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  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
  • Fox 5.0 Mustang Tech

spark plug gap ?

  • Thread starter Thread starter feifong
  • Start date Start date May 30, 2006

feifong

New Member
Apr 4, 2005
319
0
0
mesa
May 30, 2006
#1
  • May 30, 2006
  • #1
what is the gap on plugs i have afr 165's and im using autolites. Is the gap 44 i pulled a plug out and it was at .030 what happens to the car when the gap is wrong?
 

Tonys96Cobra

professional deer "mounter"
Oct 28, 2005
19
9
29
Syracuse
May 30, 2006
#2
  • May 30, 2006
  • #2
Factory gap is .054
 

HISSIN50

"How long does it take to get help in here?
15 Year Member
Nov 29, 1999
31,179
33
129
May 31, 2006
#3
  • May 31, 2006
  • #3
If the gap is too large, one can see high RPM missing.
If too small, it can leave some performance on the table.
 
T

Treachery

Founding Member
Jun 9, 2002
148
0
17
May 31, 2006
#4
  • May 31, 2006
  • #4
A symptom of too large of a gap is sudden power loss at high rpm's. The spark gets blown out, like blowing out a candle. Proper gapping also depends on what modifications you have, if any.

I had my Autolites gapped at .035 and they kept blowing out when i was getting dyno'd (many engine mods). No one knew why. 3 mechanics/tuners couldn't figure it out. Then someone in this forum suggested decreasing the gap - hallelujah!
 

feifong

New Member
Apr 4, 2005
319
0
0
mesa
May 31, 2006
#5
  • May 31, 2006
  • #5
the end of my plugs are white what is this too lean?
 
J

jjd975

Founding Member
Jul 17, 2000
4,236
0
0
louisville,kentucky
May 31, 2006
#6
  • May 31, 2006
  • #6
White is lean. I run .050 gap
 
D

DABEAN212

New Member
May 8, 2003
10
0
0
Georgia
Jun 21, 2006
#7
  • Jun 21, 2006
  • #7
Treachery said:
A symptom of too large of a gap is sudden power loss at high rpm's. The spark gets blown out, like blowing out a candle. Proper gapping also depends on what modifications you have, if any.

I had my Autolites gapped at .035 and they kept blowing out when i was getting dyno'd (many engine mods). No one knew why. 3 mechanics/tuners couldn't figure it out. Then someone in this forum suggested decreasing the gap - hallelujah!
Click to expand...

So this could be why my car starts misfiring bad at around 4500 rpms? I couldnt get a good pull on my dyno tune because of this problem and the only thing they said to do was change the plugs. I will put my new plugs at .030 then...thanks!!!
 

Strype

Cuthbert catcher
Founding Member
May 11, 1999
61
34
104
Huntsvegas, AL
Jun 21, 2006
#8
  • Jun 21, 2006
  • #8
Tonys89GT said:
Factory gap is .054
Click to expand...

For 91-93 .054

For 90 down it's .044
 
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