Q: Q: Jeep shut off while driving.

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While I'm driving my Jeep will just shut off and take about 10 mins for it to crank back up. It may shut off again almost immediately after cranking it up. Then the next time it'll be ok for a little while only to shut off again while driving. What could this be. I replaced the fuel pump/filter and the (something) position sensor. What could be be causing my truck to shut off while driving? Thanks!!

My car has 170000 miles.
My car has an automatic transmission.

This may be a sign of a faulty ignition coil. Ignition coils are coated with a varnish-like insulation that becomes brittle over time after being stretched then contracted repeatedly The insulation develops small fractures that open when heated and close when cooled. When open, they allow shorting of coil windings and decrease or eliminate the coil’s ability to function. This type of temperature cycling happens because every time you shut the engine off, the fan stops running, the coolant stops flowing and the temperature under the hood rises. Every time you start the engine again the coolant flows, the fans turn on, and the temperature drops. When this heat dissipates and is absorbed under the hood, it is trapped causing this cycling effect. Components that contain heat sensitive materials include parts like coils, injectors, igniters, and some sensors. Any of these may be potentially subject to this same kind of heat problem which can be very difficult to trace. I would recommend having an expert from YourMechanic come to your location to take a look at your vehicle to properly diagnose your ignition system.

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