I re gapped them all to .054.
Another question...do I have to replace the UIM
gaskets after I pull it to change the plugs?
BTW....if i were head of engineering at Ford and and engineer gave me an engine design where you had to pull the intake manifold to change spark plugs...I wouldn't only not approve the design...I'd FIRE the SOB!
I set mine to min specified gap, as the gap is always opening up with time, so the spark gap will stay in spec longer & having the gap on the min side will help a little with cold winter starts & it slightly advances the spark which will help some too.
I also butter the spark plug threads with a light coating of high temp nickle anti-sieze compound, to prevent them siezing in place, then torque to the Min side of spec, to allow for the anti-sieze lube effect.
I also butter the outside plug insulator & inside both plug wire boots with light coating of DowCorning or GE silicone grease, to prevent flashover on those wet dewy, or damp, rainy day starts.
I'd have the designers work on the assy line & at the Dealers, turning wrenches for at least 6 months each, before they'ed ever set their buns down at a CAD station to design something for me!!!!!.
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99 Ranger XLT 4dr 4.0L 5spd Auto
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Last edited by pawpaw; 07-30-2012 at 08:50 PM.