Krlspokane12

So i got the VP installed yesterday and i scanned for codes following installation. The following codes were present after initial start up. P0237- MAP sensor low voltage P1693 I cleared the codes and went for a test drive. As of this morning, no new codes were present. I will hook the scanner up when i get home and see if it through any new codes. During my test drive yesterday and my drive to work this morning, i experienced no issues with dead pedal or hesitation.

I just got the pump back today, so I'll be installing it tomorrow and checking for codes then. I'll remove the quad tomorrow while I install the pump. I'll let yall know my findings.

So today while I was looking over the wiring, I remembered that a few times since I installed the pump the engine temp reading on the quadzilla would sporadically drop to -40 degrees for a few mins and then jump back to 185. Not sure if this is part of the same problem I'm having. The sensor is less than a year old and I did get it from Cummins, so is this indicative to a bad/ going bad ecm? Not sure if the temp issue and the dead pedal are part of the same issue or 2 separate issues. Just thought I'd mention it while I was thinking about it

A friend of mine has a snapon scanner that we will hook up after we put the pump back in on Monday. I'm looking over the wiring tomorrow to make sure I don't have bad ground or exposed wire. I'll check the WT as well, thanks for the reminder.

From what I know, Mastertech is a certified Bosch rebuilder. I spoke with them in length about this and they stated they only use genuine Bosch parts for the rebuild. This is the 3rd pump I've got from them and have never had any issues.

Hey Guys, I really need your help on this one. I have been chasing an intermittent dead pedal and hesitation issue and I'm not sure what could be causing it. It does not happen all of the time, there will be days that i drive the truck and it doesn't happen at all and other days where it happens multiple times. It doesn't matter if the engine is warm or cold either. It usually happens under acceleration, but it has happened while cruising. I will go to accelerate from a light and nothing happens when i push the pedal for about 2 seconds and then it will kinda sputter and then accelerate like normal. I put a new VP on the truck in July and after talking with Mastertech diesel here in Boise, they thought my new pump might be going bad already so i took it back to them on Monday to be tested and it passed, so i know that is not the issue. There are also no codes or check engine light. All of the following has been done to the truck. so I'm not sure if I'm chasing an electrical gremlin or the new ECM is beginning to fail. Any insights or trouble shooting help will be greatly appreciated as i don't just want to start throwing money at random things hoping it fixes the problem New batteries in April New alternator last year New battery cables New ECM in 2021 New OEM MAP sensor in 2022 New OEM cam sensor in 2021 New VP in July 2024 New Timbo APPS last month WT wire mod Air dog 100 and 14psi of constant fuel pressure

W-T mod is complete and BD noise filer is removed. I haven't had any issue since, seems the truck runs better and feels smoother while at idle. Not sure if it's just me or not but I'm not sure why I waited so long to do this upgrade. Now on to other electrical problems.

W-T thank you for the detailed explanation. I went out and checked last night and my truck does in fact BD noise isolator. I will remove it this weekend while performing the ground mod. I still have not had the surging issue again, but i did notice something else on my drive into work today. My boost pressure was spiking while on the freeway cruising at 65mph. It would bounce from 4psi to 16psi on my Quadzilla monitor. I will look at pulling the MAP sensor and replacing it with a spare i have to see if that fixes that issue.

I know the 3.55s are not the best for the 35" tires. My plan is to eventually re-gear the truck once i have the funds to do so. As of right now, i don't really have an issue with EGT's, i have a hard time getting it over 1250 at WOT. I can say that the issue I'm having does not feel like a tranny problem, I can feel the truck speed up and then slow down. It happens for a 2sec period of time but it is not consistent. it will do it a few times and then stop and then it will happen again. It also happens at varying speeds, sometimes accelerating from a stop light to cruising speeds.

I have reset the APPS, I'm not sure if it did anything since i have not had the surging problem again since i posted this thread. I will see if it happens again sometime again during this week. I will still check the VP wire tap and perform the WT mod this weekend. I hope this will solve my issue for good.

This morning I opened the Quadzilla app on my phone and watched engine load and throttle position. Not sure if this is as accurate as a live data tool, but its all I had at the moment. But of course it didn't surge this morning . I will drive it again at lunch and see if it does anything. This is such a PIA since it seems to be completely random. Once I locate my multimeter that wandered off i will test the tap wire on the VP. I will check the Quadzilla ground once I get home. If this turns out to be a bad APPS, it will be par for the course, I keep getting crap parts that are supposed to be good since I bought an Alliant APPS from Thoroughbred diesel.

Okay, I have reset the APPS. See if it makes a difference in the morning. I could not test the alternator since i cant find my multimeter, it must have grown legs. I will try to find it this weekend and test to see if there is any AC noise coming from the alternator. I was thinking about it today and correct me if I'm wrong. Could this be a VP issue caused by the wire tap from the Quadzilla? The last few times this has happened was after a hard acceleration where the pump tap was engaged from the Quadzilla (running tune 4 of 6). There are custom tunes based on input from you guys (much appreciated) So today at lunch I lowered the power setting to #2, I had no issues what so ever at all. I shut the truck off probably 4 times making different stops during lunch and nothing changed, the truck ran flawless. Also, on the way home cruising on the interstate, no surging, it never missed a beat. So this is either a coincidence or it really is that random, let me know your thoughts. I plan on doing the the W-T ground mod this weekend since I have been planning on doing it for awhile, but not sure if might help solve this issue or any of the other weird dodge wiring issues I'm having, but that is a topic for another post.

Okay thanks, I will try to get that checked tonight. The alternator is new so many i got a bad reman. I was also thinking of resetting the APPS, not sure if that will make a difference or not.

Hey guys, I hope everyone had a nice holiday season. I believe that I have another random electrical gremlin but not sure where to start. So, it started the other morning on the way to the office, the truck started randomly surging as I was cruising down the interstate. I was traveling between 65 and 70mph, and it feels like the truck is accelerating on it own. I can hear the engine raise RPM’s about 100 RPM and I can feel the truck accelerate for about .5- 1 sec, then it goes back to normal and then it happens again. It is totally random, sometimes it happens at slower speeds and sometimes it only happens when driving at highway speeds, and sometimes it does not happen at all. I noticed this morning that it was still surging even while I was giving it throttle while driving. So, I’m at a loss here since there is no CEL or codes. The VP is new and has about 6k miles on it, I replaced the APPS last summer, the ECM is new, the batteries are new, the battery cables are new. I also have not noticed any changes in the gauges, they all still work and seem to always be functioning correctly. Except sometimes the lift pump pressure is low, it stays at 11psi and wont go up to 15 where it normally is, unless I shut the truck off and start it again, then the pressure will be 15, but again this does not happen all the time. Sorry for rambling and I hope yall can make sense of this. I’m just not sure what rabbit hole to jump down yet.

I hope everyone had a good Thanksgiving. I need your guys help with this, I’m trying to perfect my daily tune to maximize power and fuel economy. I was finally able to swap out the DDP 100hp injectors with some DAP 100hp injectors (so much better) Also, the truck does have 35x12.5 with 3.55 gears, I know it’s not optimal but I don’t have time or money to re-gear the truck at this time. Below is what I’m currently running, and any input would be much appreciated. Power levels: 7 RPM limit: 3400 Max valet mode power: 50 Pump stretch: 1400 TPS pump max: 100 TPS pump min: 20 Min pump tap fueling: 0 Pump low boost scale PSI: 12 Boost scaling: 40 Load timing: 1 Low PSI timing reduct: 3 Timing reduct scaling: 50 Light throttle timing ADV: 3 Light throttle timing load limit:40 RPM timing max: 1500-13 2000-17.5 2500-22 3000-26.5 Max:28 CanBus fuel 0-85 1-86 2-87 3-90 4-95 5-99 6-100 7-100 8-100 9-100 10-100 11-100 12-104 13-108 14-112 15-116 16-120 18-124 20-128 22-132 24-136 26-140 28-144 30-148