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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 02-23-2009
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Spark Plug Gap

What is the proper spark plug gap for a 2002 4.0 sohc. In the haynes manual it says to gap them .061 to .068. In the owners manual it says .052 to .056. I just want to make sure that i get them gaped right. And please dont tell me to search, Wild blue internet sucks, took me 10 min just to load this page. LOL thanks
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Old 02-24-2009
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Old 02-24-2009
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.054 nominal - owners manual ftw.

Last edited by Jp7; 02-28-2009 at 10:35 PM.
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Old 02-24-2009
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there is a white sticker under the hood of your truck that should have the gap recommendations... if you are replacing the plugs with double platinums, you shouldnt need to gap them and sometimes if you do gap a platinum, you will damage the plug.
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Old 02-24-2009
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Yeah the motorcraft plats come gapped at .055
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Old 02-24-2009
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Gap your plugs to .054

Dont take the pregapped route... I did and got some crazy crap as far as performance goes, skipping, jerking ect. .054 is the right gap.
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Old 02-24-2009
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Quote:
Originally Posted by ramrezz425 View Post
Dont take the pregapped route... I did and got some crazy crap as far as performance goes, skipping, jerking ect. .054 is the right gap.
you can check the gap on the plugs, just dont try to adjust it... if its way off, it was probably dropped anyway which means the plug is more than likely cracked...
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