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Old November 14th, 2013, 04:11 PM   #21
big86inthestixx
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That computer also has the ability to go into a 3cyl high idle mode or just a high idle (1000-1200) when iat and ect temps are below 40 degrees.
So being that u have heard high idle, and 3 cyl high idle, maybe your computer is takin a crap on ya. .
??

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Old November 14th, 2013, 10:55 PM   #22
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Update: pulled valve cover to check valve train noise...started motor and proceeded to fill it with coolant from the open heater core feed. DOH! Was planning on changing the oil soon....just not THIS soon. Lol.
Soooooooo......on my way home from Walmart with my three gallons of oil, I was surfing the net to see if the computer on the vp44 could be replaced, and ran across a diagnostic write up. There was a section that described my problems almost exactly, which were attributed to the vp44 computer going bad. So that's hopefully the problem.
After I changed the oil...decided I should check valve lash clearances...they seem to be pretty tight. Will be adjusting those Saturday.
Will let you guys know if and when I get it fixed.
Orrrrrrrrrr.....if anyone knows anyone who could fix the computer for me, that would be great :-)
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Old November 15th, 2013, 02:46 AM   #23
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You can actually but the computer separate from the pump? I didn't know that. Learn something new every day.
Mine just went bad this summer and I ended up replacing the whole pump.
2200.00 of awesomeness!

Good luck!

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Old November 15th, 2013, 08:29 AM   #24
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Idk for sure if you can buy the computer.....i do know it can be repaired....
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Old November 18th, 2013, 02:43 PM   #25
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When you put the injectors and crossover tubes in how did you put them in exactly. It sounds like your crossover tubes aren't sealed correctly causing a rough idle.
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Old November 18th, 2013, 10:09 PM   #26
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With all the different posts I've made....i should probably clear everything up...

Idles rough when first started. Once I "clear it out", it idles and runs great, until....it gets warm(operating temp'ish), then the rough idle and smoking start.
Like I posted earlier...all signs of rough idle and smoke point to that computer. I just don't know how it could have possibly gone bad just from sitting!

Last edited by unclemyke; November 19th, 2013 at 02:38 PM.
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Old November 19th, 2013, 10:56 AM   #27
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Just beware.....everyone likes to blame any and every problem with these motors on the vp 44 pump.....i had a reputable diesel shop swear up and down two different occasions that my pump was bad and causing my issue...i ignored them both times and good thing i did as they were wrong both times.

How much fuel pressure do you have?
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Old November 19th, 2013, 11:23 AM   #28
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Not sure on fuel pressure.
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Old November 19th, 2013, 03:02 PM   #29
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That is step number one with these trucks....you do not drive them without monitoring fuel pressure lol
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Old November 19th, 2013, 03:37 PM   #30
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Quote:
Originally Posted by 974x4Taco View Post
That is step number one with these trucks....you do not drive them without monitoring fuel pressure lol
This is absolutely necessary!

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Old November 19th, 2013, 06:24 PM   #31
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What do you guys suggest I do that with?
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Old November 19th, 2013, 06:37 PM   #32
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You can buy a fuel pressure gauge most anywhere for not much....you need to plumb it into the supply side either right at or just before the injection pump. The lift pump which is responsible for moving fuel from the tank to the injection pump is known to be a junk setup on these trucks....hence the popularity of the fass/airdog setups

Fuel pressure is important because the injection pump uses fuel for internal lubrication. Without good fuel pressure the pump will burn up fast. Dodge spec is like 5psi.....10-15psi is better.
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Old November 19th, 2013, 07:01 PM   #33
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Quote:
Originally Posted by 974x4Taco View Post
You can buy a fuel pressure gauge most anywhere for not much....you need to plumb it into the supply side either right at or just before the injection pump. The lift pump which is responsible for moving fuel from the tank to the injection pump is known to be a junk setup on these trucks....hence the popularity of the fass/airdog setups

Fuel pressure is important because the injection pump uses fuel for internal lubrication. Without good fuel pressure the pump will burn up fast. Dodge spec is like 5psi.....10-15psi is better.
IF you put the connection right at the injection pump, be sure to buy a fuel pressure snubber. It keeps the injection pump lil pressure spikes from ruining your new qauge.
Took 3 guages for me to figure that out.
:banghead:

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Old November 19th, 2013, 07:52 PM   #34
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Oh yeah.....should probably mention I have a FASS 150.

Oh yeah.....again.....I just resurrected an older thread on the Cummins forum from a guy with almost the exact same problem without the smoke, after installing new injectors.
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Old November 22nd, 2013, 08:19 AM   #35
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Maybe a little preemptive, but...got the valves adjusted, and killed the batteries in the process(left the key on[maybe reset the computer?]), and viola! It's running great so far. Beat on it last night, and this morning and it still seems ok.
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Old November 22nd, 2013, 08:21 AM   #36
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Excellent!
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