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Old 04-16-2018, 12:15 PM   #1
domiprovine
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Default 1998 Ford Ranger 4.0 4x4 Manual

My ranger has been having some issues lately. During heavy braking it will stall but it seems to only do it when my truck has under a quarter of a tank. Also my truck is fouling out spark plugs really fast, sometimes in only about 500 miles. Any ideas?
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Old 04-16-2018, 12:30 PM   #2
RonD
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You could have leaking hose in gas tank, when it is exposed to air, air is sucked in and engine starts to stall, so fuel level related.

What do the old spark plug tips look like?

Go here: https://www.carid.com/autolite/info/installation.html
Click on Troubleshooting to see spark plug tips

How many miles on the vehicle?
O2 sensors last 100-125k miles, as they get older engine will run Rich

Do all the spark plugs foul or just specific cylinders?

The 4.0l OHV does "eat" spark plugs, but thats a bit fast, lol
Motorcraft seem to last the longest, then Autolite
They do use a large gap so make sure to set it at .054

Last edited by RonD; 04-16-2018 at 12:39 PM.
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