Truck starts great idles at 800 rpm push accelerator goes to 1300 rpm

[Takendad]

I just bought a 1999 Dodge 3500 4x4 dually 5.9 Cummins 24 valve from my family. It was my dads prior to his death. Truck has been sitting for approximately 12 years. Got it home changed all fluids and filters. Installed two new batteries and cleaned all terminals. Truck has 112,000 miles and is all stock as far as I can tell. Started truck and it fired right over on third crank and idles smooth, when you press the accelerator it immediately goes to 1300 rpm and there is no in between or nothing higher than 1300 rpm. Has a fault code of P1689 which is no communication between the ecm and fuel pump. Checked all connections and didn’t find any corroded. My questions are 1.) If it was truly a P1689 would the truck even start? (I’m no diesel mechanic ) and 2.) could it be a TPS and not show a P0122 code? As far as I know when dad parked it all was running fine except it had a very minor transmission drip ( which will be next step). I have read almost all the posts and was unable to locate any threads close to this. Thanks in advance for any and all help!!

 

[Takendad]

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[Joninva]

I'm no expert, but since nobody else replied, here's my 2 cents. I would look at the TPS. Hook it to a scanner and check voltage. I don't know the specs for correct voltage, but it should go up gradually, no spikes. Clearing the trouble codes might help the problem.
One thing I did on my 92 that's worth a try. It was dropping in and out of OD at odd times. I removed the TPS, soaked it in WD40, worked it back and forth, and put it back on. The truck shifted like it should after that. But after about a month, it acted up again. I did this several times, but finally ended up replacing the tps.

 

[Takendad]

Joninva Thank You for the reply, I will try that today. At this point your 2 cents is a dollar to me. Thanks again!!

 

[Takendad]

Joninva Thank You, I will try this today. Right now your 2 cents is a dollar to me. Thanks again!!

 

[crabman]

This link below has some very good tests and diagnostic information that may be helpful to you.
https://www.bluechipdiesel.com

 

[Takendad]

Thanks crabman for the link.

 

[crabman]

Clean the battery connections, locate clean all the grounds in engine compartment. Grounds are very important in the newer vehicles as most of the sensors use very low voltage for their operation. Check the wiring for rodent damage also since the vehicle was sitting for such a extended period of time.

 

[Takendad]

Clean the battery connections, locate clean all the grounds in engine compartment. Grounds are very important in the newer vehicles as most of the sensors use very low voltage for their operation. Check the wiring for rodent damage also since the vehicle was sitting for such a extended period of time.

Cleaned all terminals ( positive and negative) checked and cleaned all other grounds, cleaned all connections in fuse box under hood, checked all fuses with multimeter. Hopefully if rain stops I will be checking all wires for any rodent damage, checking APPS and will start on the diagnostics in the link provided. Thanks so much!! This forum is helping me get the truck going again in my dads memory.

 

[HHhuntitall]

I'd say you need to lease/borrow a scan tool and diagnose it a little further.... sounds to me more like a crankshaft or camshaft position sensor failure....