spark plug gap
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spark plug gap
I rcently purchased a 92 F150 with a 351. The underhood emissions sticker has been painted over. The owner's manual says to refer to the emissions sticker for plug gap. Hence my problem. Can anyone help.
Thanks, Gunnyvon.
Thanks, Gunnyvon.
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Joined: Mar 2003
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Gunnyvon,
I have a 92, with the 302, and here is what I have found:
Chiltons manual: .044", (book also says go with sticker under hood.)
Under hood sticker: .052" - .056".
I put in NGK UR45's with a gap of .054", and the truck seems to run just fine.
Later,
Eric.
I have a 92, with the 302, and here is what I have found:
Chiltons manual: .044", (book also says go with sticker under hood.)
Under hood sticker: .052" - .056".
I put in NGK UR45's with a gap of .054", and the truck seems to run just fine.
Later,
Eric.
Posting Guru
Joined: Apr 2003
Posts: 2,123
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From: WA
My feeler gauge only goes up to .40, and I can't find any that go much bigger, where do you guys get yours at?
The plugs I get are pregapped so it's usually not a problem, but still I'd like to atleast have something that goes to the gap I need.
The plugs I get are pregapped so it's usually not a problem, but still I'd like to atleast have something that goes to the gap I need.
Post Fiend
Joined: Jun 2001
Posts: 5,228
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From: Running Springs CA
Most plugs for our engines are pregapped to .044 which is in many cases wrong. Instead of a feeler gauge, I use a spark plug gapping tool and gauge, cheap and available at any auto parts store.
Incorrect plug gaps in Chilton manuals has been a continuing problem. By '74 Econoline had Duraspark I and needed a wide gap, but the sticker was on the valve cover right next to the filler cap and covered with dirt. Plugs were pre-gapped at .032 in those days and Chilton agreed. That van was almost impossible to start until I discovered the correct .056 gap.
Jim
Incorrect plug gaps in Chilton manuals has been a continuing problem. By '74 Econoline had Duraspark I and needed a wide gap, but the sticker was on the valve cover right next to the filler cap and covered with dirt. Plugs were pre-gapped at .032 in those days and Chilton agreed. That van was almost impossible to start until I discovered the correct .056 gap.
Jim
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Thanks guys, I'm going with .052-.056. I found this on a co-worker's '97 F-150. It also has a 351. Differant plugs though.
Thanks again, Gunnyvon
Thanks again, Gunnyvon
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