Posted by Bob on September 11, 2014 at 19:40:28 from (64.255.159.192):
In Reply to: stumped on spark issue posted by normmack on September 11, 2014 at 19:02:23:
Try sparking the individual wires to GROUND, rather than to their specific spark plugs, and compare the spark.
I'm gonna guess all 4 are gonna look the same.
When you are jumping the spark to the plugs, you introduce more variables... the sparkplugs themselves, the compression in the cylinders, and the fuel mixture in each cylinder.
By the way, have you done a compression test of all 4 cylinders... a blown gasket between #2 and #3 is a COMMON cause of a paired misfire like that.
(BTW, the one guy GUESSED you are working on a Ford... WHY not post the model, it's costs NO more to include all the pertinent information!)
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