Can't control EGT while towing

[DISTURBED]

Crack each injector line and see which cylinder is missing. pull the injector and swap it with another (Dosent matter of size) and see if the miss goes away

[Bponci]

Originally Posted by lvjunior

Checked the timing and it is still locked at 19.5*. Pulled the valve covers and the jamb nuts are all still tight checked a few valves for lash and the still check good at 8 and 18. Started the truck and it has a miss or stumble in it and hazes at idle and smells like unburned fuel

A cylinder leakdown test may be in order. Just a thought.

[lvjunior]

swapped injectors out for my old set and it is running fine. I think I got a piece of dirt in one of the other injectors. I am going to have them checked out.

The truck has no haze at idle whatsoever and the EGTs seem to be down substantually across the board. I could hit 1600° pretty quick now I have to stay in it hard for a while to get it past 1300°. The truck is running so much cleaner If I didn't know better I would say someone tinkered with the pump since I started this. The pump is set exactly where it was before. Looks like even I may even be able to slide the plate forward

[madmikeismad]

This whole time it was injectors? That sucks man.

Unless the "old set" is substantially smaller than what was in it, like stock.

[lvjunior]

The "old set" was the set that was running crazy hot that I started this ordeal with. The problem was the timing was set for the wrong pump and was at 14.5*. The injectors also have a 155* spray pattern and the needles have been turned to get more late fueling. Combining the late file and the wide pattern a think was putting the spray outside of the bowl causing my issues. I turned the timing up to 19.5* and have the DDP injectors in it. I also have a set of 5x11 145* injectors Will built for me that I am going to try for mielage after I get a new baseline

[collinmaune]

thanks for the info just fixed my egts also

[collinmaune]

whats the best set of 90 hp injectors that you can get towing for spraya angle not marine ijectors

[crewcabxlt]

i just fixed a truck with simular symptoms- found the cam gear broke on the end of the cam thru the 3 bridges in the center and relocked itself so it still ran but retarted valve train timing and it ran hot and gutless. swapped in a good used cam and runs good now. it looked like someone had heated the gear to pull it and shortcut a gear housing repair from a kdp incident.

[YOUNG GUNS15]

DDP3 or "370" injectors sure get some hate. I actually loved mine, I could control the EGT alright with a stock turbo and roughly a 10k load (several years ago now) The guy I traded them to loves them as well, they were clean and mean. Good to see that Will is helping ya out with your truck, will is one smart guy.

[lvjunior]

The DDP 3 injectors still haze a bit pulling. I towed my trailer yesterday and was holding steady at 1200* grosing 15000# on a 6% grade at 55mph in 3rd gear turning 2300rpm. Still seems a little hot but at least it's not 1300*

The 5x11 145* injectors that were backfiring got checked out and #2 had an issue. They are all fixed up and I am going to drop them in tomorrow night an try this drill again.

And yes Will does know his stuff. An he is very humble as well.

[madmikeismad]

Originally Posted by lvjunior

The DDP 3 injectors still haze a bit pulling. I towed my trailer yesterday and was holding steady at 1200* grosing 15000# on a 6% grade at 55mph in 3rd gear turning 2300rpm. Still seems a little hot but at least it's not 1300*

The 5x11 145* injectors that were backfiring got checked out and #2 had an issue. They are all fixed up and I am going to drop them in tomorrow night an try this drill again.

And yes Will does know his stuff. An he is very humble as well.

What's your timing at and what size charger? Your egts match mine with 5x.016s, maxed pump, and a s467, grossing 18k.

Sent from my DROID3 using Tapatalk 2

[YOUNG GUNS15]

1200 really isn't terrible, loose another 80-100* and you'll be right in the good area for towing.

[97rada]

1050-1150 i think is what cummins recommends for egt but Its been forever since I looked it up

[madmikeismad]

Originally Posted by 97rada

1050-1150 i think is what cummins recommends for egt but Its been forever since I looked it up

cruising or max?

[97rada]

Constant load/ cruising if I remember correct. No clue what spike is. I would think holding that much heat can't be good for long

[madmikeismad]

Originally Posted by 97rada

Constant load/ cruising if I remember correct. No clue what spike is. I would think holding that much heat can't be good for long

I held 1100 for most of my recent trip back from texas, 1200 for a few long pulls. Someone on here last year said that cummins said 1300 will last all day. Maybe it was for another motor though.

[Scooter's Roofing]

Originally Posted by 97rada

1050-1150 i think is what cummins recommends for egt but Its been forever since I looked it up

but that's at factory timing

[Gasoline Sucks]

My 62 with these 5x16 and 042 dvs has the same behavior "like hitting the power band on a small 80cc 2-stroke.". I was towing a 23ft boat on the highway probably 4-4500lbs egt would creep up to 1250 with any kind of hill and was 1100+ most of the time in OD at 65-70mph 1650-1750rpm 10 psi. OD off it would drop to 8-900 same speed 2300rpm 10-15psi. Pulled it up the skyway bridge with od off 4% grade 1100 20+psi 65 and I could accelerate to 70+ and stay under 1250. That was into a 20mph head wind and the boat towers over my truck.

What spring is in the AFC? My 62 is laggy to 10psi then it whips over to 50+. Its smoke free over 10psi but pours out smoke under 10. Will thinks dv swap will fix it so im gonna try it.

[95ram]

Originally Posted by Gasoline Sucks

My 62 with these 5x16 and 042 dvs has the same behavior "like hitting the power band on a small 80cc 2-stroke.". I was towing a 23ft boat on the highway probably 4-4500lbs egt would creep up to 1250 with any kind of hill and was 1100+ most of the time in OD at 65-70mph 1650-1750rpm 10 psi. OD off it would drop to 8-900 same speed 2300rpm 10-15psi. Pulled it up the skyway bridge with od off 4% grade 1100 20+psi 65 and I could accelerate to 70+ and stay under 1250. That was into a 20mph head wind and the boat towers over my truck.

What spring is in the AFC? My 62 is laggy to 10psi then it whips over to 50+. Its smoke free over 10psi but pours out smoke under 10. Will thinks dv swap will fix it so im gonna try it.

Mine acts similar to yours with 62/65/13, 5x12, and stock DV.

[Big Blue24]

The original posted ended up with two problems that combined helped the exhaust temperature and fuel economy results.

#1, we removed the DDP 3 5x.012" 155* injectors and installed a set of 5x.011" 145* injectors. This lowered temps around 100* as I recall but the truck was still running kinda warm and had a funny "powerband" after a funny dead spot around 10-12 psi.

#2, the owner discovered the governor arm was getting trapped below the afc arm and that's why there was a dead spot at 10-12 psi till the truck slowly made enough boost to force the governor back over the creeping AFC arm = power band.

Last I heard a few months back, the truck was running much, much better and returning much better fuel economy.