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P1689 - 1999 Ram 2500 - Idle @ 800rpm & start easy- touch pedal rpm jumps to 1400????

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Found this trouble a couple of places but no for sure solutions.  Mileage on truck is 87,453 and is stock all the way.  No trouble in the past.  Just Oil, filters, tires and battery.  Bought new in late 1999. Old and retired but I like my truck and need to fix it soon so help.  Replaced the lift pump and filter, checked the APPS voltages and are OK,  engine starts quick and idles perfectly.  Touch the accelerator pedal and rpm jumps to approx. 1400 and that is all.  Foot off pedal, goes back to idle.  MIL (engine light) on & all other lights work normal.  Wait to start on and times out as usual.  Code P1689 is all that reads.  HELP PLEASE.

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  • Author

Don't know anyone that even owns a diesel truck.  Live out in the sticks and don't get around much.  Especially now that that dumb truck is giving me a fit.  Thanks for the help.

  • Owner
10 hours ago, balesray said:

Don't know anyone that even owns a diesel truck.  Live out in the sticks and don't get around much.  Especially now that that dumb truck is giving me a fit.  Thanks for the help.

 

Like I said ask the members here I'm sure someone would be nice enough to help you out. If I lived closer I'd be on your door step to help out. I've done plenty of VP44 swaps. Like my last two job I've had @hex0rz show up at my place to have injectors swapped out and then gone over to Walla Walla, WA to @Taz place to do a clutch for him. So like I said ask around I'm sure someone would help you out.

  • Author

Trying to bleed the air out of the lines now.  Which one's and how many need to be bleed.  Batteries ran down so on charge cycle now.  Anything special that need to be done beside bleed the air? 

I  do every other one.  Just crank crank and crank some more.

  • Author

GUESS WHAT!!!!   Charged the batteries a couple hours each disconnected, hooked them back, engine cranked over half dozen time and kicked right off.  GUESS AGAIN!!!! Truck is now running like it should so problem was the VP44 and thank goodness.  Think I'll get a job working on diesel trucks now. 

Thanks ever so much for the info you and everyone else has provided cause I really needed it..

It is still very satisfying to hear that Cummins fire off after a repair. Always makes me think I can do anything. Felt that way the other day when I changed my fuel filters and sucked a big air bubble in there. Glad you got your problem fixed. 

  • Author

Read somewhere that oil should be added to this new diesel fuel.  Any info on this and if so what kind of oil should be used.

1 hour ago, balesray said:

Read somewhere that oil should be added to this new diesel fuel.  Any info on this and if so what kind of oil should be used.

 

  • Author

Any idea the ratio of oil to fuel???

1 oz to 1 gallon.  

Nothing exact to the science to it really.

  • Author

Don't know if anyone wants to know just how much was spent, not counting my time, on this project but could possible save some time and expense so here goes.  I took the route of do the easiest and cheapest first.  Fuel Filter ($13.46),  Fuel pump ($98.68), APPS which was returned and restock fee was $9.80 plus $3.02 shipping, ECM also returned after restock fee of $167.25 plus $12.00 shipping, VP44 cost and used $975.  Truck had a code of P1689 and the trouble was that VP44 and nothing else. 

I thank everyone for their help and could not have done this without it.  THANKS

Also bought a code reader (Bosch) that cost $109.  Anyone want to kick in and help pay for all these mistakes????