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Changed the plugs and did a drop in k&n filter, on my new to me 2010 lifted f150 5.4 with 135k miles on it, as I am getting about 10.5-11 mpg avg hiway, verified by filling the tank driving it for 3/4 of a tank then filling the tank and dividing miles driven (verified by gps) by gal used.
Didn't notice any change in mpg, and still have an occasional rough idle and stumbling, no codes. I searched and read a ton of threads, but didn't see how often you should change coils? Would it be worth changing them or am I just wasting money? And I'm assuming just oem is fine.
Also tempted to throw a can of seafoam in the tank, any reason not to on this truck? Trying to get the fuel millage descent or at least as best as possible as I drive about 40-50 miles every day of freeway. Wanting to get the mechanical stuff done before buying a tuner.
When they go bad, noticeable by extremely low power due to misfires which will also cause the whole truck to shake especially under a load usually followed with misfire codes and a check engine light.
With that said, @ 135,000 miles it's probably time as the plugs them selves are only rated to 100,000 miles.
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I replaced them as they went bad on my 2001, which I just sold 3 months ago with 260k miles on it. I replaced 5 of them over the last 2 years as they went. I don't see any reason to replace them before they go bad.
I used the ones from Autozone that came with a lifetime warranty, I think they were $40-60 each. Never had to replace any of the new ones.
I replaced them as they went bad on my 2001, which I just sold 3 months ago with 260k miles on it. I replaced 5 of them over the last 2 years as they went. I don't see any reason to replace them before they go bad.
I used the ones from Autozone that came with a lifetime warranty, I think they were $40-60 each. Never had to replace any of the new ones.
I also put 15 years and 180K miles on my 2001 Lariat. Over that time I replaced three coil packs....when the shuddering started and the CEL came on.
Yeah really. Surprised the hell out of me. The sticker they had on them was curling up at one corner so I peeled it back and saw the Motorcraft logo with part #.
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Yeah really. Surprised the hell out of me. The sticker they had on them was curling up at one corner so I peeled it back and saw the Motorcraft logo with part #.
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There's a lot of this going around now, after years of replacing cheap parts under warranty carquest/advance auto now use OEM parts for their MAF sensors and fuel pumps. They made it a point to visit our shop and tell us that if we order a fuel pump or a MAF for a Ford we'll get a carquest box with a brand new Ford part in it.
01-24-2018, 03:59 PM
How often to change coils?
