Bad Injector Pump?
 

First off all back ground information, It's 92 w250 with DDP 100hp injectors, stock pump and turbo. After I put in the new injectors I was having low rough idle so I turned up my low idle to help it but was having run away problems in park and neutral. Been tinkering with it to find that good balance. Then I had my starter go out. Changed the starter, drove it home, it sat for a day and now its not starting at all, will just keep rolling over. I checked all the fuel lines at the injectors theyre all getting fuel so I do not believe its the FSS. I believe between my limited adjustments and bad idle Ive had with both injectors and now this the IP is bad. Anyone have any ideas??? Need my truck back its my daily driver.

With my limited knowledge on the P pumps I would say check the timing,maybe the governor springs. I have heard of people having starting issues with these because of timing adjustments. If you are getting fuel and you have good compression it should start. maybe a p pump guy on here will chime in a help you out.

In a 1st gen we dont have P-pumps unless a conversion was done, the pump we have is a VE44, Ive heard the same issues with those DDP injectors, i do think they need a timing bump, looking at the motor rotate the pump counter clock wise 1/8 inch and see if that helps, honestly idk why people buy those injectors, branding maybe? and those injectors are far to big for the stock turbo they are too big for and hx35 also, i have stock injectors and a maxed pump with and hx35 and i can peg my pyro in a heart beat. is there a reason you want 100 hp injectors? other than power? max the pump first then go with bigger sticks after a turbo upgrade.

I must be confused I thought the evolution was from the P7100 to the VE44 some time in 1997 or so. Maybe I am backwards thanks for the info. I try to help people out specially when you see 250 views and no one says a word thanks for chiming in.

it went ve44 89-93 to p7100 94-98.5 to vp44 98.5-07? i cant remember how long they use the vp44

1998.5 to 2002

The sad part is there injectors make good power but there cust service sucks and they seem to fail.. not sure why.. i had a injector torch a piston way back and lenny was a pain in the ass to deal with.. back then they set the pop presure at 240 bar now they set them at 245.. took them a while to realize the springs do settle and wear in.. but man i loved the way there 4 hole injectors perform.. i did buy another set but honestly am afraid to put them in.... i think i will get them flowed and pop presure checked first..:c:

yea ive heard that about them too which is why ive decided to go to DAP and get these Diesel Auto Power Aftermarket Performance Injector 5x0.014 SAC 155* Up To 90HP - VE5X14SAC155A - Diesel Auto Power, LLC

Sorry meant to say pump has 3200 spring, I was going to upgrade the turbo with this but now I'm dealing with this so I don't want to start spending if I need a new pump, I'm going to remove them and throw my old one back in and see if my problem goes away

keep the 3200 spring, i would bump the timing first before anything

keep us posted...:c:

You're saying bump the timing and see if it fixes my problem or put old injectors in and bump timing?

I personaly would put the old injectors in and see what happens.. bumping the timing will wake it up but you should not need to do that for it to run correct with new injectors..

If the injectors are spraying fuel into the cylinders, and it is not starting, it would be smoking white smoke out exhaust. When cranking with the accelerator pedal at WOT, are you getting any exhaust smoke?

Yes I'm getting white smoke when I try to turn it over, I actually got it running for a little but it's stopped and same problem now

The white smoke tells you it is getting fuel into the cylinders. However not enough heat (compression) or timing way off or the injectors are not atomizing (spraying) the fuel correctly. I would start with putting the old/original injectors back in, since that is when this all started to happen.

What would cause timing to all of a sudden be way off, honestly never had any problems until these new injectors, now I'm hoping they didn't damage something else, I'll try and get the old ones in tomorrow, any suggestions for new injectors?

I believe that is nothing better then original Cummins parts, but that doesn't fit into this site.
I don't think your timing went off, I was just mentioning that might be a reason for white smoke. I think something went wrong with those aftermarket injectors. It is a good cheap place to start the troubleshooting.

I'm having the same issues except injectors are stock. All that's done is Pump tuned. But been that way a while. Went from running to noting in the matter or 2 hours and never touched the motor. I have good compression can't see anything saying timing jumped the keyway for the pumps not sheared. Pummel and cleaned all the injectors I have fuel to the injectors im only get a little white smoke out the exaust when cranking it over. Any help is much ly appreciated.

stock pump ,big injectors mean low idle, you need to turn up the pump pressure,

Like in zero weather, when you are having trouble starting a diesel, always press the throttle pedal right to the floor WOT (wide open throttle) until you hear it doing more then just spinning with the starter.
Just a basic question. When you "bleed the injectors", you would have all the 3/4" wrench sized nuts at each injector loosened about a turn. As you crank the engine to get ALL the air out, you will see each injector (fitting) squirt a decent amount of fuel as it goes through the firing order. It makes a mess, but if you have ANY air in the fuel system there will be a lot of problems up to not being able to start.
Now if I had all the injectors bleed thoroughly, nuts tighten back up, I might disconnect the electric grid heater and as someone was cranking the engine over, squirt a SMALL amount of either into the intake. AGAIN, ELECT GRID HEATER DISCONNECTED (otherwise it could cause the either to explode inside the intake) and as the engine is turning over with the starter. This way the either doesn't go all into one cylinder and cause problems. As you do this, it should start on the either and will stop running when you stop the either or will then run on the fuel. If nothing at all happens, no knocking noise or anything, use a little bit more either until, as it is cranking, something starts to happen. If it stops running when the either stops, the fuel isn't getting into the cylinders in a usable manner or at the correct time.

DDP's are great sticks, but the larger ones can cause white smoke on an IC first gen as they are the wrong spray angle for an IC bowl.

Just curious why you thought you need +100 DDPs...what mods/air do you have to warrant these sticks?