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4.0L OHV & SOHC V6 Tech General discussion of 4.0L OHV and SOHC V6 Ford Ranger engines.

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Old 05-01-2011
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Spark Plug HELP

I'm swapping my plugs out right now, and the ones that I just pulled (Bosch Platinum +2) are quite a bit shorter than the ones I'm replacing them with (Autolite #APP5144)!
Everywhere that I've checked is saying that the 5144 is the correct plug for my '04 4.0 SOHC, but I certainly don't want things smashing into each other!
Thanks
MikeR
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Old 05-01-2011
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It sounds like the difference between 1/2" reach plugs vs. 3/4" reach plugs. Someone probably mistakenly installed the 1/2" Bosch plugs in your engine.

Last edited by V8 Level II; 05-01-2011 at 12:26 PM.
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Old 05-01-2011
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The Bosch ones are wrong. I installed APP5144 plugs in my truck and nothing has gone wrong. Before I put them in I compared them with the OE ones that I took out, and they were exactly the same.
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Old 05-01-2011
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Thanks guys-appreciate the confirmation
MikeR
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Old 05-01-2011
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Always stand a plug on it's end. As long as the metal ( the seat to the bottom of the plug is the same it will work. The ceramic insulator only matters where heat dissipation maters. Multi-ground electrode plugs don't give you any advantage vs single electrode. Stick with the Autolite or Motorcraft and keep the OE recommended heat range.
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