it was not electrical that could also not pop a code but I would still expect to see a cylinder misfire or something that makes sense. To have absolutely nothing for codes its really starting to peak my interest that maybe this isnt a crank sensor and fuel pump but rather an ECM issue.
I have it in the shop right now, they are replacing the crank position sensor based on my findings and research. They are not guaranteeing any work because they cannot find anything in the ECM to indicate that is the problem. The dealer wouldn't do the work at all unless they could prove that was the issue and without a code they are about as useful as a condom machine in the Vatican. Both shops dont know why its doing what its doing but I have a sneaking suspicion this might not resolve the problem.
Please advise.
The problem I am having with this Avalanche is best described by every other thread detailing the crank/cam position sensor. It randomly shuts off, goes days without doing so and then once it starts it will do it all day at different intervals. Once it starts shutting off it never stays running more than 15 minutes at a time. Leave it til the next day and it will start and run fine. I can let it warm up 15+ minutes and then drive for 45min to work without incident. I can also start it after work without a warm up period and drive it home 45min without incident. I feel that if i am city driving i have a much higher chance of this happening but I have had it quite on the highway (only after it starting shutting off during city driving).
Once it shuts off I have to prime the fuel pump 5-6 times (seems to reset the sensor) and it will start. Its a rough start but it starts nevertheless. Wont stay running for long though. I replaced the fuel filter in hopes this would resolve it but that didnt help.
Could it still be a bad fuel pump? Sure, even though it sounds just like the sensor it could be the pump. definitely.
How can you be so uncertain when we have automagical electronic devices that read the codes from the ECM? Oh, well, it records absolutely no codes after it randomly shuts off... Both the dealer and a local shop say there are no codes. I brought it to both multiple times even went to a local parts store a day that it was happening and nothing.
My cheap $10 bluetooth reader and android phone however say otherwise. While I cant say I trust this thing I can get a code out of it after it shuts off but only immediately after. scan with this phone/device later and I receive no codes at all. Using Torque Pro I get P0336 and with Car Scanner I get P0011 both are crank position codes.
Assuming it were the pump and it was not electrical that could also not pop a code but I would still expect to see a cylinder misfire or something that makes sense. To have absolutely nothing for codes its really starting to peak my interest that maybe this isnt a crank sensor and fuel pump but rather an ECM issue.
I have it in the shop right now, they are replacing the crank position sensor based on my findings and research. They are not guaranteeing any work because they cannot find anything in the ECM to indicate that is the problem. The dealer wouldn't do the work at all unless they could prove that was the issue and without a code they are about as useful as a condom machine in the Vatican. Both shops dont know why its doing what its doing but I have a sneaking suspicion this might not resolve the problem.
Please advise.