Engine/Transmission (1998.5 - 2002) truck has a miss only with edge on

[timbo]

Any ideas would be helpful because i'm out of ideas!!!! Several months ago i installed 125hp jammers with my edge comp. WOW! I could only run the box on 2x2 or clutch would slip. So i let the edge box turned off for about 3 months til i installed my con ofe. With the edge off truck accels smooth as silk, but when i turn the box on(any level) engine misses Very noticable in 4th and 5th when on a hard pull. :{ Fuel press. is 10 psi wot. I have my guage tap right on the shrader on the side of the pump. I also moved the ground wire to the batt and soldered the conn. No diff. So next idea cost me alot of $$ New vp44! Installed that, and DID NOT tap the pump wire yet for warr. reasons. TRUCK STILL MISSES with edge on any level :{ Next i call edge and they wanted me to send the module in to check it. So i thought while they were doing that, upgade to a drag comp!!(cost $125). Just got it back friday, boy i was like a junky waiting for a FIX!! Hooked it up rightaway. Still did not tap the wire. GUESS WHAT, STILL MISSES :{ Out of ideas and tears!! I,m thinking about getting rid of the edge ang getting a smarty. I can't imagine it would be the injectors Because its smooth with out the edge on.

 

[MCharlebois]

is it cold where you are?? plenty of reading if you do a search... ..... i have put 105k on my truck. first with an ez and then a drag comp,it runs a little ruff when the temps drop

marcel

 

[DavidC]

What year truck?. Please fill out your signature with all truck info. When I had a miss with the DDUFM they requested the box and wiring harness be sent back. They sent me a new box and harness and all has been well since. During this miss tho I would get a check engine light and a code 253, injection pump timing (if I was leaning into it pretty hard). If I was just driving the truck normally it felt like it had a slight miss all the time (no codes set) until I completely removed the wiring harness. I have the factory stock injectors.



Dave

 

[Chrisw]

I have had this trouble ever since I put large injectors in my truck. Sounds just like mine. The more fuel you add the worse it will get. the more timing you add the worse it gets. Try cruse control and see if it's a little better at lease is seems to be on mine. I have tryed blue chip, Edge, tst and now I run a JVD box, The more timing I add the worse it gets. I haven't found a fix yet. Cold weather seems to make is worse. I can play around with my smarty box and the timing seem to have the biggest affect on if. but ever time i add more fuel is still there.



good luck

 

[REDDODGE]

i have the same problem. Tried the smarty from bob wagner and it still did this. It has been unseasonably warm in chicago and i noticed the truck didnt do it . Im waiting for spring to make a decision. My truck ran great last summer. I havent pulled a code in a long time and i tried three different comp boxes all with the same results. I feel the cold weather is somhow causing it.

 

[timbo]

Mine seems to be better the longer i drive (30 mins or more). I Also think its big injectors. Chris what injectors did you have before the mach 4. 8s.

 

[timbo]

REDDODGE did you notice this problem right after the jammer install, and did you go from stock to the jammer 5s right away.

 

[REDDODGE]

I didnt notice it after the injectors but i hadnt put the big clutch yet in so full throttle on kill wasnt an option. I dont remember having the problem after the clutch install i could run through the gears without a problem. I wonder if the new diesel could have some effect. I dont run 5x5 very often so i cannot figure out when it started.

 

[Chrisw]

Chris what injectors did you have before the mach 4. 8s.

BD5's.



4. 8 will stomp the bd5 in bottom end and top end fueling.

 

[Steve St.Laurent]

I had a problem that sounds just like this that drove me nuts for nearly a year. I was using a TST box and no matter what I did I had a miss any time the box was on - and I'm talking a BAD miss, it acted just like a loose pump wire. I soldered the pump wire, resoldered it, soldered the positive connection to the TST harness, moved the ground to the ground wire going into the ECM, cleaned MAP sensors, tried a new harness, etc. In the end it ended up being a bad alternator (thanks Mark @ TST!!). One of the diodes was evidently bad and it was leaking AC into the system and making the box go nuts. The truck ran perfect with the box off and had no other symptoms. I tested it by disconnecting the battery cable attached to the alternator and driving the truck for a few minutes. Warning - I've been since told that running with the batteries disconnected from the alternator could fry an otherwise good alternator. In my case I could tell by the end of my street that it was the problem. Put a new alternator in and it's been great ever since.

 

[ERuhl]

Put a new alternator in and it's been great ever since.

Interesting, glad to hear someone was able to fix this. I've resorted to running without the box during the winter because the miss/shudder is so friggin' annoying. I was going to try a different box hoping it was specific to Edge, but I see others have tried several vendors with the same results. Seems like an odd coincidence that it showed up only after new injectors, but I'll check out the alternator.

 

[GOT-Torque]

Steve, was your miss occuring all year long or just when it was colder outside? I would assume an alternator issue would cause the miss anytime of the year?



I've experienced this exact thing as well. First with the edge and DDII injectors. Then with the box and Mach 4's. I sent it back to Edge, upgraded to a drag at the same time and now with the twins and mach 4's, it is still there. Like others have said, smooth as silk with the box off, but with the box on, the miss or hesitation comes back under acceleration.



One thing that is for certain, it only occurs when it is colder outside. For me, it is anytime it is less than 60 degrees outside. The colder it is, the worse it does it.



I am starting to think it is maybe due to cylinder pressures, since in the winter, cold air is denser and therefore you get more air in the cylinder. Maybe the advanced timing and increased cylinder pressure causes it to fire too soon and hence the miss/hesitation???



I would love to get this solved so I can use my drag comp year round.

 

[timbo]

Well Steve i was really hoping that was it, as it does make sense. the more i thought about it at work today i thought thats got to be it! I just tried it. Does the same thing. THANKS for the idea and i'm glad you found your problem! I just ordered 75 hp injectors. I agree with GOT-Torque its got something to do with cyl. pressure and temp. I think that, combined with a little worse spray pattern of the bigger sticks,and added timing causes a misfire at times. My plan is to back down on nozzle size and turn the comp on. Than i can get the added benefits of the timing. Now the edge box is completly useless to me. It just makes me mad every time i turn it on! I'll let you guys know how i make out. It's a real pisser i just paid $125 for the drag update and can't even use it yet.

 

[Steve St.Laurent]

Steve, was your miss occuring all year long or just when it was colder outside? I would assume an alternator issue would cause the miss anytime of the year?

Year round. Took me almost a year to figure out the problem too!

 

[jdrury]

had to put a new vp44 on my sons truck a month ago - so i decided to install a set of stage three jammer nozzles while i was in there. my truck does the same exact thing, runs fine with the comp box off and misses with it on- doesnt miss when you are on it hard but just as you ease out of the pedal. very aggravating. i read somewhere that maybe the apps may need to be reset?

 

[Cummins724]

I think it is possible that you guys are experiencing fuel starvation with the HO trucks. I was told that the HO pumps can't support large injectors like anything bigger than mach 4's. Most of the posts on here are from guys with HO's... . is this a possibility?

 

[GOT-Torque]

Mine started with DDII's and an edge. Certainly not at the limit of the HO pump at that level.



Thinking of cylinder pressures, all HO trucks have a slightly higher compression ratio than SO trucks...

 

[Steve St.Laurent]

I think people need to be more specific as to what the miss is like. I see a couple different types talked about here. There is the "stutter" when letting off the throttle at high box settings - I see at least one guy talking about that. Then there are misses when accelerating hard, then there's surging when at steady throttle settings (cruise). The misses I had on my truck happened any time the box was fueling (green light on the pmax box lit) and the light would flash on and off with the miss. It was very violent because it was just like turning the box on and off.

 

[MHagen]

I also have misfire at WOT when I pull heavy running #2 diesel. Im not sure why but when I run 20% biodiesel or higher it goes away. Im not sure why but mabey this will help someone smarter than me figure this out. Mabey Bio has a higher viscosity possibly boosing pump pressures?



Mike

 

[ERuhl]

I think it is possible that you guys are experiencing fuel starvation with the HO trucks. I was told that the HO pumps can't support large injectors like anything bigger than mach 4's. Most of the posts on here are from guys with HO's... . is this a possibility?

Mach 1. 6's here with an EZ, well within the capabilities of the VP44.

I think people need to be more specific as to what the miss is like.

Mine happens only under load (climbing a hill or hard acceleration) and seems to be worse at moderate-to-heavy throttle. It seems to get a little better at WOT and goes away at light throttle. It feels like a gasser with a spark plug wire randomly shorting out to the block thus causing an intermittent miss. Super annoying on long climbs. Fuel pressure is a steady 10 psi while this is going on.



When I had the TTPM I put it on the "timing only" setting and the problem still existed. Adding fuel made no difference at all and when I removed the TTPM it was back to smooth-as-silk operation so it is clearly a timing issue. So I sent in the TTPM which is apparantly no longer offered as they replaced it with an EZ. No change. With the apparant temperature dependance I swapped out the IAT sensor, no change. So for now I'm using it as an expensive boost fooler until the weather warms up.