Rough Idle on my '05 G35
If the well tube oil seals fail it can fill up the spark plug well tube with oil and cause a misfire, fairly common with higher mileage.
Visually inspecting the spark plugs for color and gap can tell you which cylinder is misfiring, unless it's throwing a code for an exact cylinder misfire this is by FAR the easiest way to tell which cylinder is the culprit. Compare all 6 spark plugs and it's usually obvious which one is the problem child.
Visually inspecting the spark plugs for color and gap can tell you which cylinder is misfiring, unless it's throwing a code for an exact cylinder misfire this is by FAR the easiest way to tell which cylinder is the culprit. Compare all 6 spark plugs and it's usually obvious which one is the problem child.
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Rehman2009
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