92 GMC truck

[lugnut178]

I have a 92 gmc truck with a 6.5 diesel. It has a bad skip. I loosened the injector lines one at a time. Lines 1,3,5,7,8 made the rpm's drop about the same.

Line 2 made the rpm's drop probably twice as much as the others. I could not access lines 4 & 6 because they are under the turbo. I used an infrared thermometer to read the temps of the exaust manifold runners. They were all within 10 degrees. The manifold is so thick the heat transfer makes it hard to get an accurate reading for the individual runners. Sometimes I can cut the truck off and crank it right back up it will run smooth for about 30 seconds before it starts back to skipping. I was hoping someone may have ran into the same problem before.

Thanks,

Brad

[workinallthetime]

I have a 92 gmc truck with a 6.5 diesel. It has a bad skip. I loosened the injector lines one at a time. Lines 1,3,5,7,8 made the rpm's drop about the same.

Line 2 made the rpm's drop probably twice as much as the others. I could not access lines 4 & 6 because they are under the turbo. I used an infrared thermometer to read the temps of the exaust manifold runners. They were all within 10 degrees. The manifold is so thick the heat transfer makes it hard to get an accurate reading for the individual runners. Sometimes I can cut the truck off and crank it right back up it will run smooth for about 30 seconds before it starts back to skipping. I was hoping someone may have ran into the same problem before.

Thanks,

Brad

 

check your fuel supply pump, sounds like air getting into the system. also could be a restriction in the return side, take the fuel line off the top of the pump and route the fuel into a container and see if it runs better.

let me know

[workinallthetime]

I have a 92 gmc truck with a 6.5 diesel. It has a bad skip. I loosened the injector lines one at a time. Lines 1,3,5,7,8 made the rpm's drop about the same.

Line 2 made the rpm's drop probably twice as much as the others. I could not access lines 4 & 6 because they are under the turbo. I used an infrared thermometer to read the temps of the exaust manifold runners. They were all within 10 degrees. The manifold is so thick the heat transfer makes it hard to get an accurate reading for the individual runners. Sometimes I can cut the truck off and crank it right back up it will run smooth for about 30 seconds before it starts back to skipping. I was hoping someone may have ran into the same problem before.

Thanks,

Brad

 

check your fuel supply pump, sounds like air getting into the system. also could be a restriction in the return side, take the fuel line off the top of the pump and route the fuel into a container and see if it runs better.

let me know