5.9 V8 Not Making Power

DodgeRamFan1999

Junior Member
Joined
Oct 11, 2021
Posts
1
Reaction score
0
Location
Iowa
Ram Year
1998
Engine
5.9L Magnum
I have a 99' 1500 with a 98' 5.9 v8, It start up no problem but when i start driving it feels so sluggish especially going up any hill it struggles. At around 2-3k RPM it wont pick up any speed just climb in RPM and when i let off the truck kind of jerks a little bit. Any help would be appreciated I've just started learning how to work on vehicles so any advice and help is appreciated.
 

dapepper9

Senior Member
Joined
Feb 7, 2013
Posts
5,836
Reaction score
2,185
Location
Iowa/Nebraska Border
Ram Year
2001
Engine
5.9L V8
Unplug and remove the upstream oxygen sensor. It may be rusted and a bit difficult seeing that you're in Iowa (also from Iowa) but if you do this and you notice that it seems to fix the problem significantly, you may have a plugged catalytic converter. Not at all uncommon on these old things. It's a solid place to start. In addition to that, check the sticky for the plenum fix and look into doing a tune-up (plugs, wires, cap, rotor and a clean air filter)
 

2012RAM1500RT

Senior Member
Supporting Member
TOTM Winner
Joined
Dec 8, 2020
Posts
1,454
Reaction score
2,420
Location
NC
Ram Year
2012
Engine
345 HEMI
Unplug and remove the upstream oxygen sensor. It may be rusted and a bit difficult seeing that you're in Iowa (also from Iowa) but if you do this and you notice that it seems to fix the problem significantly, you may have a plugged catalytic converter. Not at all uncommon on these old things. It's a solid place to start. In addition to that, check the sticky for the plenum fix and look into doing a tune-up (plugs, wires, cap, rotor and a clean air filter)
Ditto on the catalytic converter.
 

Todd Rusch

Junior Member
Joined
Apr 14, 2021
Posts
3
Reaction score
1
Location
Iowa
Ram Year
1997
Engine
Magnum 5.2L
Unplug and remove the upstream oxygen sensor. It may be rusted and a bit difficult seeing that you're in Iowa (also from Iowa) but if you do this and you notice that it seems to fix the problem significantly, you may have a plugged catalytic converter. Not at all uncommon on these old things. It's a solid place to start. In addition to that, check the sticky for the plenum fix and look into doing a tune-up (plugs, wires, cap, rotor and a clean air filter)
Yeah when I have time this weekend definitely going to check the cats that's what others were suggesting
 

RodeoRam

Senior Member
Military
Joined
Sep 11, 2018
Posts
361
Reaction score
441
Location
North Carolina
Ram Year
2018
Engine
Hemi 5.7
Could be transmission overheating and slipping. That's the way mine acted before I had to rebuild the transmission both times. The fluid was at the right level, but the transmission temp light came on, and I started losing gears until all I had left was 1, 2, & 3 before I parked it and called a rollback.
 
Top