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SVT Shelby GT500
Random Misfire?
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<blockquote data-quote="PRP" data-source="post: 13644724" data-attributes="member: 97061"><p>It might not.</p><p></p><p>I had a car come in for a smog check and it failed. The owner had just 'tuned it up' and installed new plugs. The problem was that he didn't gap the plugs out of the box and the plugs were gapped too tight. That made the spark duration too short and didn't burn all of the fuel in the chamber causing high HC (i.e. misfire) and CO ('too rich) due to the unburned fuel caused by a spark that wasn't long enough (in time).</p><p></p><p>I found it with a O-scope, pulled the plugs, regapped to Mfgr. spec, re-installed them and passed the (Calif) smog check with flying colors. In fact, that car (a Ford mini van) had the highest CO2 reading (an indication of engine efficiency) I've ever seen on a car (almost 17%).</p><p></p><p></p><p>Phill</p></blockquote><p></p>
[QUOTE="PRP, post: 13644724, member: 97061"] It might not. I had a car come in for a smog check and it failed. The owner had just 'tuned it up' and installed new plugs. The problem was that he didn't gap the plugs out of the box and the plugs were gapped too tight. That made the spark duration too short and didn't burn all of the fuel in the chamber causing high HC (i.e. misfire) and CO ('too rich) due to the unburned fuel caused by a spark that wasn't long enough (in time). I found it with a O-scope, pulled the plugs, regapped to Mfgr. spec, re-installed them and passed the (Calif) smog check with flying colors. In fact, that car (a Ford mini van) had the highest CO2 reading (an indication of engine efficiency) I've ever seen on a car (almost 17%). Phill [/QUOTE]
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Random Misfire?
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