12 valve won't turn off - Competition Diesel.Com

RD TRCTR · 04-20-2017, 06:42 AM

Tried using the search function to no avail.

When I got home yesterday I was not able to turn the truck off with the key. The engine stays running when the key is turned to the off position. When the key is turned back to on, the engine idle rpm will decrease a bit and then go back to the typical idle speed.

The only way that I have found to turn the truck off is to stall it with a side step of the clutch.

It's a 1998 12 valve with the NV4500. No issues were present or noticed prior to getting home.

jasonc · 04-20-2017, 06:59 AM

Check over the shut off solenoid the problems there. Its spring loaded to turn off when it looses power.

95cummins5.9 · 04-20-2017, 07:10 AM

The rubber boot on the shut off solenoid probably deteriorated and is stuck holding the return spring. Easy fix.

CorneliusRox · 04-20-2017, 08:26 AM

Quote:

Originally Posted by 95cummins5.9

The rubber boot on the shut off solenoid probably deteriorated and is stuck holding the return spring. Easy fix.

This is exactly what happened to me with the same symptoms.
It happened ~9 years ago, and I had just some basic tools on the side of the road, I removed the shut off solenoid, ripped the boot off, cleaned everything with a rag I had, and put it back together.
When I get done with my trip, I took it apart and greased it. Since then, it hasn't had a boot, and it's never given me a problem. And I live in a pretty corrosive area (UP at that time, then Chicago, then Colorado (not bad corrosion wise), currently Minnesota).

I'd bet money that's your problem.

Also, when you take the shut off solenoid off, make sure you don't lose the woodruff key on the ppump shaft. I've done it and it sucks.

*Snedge* · 04-20-2017, 09:34 AM

Just leave it run, they sound pretty nice.

***wideopen*** · 04-20-2017, 10:17 AM

Quote:

Originally Posted by Snedge

Just leave it run, they sound pretty nice.

You'll save money on Starters also.

RockinRam96 · 04-20-2017, 11:15 AM

Quote:

Originally Posted by wideopen

You'll save money on Starters also.

But it will always be warm... No cold start videos.

***wideopen*** · 04-20-2017, 11:50 AM

Quote:

Originally Posted by RockinRam96

But it will always be warm... No cold start videos.

Some have to suffer for others to be entertained.

*Snedge* · 04-20-2017, 01:05 PM

Quote:

Originally Posted by wideopen

Some have to suffer for others to be entertained.

This is so true.

04-20-2017, 06:42 AM	#1
RD TRCTR Name: RD TRCTR Title: Diesels, Burn Outs & Tits Status: Not Here Join Date: Oct 2012 Location: MI Member`s Gallery Posts: 652	12 valve won't turn off Tried using the search function to no avail. When I got home yesterday I was not able to turn the truck off with the key. The engine stays running when the key is turned to the off position. When the key is turned back to on, the engine idle rpm will decrease a bit and then go back to the typical idle speed. The only way that I have found to turn the truck off is to stall it with a side step of the clutch. It's a 1998 12 valve with the NV4500. No issues were present or noticed prior to getting home. __________________ 2018 3500 G56 unicorn 2006 2500

04-20-2017, 06:59 AM	#2
jasonc Name: jasonc Title: Too Much Time Status: Not Here Join Date: Nov 2009 Member`s Gallery Posts: 4,412	Check over the shut off solenoid the problems there. Its spring loaded to turn off when it looses power.

04-20-2017, 07:10 AM	#3
95cummins5.9 Name: 95cummins5.9 Title: Old man *** gossiper Status: Not Here Join Date: Jun 2012 Location: U.S.A Member`s Gallery Posts:** 4,720	The rubber boot on the shut off solenoid probably deteriorated and is stuck holding the return spring. Easy fix.

04-20-2017, 09:34 AM	#5
Snedge Name: Snedge Title: Comp Diesel Sponsor Status: Not Here Join Date: Sep 2006 Location: Western Pa. Member`s Gallery Posts: 18,860	Just leave it run, they sound pretty nice.