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Intermittent electrical issue, Please read CAREFULLY.


Ranger4x4.0

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Poplar Bluff, Mo
Vehicle Year
1998
Make / Model
Ford
Engine Type
4.0 V6
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4.0 OHV
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Manual
2WD / 4WD
4WD
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God is great, beer is good, and rangers are awesome!
The crank sensor controls spark I thing, correct me if I'm wrong, but when the plastic sensor heats up, it expands and loses signal from the magnet multiple times per minute, and that's when the hard jerk occurs. Once in a while it will shake the magnet thingy back in place so to say and will do fine for a month or more until it decides to be a dummy again. I think this sensor also controls the reading of the rpm guage, which means that when it loses signal, the guage will go all the way down to almost 0, even when the engine is actually still going alot faster even when it's not getting power, for example, if your sensor was good and you turned off the engine while going down the highway, the engine has no spark or fuel, yet the sensor will still read how fast the crankshaft is going so your guage will still be at, say 5000 rims if your racing a mustang or something of that nature but I don't think turning off your engine while racing would receive a winning outcome :D. Hope info helps :D
 
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Rock Auto 5% Discount Code: 70D65189E6D8FF: January 5th, 2022

billy14870

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1998
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Ford
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4.0 v6
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Manual
Update

I replaced the PCM relay in the relay box under the hood a few months back. I also replaced the crank shaft position sensor a few months ago. So both of these are ruled out....


A friend of mine said that he had a similar problem that involved his trailer harness lol any possibility there?

Thanks for the help.
 


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