all 6 sparks auto-backed out - Ranger-Forums - The Ultimate Ford Ranger Resource


2.9L & 3.0L V6 Tech General discussion of 2.9L and 3.0L V6 Ford Ranger engines.

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Old 12-18-2011
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all 6 sparks auto-backed out

long story real short...truck used to bog real bad when wheeling on after a long sit in the rain. got fed up and starting pulling pieces off to inspect, seal and dry. go to my plugs and all 6 were so loose I could walk them out by hands.

I torque them down with a torque wrench last time I did a complete change, so what in the world would cause all of them to back out to the point where I could twist em out with a cool block? I thought it was strange.

well needless to say I replaced them all, and all the wires as well. 180,000 on the stockk motorcrafts and she runs 2X as good, and doesnt bog a bit.
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Old 12-18-2011
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That is very strange... no damage to the threads in the head? You're lucky you didn't blow one out!
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Old 12-18-2011
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^x2
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Old 12-18-2011
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no damage whatsoever, They were still sealed up good enough to the point that I didnt notice any immediate loss of compression till outside air and water got in and screwed up the ratios.

also they were washer-less plugs. which makes no sense to me. they are tapered at the end but every plug ive ever seen from big to small has a washer to prevent just this. so im totally at a loss as to what would back all my plugs out by 1/2 to a full turn
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Old 12-18-2011
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What is the part number printed on the old plugs ?
And not all plugs use a washer , just a tapered seat.AC/Delco comes to mind.
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Old 12-18-2011
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I tossed the old plugs, truck runs so rich right now due to broken EGR that they were black and I just got new plugs all together. and I wanna say the old plugs were champion brand..? new ones are motorcraft
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Old 12-18-2011
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I think that was your problem, you had champions in there.
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