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.
Loss of power
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B.O.B.
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Loss of power
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71' bronco, np435 w/trailbanger, 302 efi, 35" KM3 on 17x9 Fuel Anza, warn xd9000i, cage arms, 5" lift
- RJLougee
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- Joined: Thu Sep 30, 2010 12:40 pm
Re: Loss of power
Where are the sealing rings? Looks like they are missing???
I'm used to seeing plugs like this:

I'm used to seeing plugs like this:

'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...
'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...
- Kinder
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- Joined: Wed Sep 29, 2010 9:03 pm
Re: Loss of power
IΓÇÖve 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?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.
Best to Date MPG: 26.6
- ZOSO
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Re: Loss of power
RJLougee wrote:Where are the sealing rings? Looks like they are missing???
I'm used to seeing plugs like this:
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.
04 Mustang Cobra, KenneBell 2.2 feeding a lot of boost on E85. Tire shredding machine
New project: 77 Bronco Ranger, body work and more body work.
Very little left of a 72 durango tan explorer sport
74 Ranger EFI351w, 4r70w, ARB 5.13 9in, ARB 5.13D44, and a bunch of other goodies. Best of all the family memories.
04 Mustang Cobra, KenneBell 2.2 feeding a lot of boost on E85. Tire shredding machine
New project: 77 Bronco Ranger, body work and more body work.
Very little left of a 72 durango tan explorer sport
-
B.O.B.
- Official CCB Member

- Posts: 777
- Joined: Thu Nov 11, 2010 9:31 am
Re: Loss of power
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