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2.5L ('98-'01) 98 Ford Ranger 2.5L running rough and no power.


Doomgaze

10+ Year Member

Joined
Jan 1, 2012
Messages
15
Points
1,601
City
Deep South
State - Country
TX - USA
Vehicle Year
1998
Vehicle
Ford Ranger
Drive
2WD
Engine
2.5 (4 Cylinder)
Transmission
Manual
I was coming home from work the other day and all of a sudden began to lose power. I pulled over and turned the truck off and check fluids etc. Had a scan done at O'Reilly's: P0171: System too Lean (Bank )
P1506: -
P0302 Cylinder 2 Misfire Detected
P0303 Cylinder 3 Misfire Detected

I've replaced the coil packs and the fuel filter so far but no resolution. I had to work all week/weekend so I had my dad check the truck out. He checked the fuel pump and the timing and saw no issue. He didn't check the spark plugs/wires besides the #1. Anyone have any idea aside from those thing that I should check at this point? I know there are many things it could be but just ideas for trouble shooting.

Thank you for your time.
 
Last edited:
Can always try moving the #2 or #3 wire to #1 or 4 to see if the misfire follows the wire. Obviously the other end of the wire needs to be in the right plug on the coil pack..

But considering it's misfiring on neighboring cylinders & also showing a lean condition id probably be taking a look at the intake gaskets.
 
With those symptoms and codes I would suspect the pre cat oxygen sensor before spending a bunch of money on other stuff... if it's old change it, if not check the heater circuit and fuse supplying power to it, unless there's a bad vacuum leak somewhere...
 
Can always try moving the #2 or #3 wire to #1 or 4 to see if the misfire follows the wire. Obviously the other end of the wire needs to be in the right plug on the coil pack..

But considering it's misfiring on neighboring cylinders & also showing a lean condition id probably be taking a look at the intake gaskets.
Yeah, I will be doing that. I have new spark plugs and wires and fuel injectors to replace on the truck this weekend. So, definitely will take a look. The gasket isn't very old though to be honest but will definitely look and replace it after I put in new fuel injectors. Will update after I do the job if the issue was resolved.
 
With those symptoms and codes I would suspect the pre cat oxygen sensor before spending a bunch of money on other stuff... if it's old change it, if not check the heater circuit and fuse supplying power to it, unless there's a bad vacuum leak somewhere...
I will take a look at those and yeah I was thinking there could be a vacuum leak somewhere which will be fine to find...
 

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