Diesel engine with a miss.

[orangeandgreen]

My 4020 sounded like it has a miss when the lift pump was going bad. It idled rough and didn't have the power when it was called on.

 

[archie804]

ULSD (the fuel you get now) is very hard on injector pintles on older engines that were designed to run diesel with a higher sulfur content (which is why I recommend a diesel additive like Caterpillar Additive. It provides the lubrication that ULSD lacks. ULSD is also hard on mechanical pumps. Blame it on the tree huggers.

Sounds to me like you dropped an injector pintle.

Thanks for this information it was very helpful.

 

[ch1ch2]

Thanks for this information it was very helpful.

Thanks for reviving this thread.

 

[Redlands Okie]

Ch1ch2 what was the problem and how was it fixed ?

 

[ch1ch2]

New fuel, fuel additive, and the problem went away after most of the tank was used up.