DonCampbell
New Member
- May 23, 2024
- 3
- 2
- Truck Year
- 2016
Bought a 2016 Laramie Longhorn in 2018, eco diesel. Beautiful truck however it came with air suspension which I had to delete due to cold weather issues. At 105,000kms I did a full delete. Truck has been great until now.
Engine stumbles, at any rpm. Lift pump tested okay, CP4 pump matches target pressure, PCM change did not cure, swapped fuel metering valve on CP4 did not fix. Tested ASD relay along with others, all okay. This is a random stumble. Truck will idle for a number of minute with no issue and then stumble 2 - 3 time and clear up. Stumbles more often at 2000 - 2500 rpm. Full engine stumble like the fuel was shut off and back on as fast as possible. Injector tests on my truck and buddies truck are very similar. When my truck stumbles the injectors loose power. I have opened every wiring plug, inspected for corrosion, damage, dirt, etc. no issues or improvements. Checked push button start stop switch with no change. Disassembled the fuse box (PDC) no loose connections, corrosion, or visible cracks. Pushed and pulled each wiring connection as well as flexed wires at each bend or stress point that I could find and can not create or prevent the stumble. Cleaned MAP and MAF sensors. Opened up wiring conduits on top of the engine but don't detect any issues. Have no idea where to go next, and would appreciate any help.
Engine stumbles, at any rpm. Lift pump tested okay, CP4 pump matches target pressure, PCM change did not cure, swapped fuel metering valve on CP4 did not fix. Tested ASD relay along with others, all okay. This is a random stumble. Truck will idle for a number of minute with no issue and then stumble 2 - 3 time and clear up. Stumbles more often at 2000 - 2500 rpm. Full engine stumble like the fuel was shut off and back on as fast as possible. Injector tests on my truck and buddies truck are very similar. When my truck stumbles the injectors loose power. I have opened every wiring plug, inspected for corrosion, damage, dirt, etc. no issues or improvements. Checked push button start stop switch with no change. Disassembled the fuse box (PDC) no loose connections, corrosion, or visible cracks. Pushed and pulled each wiring connection as well as flexed wires at each bend or stress point that I could find and can not create or prevent the stumble. Cleaned MAP and MAF sensors. Opened up wiring conduits on top of the engine but don't detect any issues. Have no idea where to go next, and would appreciate any help.