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CP4 recall thread (merged threads) - Y78 Jan 2022 recall campaign - Parts Available May 10 for 2020 trucks only

LenTex said:
Dropped my 2020 off this morning. Hoping it'll be done by tomorrow afternoon. SA set the expectation that they'd need it for "2 days" but I'm hoping that's just overestimating the job's time.
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LenTex said:
Got it back Tuesday afternoon. I think the truck is a little more responsive from a stop, and the fuel mileage went up a little bit.
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Went to the dealer Monday said it should be a few weeks then make appointment for install. Got my fingers crossed. Congrats on yours.
 
LenTex said:
Dropped my 2020 off this morning. Hoping it'll be done by tomorrow afternoon. SA set the expectation that they'd need it for "2 days" but I'm hoping that's just overestimating the job's time.
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2 days seems about average. Thats how long they had mine and others .
 
Mine will be going in on Monday… but I’m not feeling confident on the dealer! So wish me luck!
 
I have a 2020 3500 Standard output with the 68Rfe transmission. Mine has been done for 3 weeks. I towed my fifth wheel (14500 lbs) on a three hour trip. The engine is definitely more powerful. Power comes on hard and stays steady until I get up to speed. Very smooth.

Fuel Mileage has been about the same with 19-20 in combined driving and 11 mpg towing. I’m very pleased with the change.

Anybody put the new pump stock on a dino? It feels better than my 2018 HO. Also I’m using Power Kleen as an additive, should I keep doing that additive?

Thanks for any thoughts!
 
TigerRP said:
I have a 2020 3500 Standard output with the 68Rfe transmission. Mine has been done for 3 weeks. I towed my fifth wheel (14500 lbs) on a three hour trip. The engine is definitely more powerful. Power comes on hard and stays steady until I get up to speed. Very smooth.

Fuel Mileage has been about the same with 19-20 in combined driving and 11 mpg towing. I’m very pleased with the change.

Anybody put the new pump stock on a dino? It feels better than my 2018 HO. Also I’m using Power Kleen as an additive, should I keep doing that additive?

Thanks for any thoughts!
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Just my thoughts, but I would continue to use additive. This diesel fuel now is sorry at best! Just my thoughts.
 
I was hoping for better news...
Just had my truck towed back to Dealer. New pump is thumping and clicking like a VP44.
160 miles since repair. No towing.
I hope this is not a harbinger of things to come.
 
akamac said:
I was hoping for better news...
Just had my truck towed back to Dealer. New pump is thumping and clicking like a VP44.
160 miles since repair. No towing.
I hope this is not a harbinger of things to come.
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Im gonna assume/hope its a dealer mess up not an issue with the new pumps
 
Well harbinger of bad news I am.
SA called and Tech advised lifter or engine.
Engines are long term and lifters are short term waiting list.
Can't explain the high boost after HP pump replacement and they can't tear it apart until Tuesday.
Just a heads up for you guys taking truck in for replacement. Moniter boost pressure before and after the job.
I'm without truck for at least a week.
 
akamac said:
Well harbinger of bad news I am.
SA called and Tech advised lifter or engine.
Engines are long term and lifters are short term waiting list.
Can't explain the high boost after HP pump replacement and they can't tear it apart until Tuesday.
Just a heads up for you guys taking truck in for replacement. Moniter boost pressure before and after the job.
I'm without truck for at least a week.
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Thats gotta be coincidence as the pump swap would not cause that
 
akamac said:
Well harbinger of bad news I am.
SA called and Tech advised lifter or engine.
Engines are long term and lifters are short term waiting list.
Can't explain the high boost after HP pump replacement and they can't tear it apart until Tuesday.
Just a heads up for you guys taking truck in for replacement. Moniter boost pressure before and after the job.
I'm without truck for at least a week.
Click to expand...
Are you running 15/40wt or 10/30wt oil in your Cummins???
 
Well I talked to a local guy and got some good news from him. The noise is not an engine noise but a fuel pressure regulator failure. I can only hope that the Tech tests the changes made before failure as the root cause. The boost #'s I was seeing are a symptom of the failure. 2PSI going down hill with 0 throttle input, high boost low MPG's at normal operating parameters.
Thanks for the concern about the oil situation, but new pump new failure at 160~200 miles seems like the answer.
I'll post as the situation develops.
 
cummins2020 said:
Just my thoughts, but I would continue to use additive. This diesel fuel now is sorry at best! Just my thoughts.
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What additive do you use? I used x3p, Lucas & trying amsoil. All have cetacean boost, lubricant. But the amsoil seems to clean injectors. Just interested
 
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