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Nomad777

Hello Rawze,

Thank you for the reply. You've asked a lot of good questions that I know these shops didn't even consider diving into. I am shaking my head over here. I really should've just kept the truck the way it was. I will respond to your questions in order.

- Make/model: 2014 Peterbilt 579.

- Make/model engine: Recon Cummins ISX15. Serial 60837650 Date of Mfg 03/28/19. Not sure if this number is needed but I'll give it anyway DR7046-RX.

- Miles on truck 815,000.

- Miles on Recon Cummins 250,000. Miles on fuel pump I would assume to be the same as long as they didn't reuse the fuel pump from the original engine. I was told by Cummins over the phone it was a FULL recon. I have the original and recon engine build sheets in the truck. It's parked an hour and a half away from the house. I'll make a trip and go get it. In the list of updates on the build sheet it did not mention the fuel pump being updated. Pistons and rings were mentioned to have been updated in the recon build.

- I would definitely like to get the program reviewed properly. I'll get a copy of the program off the ECM as soon as possible.

- I clicked on the link you provided and I didn't have permission to view. The only test I am aware of anyone performing was an injector test. It made the truck ramp up RPMs and drop them quickly and repeatedly. There were six parts to the test (I am guessing injector count) and 4 tests to each of the six. Injector 1 initially passed. When the test got to the first and second parts of test 3, injector 1 started to fail consistently moving forward. I hope that was helpful. I will try and get the name of that test and let you know. No one mentioned a "rail leak-down" test being done.

- No one has bothered pulling the fuel pump apart. The second shop said if my problems persisted then they would dive into the fuel pump. I personally think it must have something to do with the programming, since the first time I noticed the fuel economy being off was immediately upon receiving my truck the first time from the first shop. However, I am certainly no expert in the matter and just going off my gut. I could very well be 100% incorrect. If the ceramic rods are present in the older fuel pump then maybe this is all just terrible timing. We shall see moving forward.

- Unfortunately, I didn't get that advice to start. I wish I had. Peterbilt advised changing the injector would save time and money on troubleshooting and solve my problem for sure. Wonderful advice there. No one bothered to change the injector and matching quell-tube with another. They simply replaced the injector and quell-tube (unsure if even programmed properly) and called it good.

- I need to have the shop check the SCR and make sure. They didn't mention the SCR but then again they probably didn't bother looking. Do all sensors need to be removed from the SCR as well?

- I don't think anyone bothered checking the decomp tube.

I am grateful I was referred to this forum by an old friend. The questions asked in one reply shows far greater knowledge in the field than these folks I've been dealing with. I'm glad you're providing such a useful tool to us truck drivers.

Thanks Rawze.