Loss of power

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Loss of power

Postby B.O.B. » Sun May 17, 2020 9:50 am

I just feel like recently I have been losing some power. Minor missing during start up as well. Pulled plugs and they seem to have some weird pattern on them. Anyone ever see something like this. Almost seems like some kind of blow by or something.

There is like an oval discoloring on them.
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71' bronco, np435 w/trailbanger, 302 efi, 35" KM3 on 17x9 Fuel Anza, warn xd9000i, cage arms, 5" lift
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Re: Loss of power

Postby RJLougee » Tue May 19, 2020 5:09 pm

Where are the sealing rings? Looks like they are missing???

I'm used to seeing plugs like this:

Image
'70 Bronco, MAF 5.0, NP435, D44/9", 4.10s, 33" MT/Rs, PS/PB
'71 Bronco, HP D60, Hi-9, 5.38/ARBs, 101" WB, 408 Stroker, AOD, Atlas, 40" MT/Rs, PiMP EFI.
'78 F150 SWB/Stepside/4WD, 351W/4R100/NP205, 35" KM2s, under const...
'81 Coachman Caper XL MH, 4WD, EFI 460/ZF/BW1356, D44/Sterling, 4.10s/35s, under const...
'83 Bronco, D60/Sterling, 5.13/ARBs, MAF EFI 351W/ZF/BW1356, 37" MT/Rs.
'12 Buggy, HPD60, Hi-9, 4.10s, Explorer 5.0, Atlas 4-speed, my chassis, EB skins.
And the latest project is a '99 Ranger Extra-Cab, custom frame/tube work, on 40s...
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Re: Loss of power

Postby Kinder » Thu May 21, 2020 6:50 am

B.O.B. wrote:I just feel like recently I have been losing some power. Minor missing during start up as well. Pulled plugs and they seem to have some weird pattern on them. Anyone ever see something like this. Almost seems like some kind of blow by or something.

There is like an oval discoloring on them.
I’ve never really paid attention to the exterior of the plug, I usually just evaluate the color and wear on the electrodes and insulator, but I do think that coloring is odd. Do all the plugs have this or is it just one or two?
Best to Date MPG: 26.6
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Re: Loss of power

Postby ZOSO » Thu May 21, 2020 10:28 am

RJLougee wrote:Where are the sealing rings? Looks like they are missing???

I'm used to seeing plugs like this:

Image


Those plugs are old school and don't use washers. They are conical seats like lug nuts.

Bobby were they tight? if they weren't it could just have been leaking some on the compression stroke. Oil leaks? Maybe oil running down the valve covers and burning off when it hits the plugs.
Rob

74 Ranger EFI351w, 4r70w, ARB 5.13 9in, ARB 5.13D44, and a bunch of other goodies. Best of all the family memories.

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Re: Loss of power

Postby B.O.B. » Wed Aug 12, 2020 8:21 am

Ended up being a dirty MAF sensor. Guy at work used to build foxbodies and he said they are notorious for getting dirty and making an engine run like crap. Sprayed it down and got all my horsepower back. Do need to figure a better intake system. Need to find something with a 90 degree bend to make it a little longer.
71' bronco, np435 w/trailbanger, 302 efi, 35" KM3 on 17x9 Fuel Anza, warn xd9000i, cage arms, 5" lift
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