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Misfiring on cylinder three cylinder five and cylinder six


Joes86

New Member
Joined
Mar 2, 2025
Messages
2
City
Idaho
Vehicle Year
1986
Transmission
Manual
I misfiring on the second batch fire set of cylinders and I replaced every part I can think of on this 2.9 86 Ranger from the computer to the distributor and everything in between and I can’t find any broken wiring. Any help or suggestions would be great
 
Get a meter. Make sure you have 12v on the red wire that feeds all those injectors at the injector itself.

You can get a testlight to check for voltage, and you can also hook a small bulb across one of the offending injectors, and see if the bulb blinks on and off.
 
Get a meter. Make sure you have 12v on the red wire that feeds all those injectors at the injector itself.

You can get a testlight to check for voltage, and you can also hook a small bulb across one of the offending injectors, and see if the bulb blinks on and off.
I have already used a power probe to test it they stay at a constant 12v while the other set fluctuates as it should
 
I would back probe that bank injector wire at the computer. If the test probe does not blink, it has to be the computer. If it does blink it has to be the wiring.
 

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