spark plugs? how often replace?
Joined: Jul 2014
Posts: 13,830
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From: Chesterfield VA
Are your plugs loose when you re-torque them? Just curious. Never heard of any requirement to do this.
Maintenance schedule in the pre-2006 owners manual specifies new spark plugs at 105,000 miles. In 2006 and later change whenever the Maintenance Minder calls for them. Plugs are comparatively cheap and I changed mine at about 40,000 miles when I did the valve adjustment in my 2006 car. They were out anyway (engine is easier to turn over by hand without them) so I put new ones in.
-- Chuck
Maintenance schedule in the pre-2006 owners manual specifies new spark plugs at 105,000 miles. In 2006 and later change whenever the Maintenance Minder calls for them. Plugs are comparatively cheap and I changed mine at about 40,000 miles when I did the valve adjustment in my 2006 car. They were out anyway (engine is easier to turn over by hand without them) so I put new ones in.
-- Chuck
Thread Starter
Joined: Sep 2011
Posts: 602
Likes: 18
Are your plugs loose when you re-torque them? Just curious. Never heard of any requirement to do this.
Maintenance schedule in the pre-2006 owners manual specifies new spark plugs at 105,000 miles. In 2006 and later change whenever the Maintenance Minder calls for them. Plugs are comparatively cheap and I changed mine at about 40,000 miles when I did the valve adjustment in my 2006 car. They were out anyway (engine is easier to turn over by hand without them) so I put new ones in.
-- Chuck
Maintenance schedule in the pre-2006 owners manual specifies new spark plugs at 105,000 miles. In 2006 and later change whenever the Maintenance Minder calls for them. Plugs are comparatively cheap and I changed mine at about 40,000 miles when I did the valve adjustment in my 2006 car. They were out anyway (engine is easier to turn over by hand without them) so I put new ones in.
-- Chuck
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Joined: Apr 2003
Posts: 8,595
Likes: 54
From: Temple City
might wanna recalibrate your feel and see if you're actually getting it to 22 ft/lbs.
also, depending on which plugs you use, on initial install there might be specific install instructions such as 3/4 turn after contact or something like that.
i suspect feel is the culprit here, plugs shouldn't be backing out.
also, depending on which plugs you use, on initial install there might be specific install instructions such as 3/4 turn after contact or something like that.
i suspect feel is the culprit here, plugs shouldn't be backing out.
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Joined: Aug 2012
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From: Foothills East of Sacramento
Are your plugs loose when you re-torque them? Just curious. Never heard of any requirement to do this.
Maintenance schedule in the pre-2006 owners manual specifies new spark plugs at 105,000 miles. In 2006 and later change whenever the Maintenance Minder calls for them. Plugs are comparatively cheap and I changed mine at about 40,000 miles when I did the valve adjustment in my 2006 car. They were out anyway (engine is easier to turn over by hand without them) so I put new ones in.
-- Chuck
Maintenance schedule in the pre-2006 owners manual specifies new spark plugs at 105,000 miles. In 2006 and later change whenever the Maintenance Minder calls for them. Plugs are comparatively cheap and I changed mine at about 40,000 miles when I did the valve adjustment in my 2006 car. They were out anyway (engine is easier to turn over by hand without them) so I put new ones in.
-- Chuck
Billman recommends 22 ft/lbs. He had a spare head and ran a test to see how far he could torque a plug before failure. As I recall he went to 70-80 ft/lbs before the plug failed. The threads were still intact.
All kinds of problems rise to the surface from loose plugs. Just torque them down right the first time. Don't use anti-sieze on NGK plugs. They have a coating called trivalent plating. This silver-or-chrome colored finish on the threads is designed to provide corrosion resistance against moisture and chemicals. The coating also acts as a release agent during spark plug removal.
Joined: Nov 2010
Posts: 443
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From: Cape Cod
Since this is the Racing and Competition forum, change them at least at the beginning of the race season, whether or not they need it. For everything else that you are spending on a "race" car, spark plugs are relatively inexpensive.