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White eroded plugs, stuck plug, and part question

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bradleyheathhays
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Posts: 8
Joined: Wed Feb 07, 2018 2:42 am
Vehicle: 02 Ford Taurus SES 3.0

White eroded plugs, stuck plug, and part question

Post by bradleyheathhays » Thu Oct 04, 2018 1:44 am

Just bought a '11 Crown Vic w/ 270k miles a couple months ago and finally got around to replacing the plugs today. They all looked like this..
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All with heavy white deposits as well as both top and bottom electrodes eroded. Gap on these should be 41-47 and they were measuring about 80. So first question is what do the white deposits and eroded electrodes indicate?

Everything was going well until I get to the last plug in cyl 4, all the way back on the left. Thing was/is in crazy tight. After cranking back and forth for a while the best I could get out of it was 1/8 turn. It moves fairly easily within that limit but comes to a dead stop at the ends of the turn. What could have caused something like this? I think the mechanics taking care of it before me were hacks. Car started out as a police vehicle then was a cab before I got it.

My only idea is to heat the engine up and see if it'll twist out. Although I'd have to be careful as I'm sure hot threads would strip easily. Not really sure if that'd be a good idea.

Any advice on how to proceed here?

And last I broke a tiny clip at the end of the tube in the bottom center of this pic and have to replace it now...
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I think it's part of the evap system but not sure. Anybody know what it's called, part number, or how I would search for it on ebay?


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Re: White eroded plugs, stuck plug, and part question

Post by Webmaster » Thu Oct 04, 2018 2:42 pm

I'm no expert on reading spark plugs but... check out this link: https://www.onallcylinders.com/2012/12/ ... ark-plugs/

Given that crazy big gap I'm not surprised. The gaps were way too big on my 03 F150 last time I changed plugs.

I would recommend you just run top quality fuel and check your new plugs after 1,000 miles. The big gap could throw out the reading, maybe causing that white-ness / ash.

As for the plug you're having issues getting out... it's too bad you don't know what's going on down there. If the previous owner put in a heli-coil or time-sert replacement threads, who knows.

When I had a stuck #4 plug on my F150, I poured in 1-2 tbsp of carb cleaner and let it soak (crack the plug a little first). Let the carb cleaner eat at any carbon plus it helps lubricate the threads. Then just try to loosen/tighten the plug repeatedly to see if it will slowly come out further. Don't force it too hard, just go back and forth to see if it loosens up any. I wouldn't try to heat the engine up, I'd do that while cold.

If it continues to just flat out stop at the same spot, honestly I would either live with it or let a real pro look at it (Ford dealer?).
2000 Ford Taurus SEL (excellent car, sold to a friend)
1992 Mercury Sable GS (good car except for the tranny, sold)
Current: 03 F150 King Ranch SuperCrew
Other Fords owned: 02 F150 SuperCrew 4x4, 11 F150 EcoBoost, 07 Ranger, 01 F150 XLT, 98 F150 XLT, 96 Thunderbird LX, 95 Escort GT, 86 Mustang LX, 82 Mustang

bradleyheathhays
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Posts: 8
Joined: Wed Feb 07, 2018 2:42 am
Vehicle: 02 Ford Taurus SES 3.0

Re: White eroded plugs, stuck plug, and part question

Post by bradleyheathhays » Thu Oct 04, 2018 5:55 pm

Thanks for the advice Webmaster. I'll soak with carb cleaner like you mentioned and see what comes of it. I've heard a 50/50 solution of acetone and transmission fluid is the best penetrating solution for stubborn bolts. It's not sold anywhere so you have to make it up yourself. Think there'd be any problem using something like this if the carb cleaner didn't work?

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Re: White eroded plugs, stuck plug, and part question

Post by Webmaster » Fri Oct 05, 2018 10:47 am

You don't want to use penetrating fluid, that's the wrong thing. You're not trying to remove a rusted bolt, you're trying to dissolve carbon deposits (most likely). If the carb cleaner doesn't work it wouldn't hurt to try. Just don't put too much liquid down there as it will seep past and go into the cylinder. That's why I suggest 1-2 Tbsp.
2000 Ford Taurus SEL (excellent car, sold to a friend)
1992 Mercury Sable GS (good car except for the tranny, sold)
Current: 03 F150 King Ranch SuperCrew
Other Fords owned: 02 F150 SuperCrew 4x4, 11 F150 EcoBoost, 07 Ranger, 01 F150 XLT, 98 F150 XLT, 96 Thunderbird LX, 95 Escort GT, 86 Mustang LX, 82 Mustang

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