did oil change, fuel filter, compression test and new spark plugs since it hadnt been done in 18 months. roughly 5,000 miles. supercharger has been on it for 3 years with 28,000 miles on 8-9psi



plugs in order bank 1 and bank 2 (1-4, 5-8)

1: 150psi gap .032
2: 152psi gap .028
3: 151psi gap .034
4: 125psi gap .028 rusted seat o-ring wouldn't seal good

5: 150psi gap .028
6: 150psi gap .028
7: 152psi gap .032
8: 150psi gap .028

i run an NGK 4177 (TR6) plug @ .028gap and change them once a year or whenever one feels like its not hitting right usually 4 and 8 are rusted and not sparking good.

im sure if i cleaned the seat on number 4 it would read the same compression as the rest tests were done with a 1976 matco compression tester so gauge could be reading off just a bit.

 

Looks like you wash off your engine and get water down in those holes. I would force the water out with compressed air after I washed the engine to prevent those spark plugs rusting up like that.

 

The sparkplug connections look good... although we cannot look 360 degrees around the ceramic for a good boot seal. Alot of those other plugs look severely corroded. I hope you are not using a caustic cleaner. They do far more harm than good...

 

havent washed under the engine bay in over 7 years.. rain water gets into the back 2 plugs.

 

i spray them with WD40 when i install them to help with proper torque

 

Here's what mine look like after about 10k... plus Torco in every tank. Orange buildup is from the Torco. But I have no external corrosion like you do. You must have alot of salts getting kicked up into your engine bay. BTW, I use a copper anti-seeze on the plug threads... overkill I know... but it works too

 

ive got a ford modular motor the plugs are on top near the intake runners and injectors.. water seeps in under the hood seal when it rains and drips down on top of 4 and plug 8.



using anti-sieze on our motors is asking for the plug to back out and shoot out like a rocket. its recommended to just clean the threads well and spray them with some sort of light spray lube and torque them properly. there is only 3-4 threads on my heads for the plugs to grab. in 2003 ford fixed the issue by going to an 8 thread head for the spark plugs because there was lots of user error in people who would over torque and cross thread and then their plugs would shoot out.

 

these are the plugs from when i changed them last i tried BR7EF plugs 2-10-10 was when they were changed last.








and here is 1-3 july 19 2009 when i changed them prior

 

the BR7EF were too cold of a plug and the truck ran poorly on them so i went back to the TR6

 

Well, I feel like an ***... ASSumed you had a Chevy. Makes since if the Ford plugs are mounted more vertically and the wells holding more moisture...

Minus the exterior corrosion... your plugs look good to me