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#1 |
Equal opportunity joke ofender
![]() Join Date: Oct 2011
Location: Eastern Shore of MD
Posts: 10,005
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5.9 cummings 12v question
guys
I have a 96 5.9 12 valve in a ferd work truck. Truck has sat since beginning of 2020 but ran and drove great when I set it up. It had been started and drove around the yard at least once a month since. I needed it the other day on a job a couple miles from the shop so I fired it up and away we went. Engine idles fine and revs up fine with no load but going thru the gears seems to lose all power and the most I could get out of it was about 25 mph which was still a struggle. Never once tried to shut off just has no power. Drove it back to the shop with same conditions happening. Any ideas what I should be looking for? would the fuel be going bad? Going over it smoked black smoke like crazy coming back was not as bad but you could definitely smell the raw fuel. Thanks Richard
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#2 |
Senior Member
![]() Join Date: Jan 2001
Location: Orem, Utah
Posts: 7,899
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Re: 5.9 cummings 12v question
How are the fuel filters? That would be the first place I would look. Also the water separator if it has one.
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I have sworn upon the altar of God, eternal hostility against every form of tyranny over the mind of man. - Thomas Jefferson |
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#3 |
Equal opportunity joke ofender
![]() Join Date: Oct 2011
Location: Eastern Shore of MD
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Re: 5.9 cummings 12v question
I just got a new fuel filter for it today and am going to try to get that changed out this week.
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Members I have met. Dually Jams, OlBlue60, ScottH, Tommyboy24, Dujobo, Warbucket, 2003 Silverado, Notsolo, my90k5, 6t727t2, Special-K ,Jack_71C10, tabarcus,72blazer_mud_bogger,pwdcougar,RSavage,EricSean,1Rippen6,invicta455,tennaragtop71,arks, Kendal,Bennett68C10, Perpendicular, Chainsawman, McGeesCustomMinis,ShortbedClayton,longblue72,6768chevylover,Tim71,Travisarmenta,Ol' Drippy,fleetmitch,georgieb51,Dave,bcnya2,Dadsburb https://paypal.me/6772GMtruckparts Most women like the strong, silent type… Fortunately for me, my wife prefers the out-of-shape, mouthy type. |
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#4 |
Registered User
Join Date: Aug 2020
Location: Salmon Arm BC
Posts: 167
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Re: 5.9 cummings 12v question
Check the air filter sounds like it is choking the engine. Fuel filter is probably fine if it was smoking hard and down on power it has fuel but not air.
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1970 C10 l/b 292/4spd Build: http://67-72chevytrucks.com/vboard/s...d.php?t=811062 |
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#5 |
Equal opportunity joke ofender
![]() Join Date: Oct 2011
Location: Eastern Shore of MD
Posts: 10,005
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Re: 5.9 cummings 12v question
Air filter was the 1st thing I checked because that was the 1st thing that came to mind with the smoke. Even took it for a drive without it and it does the same thing. No load everything is fine. 1st & 2nd gear is fine and will rev till the gov kicks in. Go to 3rd and it will not rev higher than 15-1800 rpms. Still have to change the fuel filter but been too damn hot to worry with it.
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Members I have met. Dually Jams, OlBlue60, ScottH, Tommyboy24, Dujobo, Warbucket, 2003 Silverado, Notsolo, my90k5, 6t727t2, Special-K ,Jack_71C10, tabarcus,72blazer_mud_bogger,pwdcougar,RSavage,EricSean,1Rippen6,invicta455,tennaragtop71,arks, Kendal,Bennett68C10, Perpendicular, Chainsawman, McGeesCustomMinis,ShortbedClayton,longblue72,6768chevylover,Tim71,Travisarmenta,Ol' Drippy,fleetmitch,georgieb51,Dave,bcnya2,Dadsburb https://paypal.me/6772GMtruckparts Most women like the strong, silent type… Fortunately for me, my wife prefers the out-of-shape, mouthy type. |
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#6 |
6>8 Plugless........
![]() Join Date: Sep 2007
Location: Prairie City, Ia
Posts: 17,140
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Re: 5.9 cummings 12v question
Did the fuel filter fix your problem? If not verify your fuel shut off solenoid is pulling the lever all the way up. If not you may not be getting full fueling.
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Ryan 1972 Chevy Longhorn K30 Cheyenne Super, 359 Inline 6 cylinder, Auto Trans, Tilt, Diesel Tach/Vach, Buckets, Rare Rear 4-link and air ride option Build Thread 1972 GMC Sierra Grande Longhorn 4x4 1972 Chevy Cheyenne Super K20 Long Step side tilt, tach, tow hooks, AC, 350 4 speed 1972 C10 Suburban Custom Deluxe 1969 Chevy milk truck 1971 Camaro RS 5.3 BTR STG3 Cam Super T10 1940 Ford 354 Hemi 46RH Ford 9" on air ride huge project Tired of spark plugs? Check this out. |
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#7 | |
Equal opportunity joke ofender
![]() Join Date: Oct 2011
Location: Eastern Shore of MD
Posts: 10,005
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Re: 5.9 cummings 12v question
Quote:
One thing that I am not sure if related, but the pedal will no longer return to idle on its own and I had to use my foot under the pedal to lift it back up. I put an external set of springs on the engine side to help bring it back to idle for now. It is just a yard truck so to speak at this point. Since I am not very familiar with the diesels I will grab a picture of what I did to see if you think that might have been my issue as well
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Members I have met. Dually Jams, OlBlue60, ScottH, Tommyboy24, Dujobo, Warbucket, 2003 Silverado, Notsolo, my90k5, 6t727t2, Special-K ,Jack_71C10, tabarcus,72blazer_mud_bogger,pwdcougar,RSavage,EricSean,1Rippen6,invicta455,tennaragtop71,arks, Kendal,Bennett68C10, Perpendicular, Chainsawman, McGeesCustomMinis,ShortbedClayton,longblue72,6768chevylover,Tim71,Travisarmenta,Ol' Drippy,fleetmitch,georgieb51,Dave,bcnya2,Dadsburb https://paypal.me/6772GMtruckparts Most women like the strong, silent type… Fortunately for me, my wife prefers the out-of-shape, mouthy type. |
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