JHFIII

The 1/2 turn was just how much to back the stud out once you bottom it in the block before you put the nuts on. The purpose of the mark on the stud was to keep track of how far the stud turned back towards bottoming once you started torquing the nuts.

I just did mine. As others have said, its a one at a time type deal. I used the glacier diesel method which is kind of a pain in the butt, but I do feel a little bit more secure about the install. Pro tip...grab a crosscheck paint marker so you and put a line on your stud and the nut so you can watch that your 1/4 to1/2 turn back off of the stud doesn't shift too much on you, and you can one on the nut to keep an eye on those.

I ended up sending out the email to Auto Computer Specialists (where the reman originally came from). Below are all the faults they found. I have no idea how it even drove at all. Releived they found the problems because I was tearing my hair out, but this was a unit that was about a year and a half old with maybe 40mi worth of driving. Strange thing as well was I had 5 volt ref, all gauges working, as well as proper lift pump circuit function. OUR FINDINGS: No Communication to Lift Pump, Lift Pump and APP Circuit in Short, No 5 Volt Reference, No 9.5 Volts and Lose CPU! REPAIRS PERFORMED: · Replaced Lift Pump Circuit · Replaced Flash Chip · Resoldered CPU · Replaced APP Circuit · Replaced 5 Volt Driver · Replaced 9.5 Volt Driver

Thats the conclusion that I'm reluctantly coming to as well. Im thinking the ECM the more likely culprit just because the vp is a DAP unit with new PSG. Obviously new parts can be bad though. Looks like I'll have to pop the reman ECM off and send it over to Auto Computer Specialist. As luck would have it, its just past warranty. No, I technically have not. When I did the ecm repair it was September last year. I was preparing to move across country, so I just installed it and idled and ran ok just riding around the neighborhood so I turned my attention away from the truck. For the record, the vp wasn't changed out of necessity, I just had an hrvp44 in it that had a lopey idle which I hated. Before the oem ecm went out, I never had a lick of trouble out of the truck.

What I dont get is, obviously thats a problem, but is it THE problem since it was misbehaving with the Quad can unplugged? Wouldnt it just default to stock timing?

Well, no joy so far. I unplugged the CAN cable from the quadzilla and its still doing the same thing. Worse tonight actually. Always nice when it acts up right by your house instead of 2 miles down the road. Surging under even very little throttle and at idle tonight. The one thing I did notice is that the thing at idle seems very high. It was 16.5-17deg at idle. I dont know if this makes any difference but when I did my short test drive tonight, I did have the quad on, pl0, with the can unplugged. Hers a vid of it struggling for idle. This is after I plugged the CAN connector back in so I could get some data logs.

Interesting...I havent noticed any funky behavior on the iquad, but that doesn't mean anything. Btw, I have the power and ground set up like you suggested. Actually, after the wt mod, I made a copper bus bar from the pdc b+ to the unused stud, so now I've got two. The ground is run to a blue seas common ground bar on the fender which is referenced to the body and b-.

Will do. I'll report back. I have no idea what firmware version the unit has right now. I bought it about a year and a half ago. Might have to give that a shot as well

Here is a video of how its behaving. This is just driving in my field in circles at 20mph, so in this instance it's at a lower speed than the original post, but it will for certain do this on the road, but rarely driving slowly. Sorry about the angle. https://youtu.be/Zc4xUhwguho

I just have the out of the box tune on it. I havent done any custom tuning at all yet. How can I tell what the stock v2 timing is set at? I couldn't find anywhere in the app with that info.

Hey guys, I've been fighting a heavy bucking and surging issue for some time now. My truck is essentially undriveable, and Id appreciate any insight on where to go from here. Symptoms: Ranging from light to heavy throttle input as long as the engine is under some load, it will develop a violent surge at about 35mph plus. It surges and bucks very badly and on my test drives within a couple miles of my house, its all I can do to nurse it home. It sounds like the footage youve seen of a WWII fighter getting shot down, when it starts to sputter before it catches fire. It idles just fine, and once I get it down to about 20mph it starts to behave again. It seems to worsen when the truck is warmer and the weather is colder. There are no error codes present. I believed I had fixed the issue previously, because the #2 injector line was not sealing correctly and air was getting into the line. I discovered a marred crossover tube which was replaced and now all the the lines are bone dry. I had one successful test drive about a week ago, where I went about 5 miles without issue. If I recall, it wasnt super cold that night (40's or thereabouts) Recent repairs and relevant performance modifications: Industrial injection Silver 62 turbo and II 120hp injectors Quadzilla Adrenaline Iquad running the stock V2 tune (I have a clue that the timing here could be low for the injectors, its about 13 at idle, and I have not been able to keep my eye on the phone while driving to see what it is at when it starts to miss) Newish ECM from auto computer specialists New VP from DAP All upgraded Battery cables and WT ground mod done Alternator testing at .03VAC Timbo APPS New Cummins MAP and Cam position sensors recently as preventative maintenence Fuel pressure rock solid (perhaps even a bit high) at 22psi with the fleece dual intank system and fresh fuel filter Fresh fuel All ECM VP grounds etc are new and clean I have checked and rechecked power and grounds to the vp and ecm many times. Id greatly appreciate any ideas on what to test next. I miss driving my truck!

Thank you and Dieselfuture for the kinds words. It took a little bit of work. I can assure you there are plenty of rusty, oily and sharp things still there! Awesome pics Tractorman! Down here in Nampa we just have the bracing wind and light snow dustings. Sunsets are pretty sweet though. Alas, my misfire/bucking issue persists. Im going to start another topic on that.

Wow, Thank you guys. Never ceases to amaze me the amount of experience and effort people on this forum put out. I tested my new alternator full warmed up with no acc on and she holds solid at .03. That seems acceptable. Just to add some detail, I was having a bad misfire when I got up to about 45mph. Previously I had changed out a bad vp44 for a DAP unit, and I also had a totally blown up ecu just prior to that, most likely from either a bad ground or the bad alternator I just switched out. In any case, I had been chasing my tail because I had no codes whatsoever and was beginning to doubt the new ecu, or think the apps was going. It almost felt like the vp44 was turning off and on. Up to this point I had -Done the WT mod -Changed the apps over to a timbo -Verified wiring integrity ad nauseum -Changed alternator (The apps and the alt needed to be changed regardless, so I didn't waste any money) And my whole charging cable system is pretty bomb proof, all marine 2/0 tinned lugs, mil terminals etc. Welp, yesterday I found the culprit. See pic below. The #2 injector tube got buggarred somehow. Some junk mustve got into the line nut the when I changed the vp. Dont know how, I'm pretty good about cleaning things that touch sensitive things. It was hiding behind the air horn and weeping just enough fuel to not be noticeable. Luckily I had a spare set of injector tunes and sanded the flare very lightly with some 1300 grit. Sealed right up and runs like a raped ape now. The irony of the whole affair is if someone had the same symptoms and asked for my advice the first thing out of my mouth would've been, "you're getting air in your lines somehow" So, thats my Slingblade moment. "It aint got no gas in it" Btw, Mike, I did consider Durability in Nampa. There is usually a pretty decent fish and chips food truck parked there, too! I just wanted to try thr off the shelf option of the 160a Durango hairpin. Seems to be working pretty well so far!

Understood on the fully warmed up truck. Ive been dealing with some other issues, but it should be ready to test drive now. The alternator should be the last piece of that puzzle. The old alternator was causing some wicked tcc cycling issues and simultaneous apps issues. Ill test it on a warm truck no acc and update.

I did have them test it at the store. It "passed" with .36vac. For reference, there were no accessories on in the vehicle during the test in the video. Only the grids cycling. In the vid, I think it was down to 1 grid cycling at that point bc with 2 cycling it was at 1.65vac vs the 1.0 seen in the vid.