(800) 853-2651
SHOP NOW

1998 Dodge Cummins 12 valve

A

Anonymous-0

Well-known Member
Dodge 3/4 ton PU has 350000 miles suddenly doesn"t want to rev over about 2000rpm,sputters. Starts and runs ok up to that point but not much power. Local auto shop that does all our ragular service changed fuel filter but no real improvement. Before I spend a lot of money on an older truck with rust and dent issues, would some of you with Cummins experience have some advice? Thanks
 
R.I.P.,,lol 350k miles, not bad,, if you want to keep it with out spending a lot of money, thats up to you.. you could check the exshust system to make sure not getting pluged up/back pressure causing engine rpm's to stay at low speed... can also go to dodgetruck.com and see if any one there has answers also..
 
Have a diesel shop in the area do a fuel pressure test or you can add a fuel pressure gauge your self . It should read a steady 8 to 10psi at wide open throttle. Sounds like your lift pump is heading south. Get it checked SOON as if it is the problem it will take the pump on the cruise to, and the big money begins.
 
Dodge[12valve] like Ford[7.3] should have stayed with the proven motor minus all the computer technology .The lift pump is the weak link.Best get it fixed as it will cause extra pressure on injection pump.
 
Had a floater with a 6CTA in it that some jacka$$ thru Mini snickers bars in the fuel tank. The screen from the lift pump would plug constantly and the machine would act as you describe. Either screen plugged or lift pump going south. My 2 cents
 
i have a friend that my brother was looking at his 97 to buy and it has a 24 valve cummins in it and thats why i thought it was 96 or 97 when they changed. i had a 95 12 valve cummmins
 
Thanks for the helpful suggestions, guys. The weather is back up above zero again so we will get the truck back in the shop and check fuel pressure as a starting point. Most of you know I specified 12 valve because they switched to 24 mid year 1998. Thanks again and I'll post what is the diagnosis.
 
it might be something between the 3/4 ton and and the one ton duallys cause his is a 97 and has a 24 valve cummins in it.
 
i just talked with him and it does have a 24 valve in his 97 but it was changed to that before he bought it ten years ago but i know i saw 24 valve on the engine. not sure the reason why but it is in there. i had a 95 and got a 2005 cummins now. sorry for the confusion
 
The 6BT was replaced with the Cummins ISX in 98.5, and I don't think the two were ever produced at the same time. Most 1998 model trucks I've seen have 12V engines. It is possible to put the 24V heads on a 6bt engine with some modifications.
 
There's also a screen on the liftpump that you might want to clean.
You can go to Diesel Truck Resource for more help.It could of slipped time to along with a few other things.
 
Is there a sock or pickup screen in the fuel tank pickup?
I have a 12V in a Chevy, and mine had the same symptoms, dropped the tank, replaced the sock and back to running good.
 
You must log in or register to reply here.
Tractor Parts Tractor Manuals

We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today.

Copyright © 1997-2024 Yesterday's Tractor Co.

All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.

Yesterday's Tractors - Antique Tractor Headquarters
Website Accessibility Policy

Back
Top