what's wrong here
Thread Starter
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Freshman User
Joined: Dec 2010
Posts: 32
Likes: 1
From: 30 miles east of Seattle
what's wrong here
My 390 in my 75 F250 has been running oddly. Just feels like it isn't smooth or strong as usual.
I changed the plugs. I've seen plugs run white or dark but never brown before. Any ideas what's going on here?
I changed the plugs. I've seen plugs run white or dark but never brown before. Any ideas what's going on here?
Post Fiend
Joined: Apr 2008
Posts: 8,261
Likes: 15
From: Big Sky Country
The brownish/red hue is most likely from additives in your gasoline, looks as though you may be running a little rich too, might want to lean out your fuel mixture a bit, maybe consider stepping up one heat range to burn off those deposits.
Posting Guru
Joined: Dec 2010
Posts: 1,240
Likes: 2
From: Chino Hills
That plug is the additives on it like the guy above said.
From what I see your AFR is just about right with maybe with just a bit of oil blow by the burned oil looking stuff on the rim of the plug.
From what I see your AFR is just about right with maybe with just a bit of oil blow by the burned oil looking stuff on the rim of the plug.
Thread Starter
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Freshman User
Joined: Dec 2010
Posts: 32
Likes: 1
From: 30 miles east of Seattle
Well...interesting...I haven't been addding any additives to my tank since last summer. I always fill up at the Shell station in my small town. I always use the same pump because the old trucks gas fill tube is disfigured so a normal fuel hose backs up spilling all down the side of the truck. This pump has an old style nozzle. It's the only place thats an easy fill up.
I guess I'll carefully and slowly fill up in the city from now on to see if it helps.
thanks for the advice.
I guess I'll carefully and slowly fill up in the city from now on to see if it helps.
thanks for the advice.
