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Keep in mind that the plugs in the EB have a very fine pointed center electrode, so the spark is concentrated in one area, which creates the pit I was referring to. Difficult to get a good picture of it without bending the ground up though.
It's the pitting that causes the misfires as the miles pile on, and why plugs are being replaced at 1/3rd the recommended change interval. I have almost 23K on my truck so far, and run a tune, so the moment I start feeling a misfire, I will pull a plug and check. If it is pitted I will try to get a good picture of it. Shouldn't be too long from now either, my last truck started doing it around 28K miles.
Keep in mind that the plugs in the EB have a very fine pointed center electrode, so the spark is concentrated in one area, which creates the pit I was referring to. Difficult to get a good picture of it without bending the ground up though.
It's the pitting that causes the misfires as the miles pile on, and why plugs are being replaced at 1/3rd the recommended change interval. I have almost 23K on my truck so far, and run a tune, so the moment I start feeling a misfire, I will pull a plug and check. If it is pitted I will try to get a good picture of it. Shouldn't be too long from now either, my last truck started doing it around 28K miles.
what are you doing in your tune that causes this issue? significantly higher boost - more fuel? I ask because that doesn't come out to be an problem in the testing stock. so you must be significantly off map to have this - in my mind.
I received the feeler gauge today and checked the gaps on the old plugs. Each one was w/in spec between 0.028 and 0.030 - None of them had a gap larger then 0.030. I may go a little longer than 30K next change but probably not significantly beyond that given the tune.
what are you doing in your tune that causes this issue? significantly higher boost - more fuel? I ask because that doesn't come out to be an problem in the testing stock. so you must be significantly off map to have this - in my mind.
The misfires were with my 2014 with a 5* tune. It had 3.15 gearing which in 6th full lockup @ 60 MPH turned 1400RPM. When going up a slight grade it would misfire when the gap increased. When fresh and gapped at .028, no misfires. It wasn't enough to set any codes, but could be felt. When running stock it wasn't noticed.
I replaced mine on my 2015 2.7l at about 33,000 miles. Installed stock replacement SP-542 Motorcraft plugs. The new ones were about 0.030", I gapped them to 0.028". All of the old ones were at least 0.035", electrodes looked fairly sharp, maybe some pitting on the ground straps (just by inspecting with a magnifying glass in good light).
I replaced mine on my 2015 2.7l at about 33,000 miles. Installed stock replacement SP-542 Motorcraft plugs. The new ones were about 0.030", I gapped them to 0.028". All of the old ones were at least 0.035", electrodes looked fairly sharp, maybe some pitting on the ground straps (just by inspecting with a magnifying glass in good light).
09-08-2017, 11:31 AM
to change !