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Krusty
Calgary, Alberta,Canada
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Joined: 04/26/2003
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It's ignition misfire. Replace your spark plugs and your ignition coil boots. Make sure the spark plug gap is set to the low end of the spec and make sure to put a bit of dielectric grease around the inside of the boot.
Krusty
92 F-250 4x4 460 5spd 4.10LS Prodigy
97 Rustler RT190
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Groover
Pulaski, TN
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Joined: 10/17/2007
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I have checked for pending codes and found none then chalked the tires and found that they are not slipping. I was disappointed there as I am going to need new tires soon anyway.
The truck only has 55,000 miles on it but nearly half of that has been trailer towing so the plugs may well be nearing their end of life and the boots have seen a lot heat. I am going to follow the recommendations of new plugs and boots.
I am also going to check the transmission fluid. Even if it looks good I plan to change the filter and what is in the pan.
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Krusty
Calgary, Alberta,Canada
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Joined: 04/26/2003
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Pull the spark plugs for inspection. I suspect one will have carbon tracking visible down the side of the white porcelain insulator near where the part# is printed. This is caused by your misfire and quite common on 3.5 eco. When the plugs get worn, they are sometimes unable to fire through the high cylinder pressures when you are under load, and the spark will find it easier to jump down the outside of the plug to ground, leaving the carbon track as evidence.
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blofgren
Surrey, B.C.
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Joined: 11/26/2005
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Krusty wrote:Pull the spark plugs for inspection. I suspect one will have carbon tracking visible down the side of the white porcelain insulator near where the part# is printed. This is caused by your misfire and quite common on 3.5 eco. When the plugs get worn, they are sometimes unable to fire through the high cylinder pressures when you are under load, and the spark will find it easier to jump down the outside of the plug to ground, leaving the carbon track as evidence.
This makes total sense. It seems that the DI engines eat spark plugs quite frequently.
2013 Ram 3500 Megacab DRW Laramie 4x4, 6.7L Cummins, G56, 3.73, Maximum Steel, black lthr, B&W RVK3670 hitch, Retrax, Linex, and a bunch of options incl. cargo camera
2008 Corsair Excella Platinum 34.5 CKTS fifth wheel with winter package & disc brakes
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ajriding
st clair
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Joined: 12/28/2004
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I would not suspect the trans for a bump, it should be the opposite of a bump if trans is going out, but I digress...
Trans fluid can be "changed" but you only change some of it, so the new mixes with the old and is immediately dirty, so unless you see burnt fluid you can't go by the cleanliness of it.
Do you monitor trans temps?
One misfire should not bump, should be barely discernible but I would surely start with the engine plugs.
Mostly, you need to ask an F150 forum, we don't know much here, but do yell at kids to get off our lawn a lot. The Ford forums are slammed with lemons.
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Groover
Pulaski, TN
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Joined: 10/17/2007
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I was delayed by weather and life in general but I finally got the plugs changed and took if for a test drive that included going up the same hills where it was acting up. That was running about 55mph in 3rd gear at max boost. Everything seems to be good.
I have watched the dash gage for transmission temperature before and never saw it increase from normal operating temperature. I suspect that may not be accurate but never got around to figuring out a better way to monitor it. I hope to work in dropping the transmission pan soon and replace the filter. If everything looks good I will stop with just cleaning it up and replacing that portion of the fluid.
Thanks for the help!
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Grit dog
Black Diamond, WA
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Joined: 05/06/2013
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ajriding wrote:I would not suspect the trans for a bump, it should be the opposite of a bump if trans is going out, but I digress...
Trans fluid can be "changed" but you only change some of it, so the new mixes with the old and is immediately dirty, so unless you see burnt fluid you can't go by the cleanliness of it.
Do you monitor trans temps?
One misfire should not bump, should be barely discernible but I would surely start with the engine plugs.
Not sure where your relevant experience comes from with this advice, but suffice it to say, it's largely inaccurate on most accounts.
2016 Ram 2500, MotorOps.ca EFIlive tuned, 5” turbo back, 6" lift on 37s
2017 Heartland Torque T29 - Sold.
Couple of Arctic Fox TCs - Sold
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