another spark plug question
Laughing Gas
Joined: May 2008
Posts: 939
Likes: 1
From: Central Kansas
Post Fiend
Joined: Mar 2009
Posts: 11,798
Likes: 14
From: Mt. Shasta California
FWIW, the latest TSB calls for carb cleaner instead of penetrating oil as it breaks up the carbon better. Also calls for a cold engine only.
Well maybe I was wrong, this says that SP515 replaced the 507. Which Plug Part Number? - Ford Truck Enthusiasts Forums
Well maybe I was wrong, this says that SP515 replaced the 507. Which Plug Part Number? - Ford Truck Enthusiasts Forums
Fleet Owner
Joined: Apr 2012
Posts: 27,307
Likes: 549
From: Spanaway
Really the only reason to use a hotter plug is when you get the old ones
out and find they are not the light tan color and are dark or your burning
oil. Your not running an engine with a carburetor on it so if for some reason you
found that the plugs looked like you were running rich then you have other
problems that need to be looked into. With the closed loop systems now a days
you should not ever really see a rich condition that is why you have O2 sensors
and a computer to tell the injectors just how much to inject so you right at the
stoichiometric ratio for gasoline. If you change temps you can end up with a
hot spot and have pre-ignition and that would not be good.
Sean
out and find they are not the light tan color and are dark or your burning
oil. Your not running an engine with a carburetor on it so if for some reason you
found that the plugs looked like you were running rich then you have other
problems that need to be looked into. With the closed loop systems now a days
you should not ever really see a rich condition that is why you have O2 sensors
and a computer to tell the injectors just how much to inject so you right at the
stoichiometric ratio for gasoline. If you change temps you can end up with a
hot spot and have pre-ignition and that would not be good.
Sean
Laughing Gas
Joined: May 2008
Posts: 939
Likes: 1
From: Central Kansas
That's what the latest TSB (08-7-6) calls for - the idea is that the carb cleaner will wick down and dissolve or soften the carbon so the plugs will come out easier. Whether or not it works better than penetrating oil, I don't know but Ford must think it does.
Post Fiend
Joined: Mar 2009
Posts: 11,798
Likes: 14
From: Mt. Shasta California
Sounds right to me.
Thread Starter
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Freshman User
Joined: Oct 2012
Posts: 25
Likes: 0
sorry bigpigdaddy, dont mean to sound ungrateful, but just how many plugs can they make for 1 motor? I just need the factory plug, i'm usually pretty easy on my baby
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Post Fiend
Joined: Mar 2009
Posts: 11,798
Likes: 14
From: Mt. Shasta California
Your biggest criteria is going to be; which plug will not break in 2 pieces next time I change them. If you don't do this right it's going to cost you big bucks!
Laughing Gas
Joined: May 2008
Posts: 939
Likes: 1
From: Central Kansas
You might get more exact help posting this over in the 2004-08 F150 forum, they have the same engine and are probably better versed in the details. 2004 - 2008 F150 - Ford Truck Enthusiasts Forums
IMO, the anti-seize is what prevents that. When I first got my truck, I didn't realize the plugs had already been changed, it had a miss and after a coil didn't fix it I was dreading the plugs (turned out to be an injector though). I finally got up the nerve and followed the TSB to the letter - I was shocked when it unscrewed like a new one. You could still see anti-seize on the plug. Now I admit I don't know how long the plugs had been in, but there was some discoloration so they'd been in for a little while anyway.
Post Fiend
Joined: Mar 2009
Posts: 11,798
Likes: 14
From: Mt. Shasta California
I believe the sp479 was for the older 2 valve engines, they were a one piece plug but not even sure they'll thread into a 3v head. In the Motorcraft line, you want either the sp507 or sp515...and to be honest I'm not sure what the difference exactly is, whether the 515 replaced the 507 or they still make both and the 515 is hotter. Sorry can't be of more help.
You might get more exact help posting this over in the 2004-08 F150 forum, they have the same engine and are probably better versed in the details. 2004 - 2008 F150 - Ford Truck Enthusiasts Forums
IMO, the anti-seize is what prevents that. When I first got my truck, I didn't realize the plugs had already been changed, it had a miss and after a coil didn't fix it I was dreading the plugs (turned out to be an injector though). I finally got up the nerve and followed the TSB to the letter - I was shocked when it unscrewed like a new one. You could still see anti-seize on the plug. Now I admit I don't know how long the plugs had been in, but there was some discoloration so they'd been in for a little while anyway.
You might get more exact help posting this over in the 2004-08 F150 forum, they have the same engine and are probably better versed in the details. 2004 - 2008 F150 - Ford Truck Enthusiasts Forums
IMO, the anti-seize is what prevents that. When I first got my truck, I didn't realize the plugs had already been changed, it had a miss and after a coil didn't fix it I was dreading the plugs (turned out to be an injector though). I finally got up the nerve and followed the TSB to the letter - I was shocked when it unscrewed like a new one. You could still see anti-seize on the plug. Now I admit I don't know how long the plugs had been in, but there was some discoloration so they'd been in for a little while anyway.
Laughing Gas
Joined: May 2008
Posts: 939
Likes: 1
From: Central Kansas
But that's precisely what the anti-seize is supposed to prevent. The part that always sticks in the head isn't the threaded part, it's the "ground electrode shield" below the threads. With the anti-seize on there, the carbon can't stick as well. Before I took my plug out, believe me, I read everything I could find. I was paranoid.
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