CarForum.net - Car Forums, Automotive News and Community
Home Gallery Register Calendar Members List

Go Back   CarForum.net - Car Forums, Automotive News and Community > General Car Discussion > General Automotive Discussion

Reply
LinkBack Thread Tools
Unread 02-23-2009, 12:11 PM   #1
Veteran Member
 
Funkycasey's Avatar
 
Join Date: Aug 2006
Location: Arkansas
Posts: 694
Rep: 71 Funkycasey will become famous soon enough
Default 1999 Ford Explorer fouling spark plugs

My 1999 Ford Explorer Sport keeps fouling just one of the 6 spark plugs...and it is always the same one each time. I have been pulling and replacing this one spark plug about 3 times in the past 6 months. It happens whenever i have to accelerate powerfully, like whenever i go on an interstate road trip. I can tell when the spark plug gets messed up, because my car will shake when accelerating/idling and will get poor gas mileage.

What is the problem, what should i do, and how much will this cost to fix? Thanks in advance
__________________
1999 Ford Explorer Sport 2 Door
Deck: Panasonic CQ-C8803U
Front: 2 x 6.5" CDT Audio Components w/ Silk Tweeters
Back: 2 x Infinity Reference 6x8's
Substage: In the works
Amps: 1 x Zapco C2K 4.0, 1 x Zapco C2K 9.0XD

Funkycasey is offline  
Reply With Quote
Unread 02-23-2009, 02:49 PM   #2
Veteran Member
 
Mr Car Guy's Avatar
 
Join Date: Mar 2008
Location: Surrey, BC, Canada
Posts: 2,052
Rep: 186 Mr Car Guy has a spectacular aura aboutMr Car Guy has a spectacular aura about
Default

How is it fouled?

Oil, fuel, carbon deposits?

Oil means that possibly valve seals are worn out.

Fuel means an injector is leaking.

Carbon deposits valve seals or blow by (not sure where the PCV connects)
__________________
2003 GMC Envoy 5.3

Mr Car Guy is offline Mr Car Guy's Gallery  
Reply With Quote
Unread 02-23-2009, 05:30 PM   #3
Veteran Member
 
Funkycasey's Avatar
 
Join Date: Aug 2006
Location: Arkansas
Posts: 694
Rep: 71 Funkycasey will become famous soon enough
Default

Actually, i just got the plug out successfully....it was very tight because those bastards at Ford overtightened it, but it came out alright. There was not much black on the plug filament or whatever itself. The thing is the insulation on the inside of the plug that covers the center electrode was cracked. Not the glass insulator that covers the whole spark plug, but that tiny bit of insulation that insulates the tip of the electrode....what would that mean? It seems to do that every time. I only have had one time where it came out looking all black and cruddy, and that was the first time that i took it out...haven't had that black stuff come out on a plug since.
__________________
1999 Ford Explorer Sport 2 Door
Deck: Panasonic CQ-C8803U
Front: 2 x 6.5" CDT Audio Components w/ Silk Tweeters
Back: 2 x Infinity Reference 6x8's
Substage: In the works
Amps: 1 x Zapco C2K 4.0, 1 x Zapco C2K 9.0XD

Funkycasey is offline  
Reply With Quote
Unread 02-23-2009, 07:43 PM   #4
Now accepting bribes.
 
lautinjr's Avatar
 
Join Date: Oct 2007
Location: Currently Las Vegas
Posts: 4,311
Rep: 193 lautinjr has a spectacular aura aboutlautinjr has a spectacular aura about
Default

Sounds like a Valve problem on that cylinder it could be the ciol is weak or a leaking or stuck injector but physical damage usually leads back to a more serious problem like a worn cam lope or bad valve.
__________________
Please help reduce our mini van population and wear condoms!

lautinjr is offline lautinjr's Gallery  
Reply With Quote
Unread 02-23-2009, 08:35 PM   #5
Veteran Member
 
Funkycasey's Avatar
 
Join Date: Aug 2006
Location: Arkansas
Posts: 694
Rep: 71 Funkycasey will become famous soon enough
Default

Well most of that is way above my head...im just glad i got the old plug out without stripping the hole like last time...it was hell getting that thing redneck towed over to Ford for them to fix it and replace the old plug for almost $100 bucks!

How much roughly would you estimate if it was what you thought it was?
__________________
1999 Ford Explorer Sport 2 Door
Deck: Panasonic CQ-C8803U
Front: 2 x 6.5" CDT Audio Components w/ Silk Tweeters
Back: 2 x Infinity Reference 6x8's
Substage: In the works
Amps: 1 x Zapco C2K 4.0, 1 x Zapco C2K 9.0XD

Funkycasey is offline  
Reply With Quote
Unread 02-23-2009, 08:47 PM   #6
Now accepting bribes.
 
lautinjr's Avatar
 
Join Date: Oct 2007
Location: Currently Las Vegas
Posts: 4,311
Rep: 193 lautinjr has a spectacular aura aboutlautinjr has a spectacular aura about
Default

Let's hope it's not your talking major repair depending on the motor 4.0L Sohc or 4.0L ohv it can also be a real pain i'm still hoping it's simple. So this is the same plug that was Helicioled a while back that could also be the colperate if it's not sitting far enough into the combustion chamber it could be causing a premature failure.
__________________
Please help reduce our mini van population and wear condoms!

lautinjr is offline lautinjr's Gallery  
Reply With Quote
Unread 02-24-2009, 03:46 PM   #7
Veteran Member
 
Funkycasey's Avatar
 
Join Date: Aug 2006
Location: Arkansas
Posts: 694
Rep: 71 Funkycasey will become famous soon enough
Default

Yep, same one that got the helicoil the last time i had to take it in....but before i had to get that done, it was doing it before then too, so i dunno. I'm not gonna even worry about it, because i don't plan on having it too much longer, and it will be cheaper to just replace the plug every few months....
__________________
1999 Ford Explorer Sport 2 Door
Deck: Panasonic CQ-C8803U
Front: 2 x 6.5" CDT Audio Components w/ Silk Tweeters
Back: 2 x Infinity Reference 6x8's
Substage: In the works
Amps: 1 x Zapco C2K 4.0, 1 x Zapco C2K 9.0XD

Funkycasey is offline  
Reply With Quote
Reply

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -5. The time now is 04:21 PM.

Shogun Interactive Development Copyright 2015 Shogun Interactive Development. All rights reserved.