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Chris (aka- Moose)
Chris (aka- Moose), Ford Technician
Category: Ford
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Experience:  16 years experience with Ford.
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Ford Explorer Limited ford explorer 4.6 v-8 have random misfire

Resolved Question:

ford explorer 4.6 v-8 have random misfire under light load in high gear . when it downshifts its usually clears out but sometimes won't wind out instead rpms stall out in 3500 to4800 rpm range kinda pops and bucks then clears out . finally did it bad enough to light up check engine light and stay on , local o'reilly's loan code reader shows a p0300 random misfire that's all . think it's a coil pack but don't know which one.
Submitted: 3 years ago.
Category: Ford
Expert:  Chris (aka- Moose) replied 3 years ago.

Hello, I'm Chris.
I will do my best to answer your question fast and accurate using the info you have provided. Thanks for visiting Just Answer.

 

Just based on this one code there is a few more diagnostics which need to be performed. Your concern does fit that of a coil or plug needing to be replaced but the fact the random misfire code came up this means that its a misfire on multiple cylinders, so its not just one coil or plug. If your at or near the 100k tuneup like above 70k I recommend all new motorcraft spark plugs to start. if it continues then you need to use a scan tool and watch the camshaft and crankshaft speed sensors to see if they show a glitch causing these misfires. next you need to monitor the fuel pressure. Then you would need to check for a dirty MAF sensor or clogged EGR valve.

 

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Chris (aka- Moose), Ford Technician
Category: Ford
Satisfied Customers: 32846
Experience: 16 years experience with Ford.
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