Archived After decent run - let off go pedal - truck died - no re-start

[Joe Mc]

Took buddies son out to show him how a hot rod diesel runs. Got temp up over 140 then poured the coal to it - had a good run w/comp on 5/5 and then went for another run. After letting off go pedal (second run) truck died as I was rolling up to a stop light. Popped in neutral and tried restart - no go. Put in park and tried again, nothing happening. $65. 00 flat bed home and pride hurt more than anything else at least at this point.



Have good LP psi - 22 psi, cranks like all git up but will not fire. Flat bedded home, so at least it's safe.



So, what's your guess? VP?



Truck has 179 k - I got it w/75 k, did mods @ 140k, still has same VP as when I got it. Don't recall check engine light coming on at all when it died, but I'll check for codes in the am. My guess is the VP took a krap.



Figures - especially when I'm trying to show my buddies son what a hot rod diesel is all about#@$%!. At least he said "man this thing runs like a raped ape - then on the next run it dies - he says too bad it broke on us. :{.





What do you guys think? ? ? ?

 

[Steve St.Laurent]

It's probably just lost it's prime. Not an uncommon thing on a VP44 equipped truck that's cranked way up. Try cracking your injector lines and bleed the high pressure side like you did when you installed your injectors (assuming you installed them). 99% that's the problem.

What seems to happen is the cylinder pressure when you let off the throttle sends air back into the injectors and then with the air in there they can't build enough pressure to pop off.

 

[Mishkaya]

It's probably just lost it's prime. Not an uncommon thing on a VP44 equipped truck that's cranked way up. Try cracking your injector lines and bleed the high pressure side like you did when you installed your injectors (assuming you installed them). 99% that's the problem.



What seems to happen is the cylinder pressure when you let off the throttle sends air back into the injectors and then with the air in there they can't build enough pressure to pop off.

Most likely the cause. It's scary the first time it happens, but you get used to it.

mishkaya

 

[Joe Mc]

Well guys this is befuddling at the least, and I hoping that what both of you say is correct.



Now that the cobwebs have cleared from last night's events (buddy's mom's 75th birthday party) the first run was a simple take off and floor it to about 75 +/-. The second run was a boosted (10#) power brake take off, spinning the wheels through 2nd & part way into third then a run up to about 90 and then a quick off the go pedal (of course big whoosh from the 64/14) hit the brakes to slow for the turn ahead - this (when I let off the go pedal to hit the brake) is when I noticed it wasn't running anymore :{.



I tried to restart last night and it just cranked - like when I put injectors in before (4 times) - then after a few times trying to restart it would sound like it tried to fire - you know a bit of a kick but no fire "just like" after the injectors went in until fuel got to them.



Anyway, this morning I put the code reader on and "PASS NO CODES" tried to start and it was still trying like last night but wouldn't. My thought was to crack a few lines and see if fuel was present. But, I figured I'd check the TDR 911 first for replies. Now that you guys have replied I'm feeling better about this whole scary situation, which by the way has never happened to me before and I've owned the truck since 01 and it's been bombed since 03. But "there's a first time for everything" and I'm hoping this is the problem. So I'll warm up and dry off a bit (cool out there and raining 'of course' this morning) then go crack a few lines and see what happens - keep your fingers crossed for me .



More to come . . .

 

[Joe Mc]

SWEET! All is well again Oo.



Cracked #1, 3 & 4 lines, cranked a while, got fuel @ #4 tightened, cranked some more got fuel @ #1, tightened, cranked a bit it fired, shut it down tightened #3 and fired her up. As when changing injectors it ran rough for about 15 - 20 seconds then all was well.



This site never ceases to amaze me with the knowledge it contains, after posting more than 2300 times I'm still learning and sharing the wealth of information.



This particular situation never happened to me, or anyone that I know with a Cummins, so it was new and scary to me.



thanks again!

 

[Joe Mc]

Oh almost forgot . . . A lesson learned here (and $65 for a tow home was cheap versus what it could have been) - make sure to keep a 3/4" wrench in the truck "for just such occasions". :-laf

 

[Mishkaya]

Glad to hear that it was as simple as that; I remember well the state of panic I was in for a few minutes the first time (and only) that it happened to me. I then remembered reading about such a thing in the past so I thought I would give it a shot, and that was also indeed my problem.

mishkaya

 

[Huff N Puff]

Don't let of the throttle suddenly

You will find,if you let of the throttle gently, it wont gulp air. You can also drop it into neutral after you decel give it part throttle to keep it from gulping air.