New Spark Plugs!!!
02-03-2014, 12:08 PM
#41
AK - that looks like detonation. Just the one plug?
02-03-2014, 02:44 PM
#42
I recently changed out plugs and COPS, used Motorcraft platinum plugs - went a week with no problems, then started getting a weird surging at highway speed, plugged in OBDII - showed misfire on 6. SO I changed out the COP with a different one - and it still misfired, changed out the plug with a new one, and the problem went away. This meant to me that the *plug* was the culprit - and I just didn't think that could happen..I mean, what would make a plug fail? This was a brand new plug...less than two weeks old at that point?
02-03-2014, 02:52 PM
#43
That's why I hand-inspect every plug that I buy, over the counter ( no i-sales for me for this reason ). I once went through an entire shipment to find 3 good sets of 8 7989's.
Some folks even found spinning ground shields on MC plugs ( not SP-515's )(so much fer the gas seal).
Dang gorillas must drop-kicked 'em, lol.
02-03-2014, 05:35 PM
#44
BAMF Club
I hope not. The original plugs had around 100k on them and none of them were that bad. I hoping it was just a defective plug. Truck is running smoother than ever though.