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Old 07-21-2009, 17:13   #1 (permalink)
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3.0l ranger

ive got a ranger 3.0,had a misfire so i took it to a dealer and thye told me that i had burnt valves and had to do the cyl heads.pulled the heads and found absolutely nothing wrong,ground the valves ect and put them back on,every now and then i still have a misfire and rough running.ive changed the coil pack,plugs,crank sensor,leads and everything that i coul think of or have been told to do.any ideas?
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Old 07-24-2009, 16:37   #2 (permalink)
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Re: 3.0l ranger

Curious, but have you tried a higher octane fuel to see if that helps the misfire? Sometimes it's beneficial to run +2 octane on a higher mileage engine. As I'm assuming you're running 85 or 87 octane (regular), pop in a few gallons of 91 to even it out to around 89 octane and see how it runs after 50-100miles.
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