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The Terminator
Engine/Tuning
Can worn out plain copper spark plugs cause a slight rich condition?
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<blockquote data-quote="IUP99snake" data-source="post: 13869188" data-attributes="member: 7060"><p>Will a worn set of copper plugs affect the air fuel ratio? </p><p></p><p>Over the course of a month or two, I noticed that the average air fuel ratio during idle and part throttle driving has become slightly more rich than it used to be. </p><p></p><p>According to my AEM Wideband Failsafe gauge the air fuel ratio used to show between 14.0 and 15.0 (closer to 14.6-14.7 most of the time) during idle and part-throttle cruising on the highway. Now, it averages about 1 point lower, 13.0-14.0 (closer to 13.6 to 14.6 most of the time) under the same driving conditions. </p><p></p><p>Since installing the procharger a long time ago, I've always run plain copper plugs and changed them about every 10K miles or so because they wear out much sooner than platinum tipped plugs, even if they aren't actually "fouled". </p><p></p><p>I know I'm due to change my plugs, it's been a good 11,000 miles at least since I last changed them. </p><p></p><p>Although the power and driveability haven't deteriorated, I'm wondering if old worn copper plugs can cause the type of condition I'm experiencing. </p><p></p><p>My wideband gauge is newer than my current set of plugs so I have no idea how the air fuel ratio may be affected over the lifespan of copper plugs. Since I didn't have the wideband before, I would have never noticed if it was running slightly richer when my plugs near the end of their lifespan.</p></blockquote><p></p>
[QUOTE="IUP99snake, post: 13869188, member: 7060"] Will a worn set of copper plugs affect the air fuel ratio? Over the course of a month or two, I noticed that the average air fuel ratio during idle and part throttle driving has become slightly more rich than it used to be. According to my AEM Wideband Failsafe gauge the air fuel ratio used to show between 14.0 and 15.0 (closer to 14.6-14.7 most of the time) during idle and part-throttle cruising on the highway. Now, it averages about 1 point lower, 13.0-14.0 (closer to 13.6 to 14.6 most of the time) under the same driving conditions. Since installing the procharger a long time ago, I've always run plain copper plugs and changed them about every 10K miles or so because they wear out much sooner than platinum tipped plugs, even if they aren't actually "fouled". I know I'm due to change my plugs, it's been a good 11,000 miles at least since I last changed them. Although the power and driveability haven't deteriorated, I'm wondering if old worn copper plugs can cause the type of condition I'm experiencing. My wideband gauge is newer than my current set of plugs so I have no idea how the air fuel ratio may be affected over the lifespan of copper plugs. Since I didn't have the wideband before, I would have never noticed if it was running slightly richer when my plugs near the end of their lifespan. [/QUOTE]
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Can worn out plain copper spark plugs cause a slight rich condition?
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