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Old 05-14-2010, 08:51 AM
Shernius Shernius is offline
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Spark Plug gap and Torque Specs for 1999 5.4

Anybody know the torque specs and the gap for the spark plugs in a 1999 5.4 L code engine?
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Old 05-14-2010, 09:39 AM
frmboybuck frmboybuck is offline
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I gapped the plugs to .054 per my emissions label.....It specifies right on them. Torque should be 28 lbs dry. You will be good to go.
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Old 05-14-2010, 11:54 AM
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I gapped the plugs to .054 per my emissions label.....It specifies right on them. Torque should be 28 lbs dry. You will be good to go.

Unless there's been a change in torque specs between the 99 5.4 and the 97 ... my 97 5.4 calls for 12 to 14 ft. pounds torque.
Or to be more specific, 80.3 to 178 inch pounds .. page 303-01c-235
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Old 05-14-2010, 11:56 AM
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28 does sound high and I got 12-14 ft lbs from somebody else also. I would hate to pull out what little threads are there in the head.

Thanks
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Old 05-15-2010, 01:29 AM
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I've seen numbers like 12-14 on this forum. You do want to be careful. The early heads had an issue with spark plugs blowing out.

Later ones ( maybe after 2003) had an issue with spark plugs breaking apart when they were removed.

Fixed in 07, apparently.

From what I understand, this is for the 5.4 with 3 valves. Not an issue with the 2 valves as far as I know.
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Old 05-15-2010, 09:54 AM
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14 is a good middle number, it seems almost ever year and engine is a bit different I have seen as low as 11 and I think I have seen 17 on the high end but never anything close to 28.
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Old 05-15-2010, 10:33 AM
frmboybuck frmboybuck is offline
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Do more research and form your own opinion.....they changed it from the 14lb range with antisieze to the 28lb range without antisieze after all the blowout issues. That was part of the problem.....the plugs were coming loose and getting blown out.
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Old 05-15-2010, 06:12 PM
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Was told to do 12-14 ft lbs dry by an old Ford Tech. I think I'll go with his numbers.

Thanks
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Old 05-15-2010, 08:40 PM
frmboybuck frmboybuck is offline
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No problem....I was just trying to help you avoid a blown plug.
FAQs Why do you prefer 28-32 foot lbs torque instead of the factory specification
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Old 05-15-2010, 09:57 PM
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Figured the factory setting held up for 100,000 miles and they were very tight. The threads looked great so I torqued them to 170 in-Lbs.
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Old 04-21-2013, 05:02 PM
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Originally Posted by frmboybuck View Post
Do more research and form your own opinion.....they changed it from the 14lb range with antisieze to the 28lb range without antisieze after all the blowout issues. That was part of the problem.....the plugs were coming loose and getting blown out.
Plugs were getting blown out on the old NON-PI heads, specifically on the Lightning. Under boost, the plugs were pulling the threads out of the heads. In 97, 98, and early production 99 heads, they only had 4 threads. From late 99 until the 3-valve came out, the PI heads have 8.

That doesn't mean the torque spec doubled. We are still dealing with aluminum heads.
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Old 04-21-2013, 05:54 PM
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Plugs were getting blown out on the old NON-PI heads, specifically on the Lightning. Under boost, the plugs were pulling the threads out of the heads. In 97, 98, and early production 99 heads, they only had 4 threads. From late 99 until the 3-valve came out, the PI heads have 8.

That doesn't mean the torque spec doubled. We are still dealing with aluminum heads.
What constitutes the engine being a late 99? My truck is a 1999 model and was built in August of 99.
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Old 04-21-2013, 05:54 PM
frmboybuck frmboybuck is offline
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It's 28ft-lbs.....Not 200. Aluminum heads can easily handle 28

Quote:
Originally Posted by Crash! View Post
Plugs were getting blown out on the old NON-PI heads, specifically on the Lightning. Under boost, the plugs were pulling the threads out of the heads. In 97, 98, and early production 99 heads, they only had 4 threads. From late 99 until the 3-valve came out, the PI heads have 8.

That doesn't mean the torque spec doubled. We are still dealing with aluminum heads.
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Old 04-22-2013, 07:04 PM
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What constitutes the engine being a late 99? My truck is a 1999 model and was built in August of 99.
I would Consider that a late 99 as the probably starting making 2000s before the end of the year.

My 99 Was built in in october of 98. Obviously An early model and Spark Plug Number 3 Just blew out on me now. Been waiting for it to happen for a long time.
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Old 04-22-2013, 08:29 PM
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Wasn't much thread in the heads of my August 1999 built 99. Plugs have been holding for three years now. Knock on wood!
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