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Tractor Transporting Discussion Forum

1998 Dodge Cummins 12 valve

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RHD Joe

02-19-2013 10:35:26




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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




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WayneB

02-27-2013 12:40:40




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 Re: 1998 Dodge Cummins 12 valve in reply to RHD Joe, 02-19-2013 10:35:26  
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.



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puln70

02-21-2013 16:24:52




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 Re: 1998 Dodge Cummins 12 valve in reply to RHD Joe, 02-19-2013 10:35:26  
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.



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RHD Joe

02-21-2013 12:09:17




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 Re: 1998 Dodge Cummins 12 valve in reply to RHD Joe, 02-19-2013 10:35:26  
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.



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jd plowboy

02-21-2013 13:37:15




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 Re: 1998 Dodge Cummins 12 valve in reply to RHD Joe, 02-21-2013 12:09:17  
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



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jd plowboy

02-21-2013 13:27:36




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 Re: 1998 Dodge Cummins 12 valve in reply to RHD Joe, 02-21-2013 12:09:17  
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.



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farmer boy

02-21-2013 15:20:22




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 Re: 1998 Dodge Cummins 12 valve in reply to jd plowboy, 02-21-2013 13:27:36  
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.



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jd plowboy

02-20-2013 15:58:08




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 Re: 1998 Dodge Cummins 12 valve in reply to RHD Joe, 02-19-2013 10:35:26  
i thought the 98 was a 24 valve engine not a 12 valve



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farmer boy

02-20-2013 20:27:53




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 Re: 1998 Dodge Cummins 12 valve in reply to jd plowboy, 02-20-2013 15:58:08  
Switched in 98.5



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jd plowboy

02-21-2013 03:13:31




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 Re: 1998 Dodge Cummins 12 valve in reply to farmer boy, 02-20-2013 20:27:53  
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



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sdc eastern ia

02-20-2013 07:16:10




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 Re: 1998 Dodge Cummins 12 valve in reply to RHD Joe, 02-19-2013 10:35:26  
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



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larryanderson

02-20-2013 00:46:50




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 Re: 1998 Dodge Cummins 12 valve in reply to RHD Joe, 02-19-2013 10:35:26  
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.



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scotc

02-20-2013 00:08:41




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 Re: 1998 Dodge Cummins 12 valve in reply to RHD Joe, 02-19-2013 10:35:26  
I'd check fuel pressure first. Between the filter and IP.



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43 m

02-19-2013 16:30:50




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 Re: 1998 Dodge Cummins 12 valve in reply to RHD Joe, 02-19-2013 10:35:26  
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.



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Dieseltech

02-19-2013 13:53:47




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 Re: 1998 Dodge Cummins 12 valve in reply to RHD Joe, 02-19-2013 10:35:26  
May want to check pump housing return pressure control bolt, if it opens too early will have low gallery pressure causing trouble you describe.



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bobs old iron

02-19-2013 10:47:59




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 Re: 1998 Dodge Cummins 12 valve in reply to RHD Joe, 02-19-2013 10:35:26  
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..



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