plug gap
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Junior User
Joined: Sep 2007
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plug gap
whats the plug on a 92 5.0 .45 and im haveing some rough idleing.i was told that i should put them at .35 and that would probably fix it. and there is a new tune up and wires are ran right and have everything else.
Elder User
Joined: Sep 2005
Posts: 841
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From: Orangeville, Ontario
Make sure the wires are routed correctly, crossfirings an issue on these trucks.
http://www.supermotors.net/vehicles/...media/470415_1
http://www.supermotors.net/vehicles/...media/470415_1
Senior User
Joined: Sep 2007
Posts: 212
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From: Arizona
I've never heard of gapping down a plug on the 5.0 to achieve what you want, especially that much. I would think that it wouldn't work, these engines like oem or close parts so motocraft or autolite wires and plugs etc. They also like oem specs like the gap of spark plugs. Plus crossfiring is an issue like roadvirus said.
Fleet Owner
Joined: Aug 2005
Posts: 23,667
Likes: 301
From: Easton,Ks
The gap of a plug determents how hi the voltage is the coil puts out.
If you have bad wires then yes this may stop the cross firing for a while but it will be back.
However the spark will not be as hot and if you are using oil the plugs may foul up on you and not fire that cylinder.
You will also have a problem with getting lean mixtures to burn.
Bottom line is it would be a bad idea.
If you have bad wires then yes this may stop the cross firing for a while but it will be back.
However the spark will not be as hot and if you are using oil the plugs may foul up on you and not fire that cylinder.
You will also have a problem with getting lean mixtures to burn.
Bottom line is it would be a bad idea.
Elder User
Joined: Jun 2006
Posts: 805
Likes: 3
Originally Posted by 92fordman
whats the plug on a 92 5.0 .45 and im haveing some rough idleing.i was told that i should put them at .35 and that would probably fix it. and there is a new tune up and wires are ran right and have everything else.
Set the gap per the sticker, set the base timing (remember to disconnect the spout and reconnect it when you're done). Make absolutely sure that when you route the wires to the 5678 side, that 5 and 6 stay between 7 and 8 as long as possible. Cross-firing will make a 92 5.0 run like crap (been there, done that) even with brand spankin new Motorcraft 8mm wires.
If all that fails to correct your rough idle, go get a vacuum gauge, and start checking for leaks. See my gallery for details.
