Ford GT spark plugs


Seymour

Permanent Vacation
Jan 24, 2010
1
A respected GT tuner is highly recomending the NGK 4177 as a great plug to run in my 2006 GT. Of course I'll need to replace it more often but he feels the engine runs better. Comments?
 

tmcphail

GT Owner/Vendor
Mark IV Lifetime
Apr 24, 2006
4,077
St Augustine, Florida
In my mind the only reason to deviate from the stock plugs would vary greatly on what modifications where done to the vehicle and the end use of the vehicle IE road racing predominately or street use ECT.
 

MNJason

GT Owner
May 14, 2010
2,072
San Diego
How often should plugs be replaced?
 

fjpikul

GT Owner
Mark IV Lifetime
Le Mans 2010 Supporter
Jan 4, 2006
11,083
Belleville, IL
MNJason - Note that the starter of this thread is on permanent vacation. Your owner's manual says 100K. If you've modded the engine, then you need to talk to whomever did the mods.
 

MNJason

GT Owner
May 14, 2010
2,072
San Diego
MNJason - Note that the starter of this thread is on permanent vacation. Your owner's manual says 100K.

LOL - just saw that. I have a stock 05 with 9k miles so guess I am safe! I was mainly wondering because the GT guys are here this week and I could add it to the list.
 

RALPHIE

GT Owner
Mar 1, 2007
7,279
Guess I'm "Old School," but I try to replace mine every 25,000 miles. They look good when removed, but replacements are cheap enough to warrent a conservative philosophy.
 
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fjpikul

GT Owner
Mark IV Lifetime
Le Mans 2010 Supporter
Jan 4, 2006
11,083
Belleville, IL
Ralphie still has lead in his pants, too!
 

Mullet

FORD GT OWNER
Le Mans 2010 Supporter
Oct 21, 2008
2,464
Houston Texas
I change mine about every 200-400 miles. :)
 

paul b

GT Owner
Nov 2, 2006
810
I have a whipple and headers, I'm running 15Lbs. and had a misfire code and a bad misfire. I checked the plugs, they all looked good. I replaced them with NGK TR7IX iridium plugs and never had the problem again.
 

PL510*Jeff

Well-known member
Mark IV Lifetime
Le Mans 2010 Supporter
Nov 3, 2005
4,803
Renton, Washington
I change mine about every 200-400 miles. :)

Translated: Once a year
 

BlackICE

GT Owner
Nov 2, 2005
1,416
SF Bay Area in California
Translated: Once a year
For EP that would translate to never.