Plugs being gapped at .045 instead of .054 killing performance?

xspeed02 · 05-15-2001, 08:38 PM

A while back I tuned up my car and the parts guy said either the gap was .045 or .054... Anyways, all of you said it was .054 but we put it at .045 since the gap of the plugs we pulled was .048... now, do you think this is possibly killing performance? And if so would it even be noticeable?

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Team Xspeed Leader/Co-Founder
1990 Black Mustang GT 5spd
Current Mods: 2 1/2 Offroad H-Pipe, Borla Cat-Back Exhaust, 91-93 5 Star Pony Wheels, K&N Filter, Free Mods, Pioneer Headunit, MB Quartz Speakers, Orion Xtreme 300 Amp, 2 JL Audio W0's, 130 Amp Alternator, 3.73's, Steeda Tri-Ax Shifter
Future Mods: Engine rebuild with Trickflow Heads, GT-40 Intake, Custom Ground Cam, and 14lb ATI Procharger!
AIM=xspeed02

blueneonman1 · 05-15-2001, 11:07 PM

Let me tell you from experience that Ford calls for .052 on the 5.0 HO motor. I recently did "green94droptop"'s plug, cap/rotor, and wires. He was gapped at .080!!! He just got the car so the previous owner must have been a _jackass. But he told me before I did the plug change that his car had bad throttle response and seemed like it missfired at idle. Now, those problems are gone.

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Blueneonman - '95 5.0L Mustang GT Convertible | K&N Custom Cold Air Intake | FMS 9mm Wires | Hollow Cats | Flowmaster 2 Chambers | BBK Subframes | 6-pt Rollcage | 14deg Timing | King Cobra Clutch | FMS Adjustable Clutch Cable | Coolest Neon Lighting on a Mustang EVER!

Homepage: http://www16.brinkster.com/blueneonman/

Best time: 14.578 @96.20mph

xspeed02 · 05-15-2001, 11:10 PM

Hmm, I think I may regap the plugs soon then. I'm not having a misfire or anything like that... but I should probably go ahead and regap em anyways. Thanks for the info.

------------------
Team Xspeed Leader/Co-Founder
1990 Black Mustang GT 5spd
Current Mods: 2 1/2 Offroad H-Pipe, Borla Cat-Back Exhaust, 91-93 5 Star Pony Wheels, K&N Filter, Free Mods, Pioneer Headunit, MB Quartz Speakers, Orion Xtreme 300 Amp, 2 JL Audio W0's, 130 Amp Alternator, 3.73's, Steeda Tri-Ax Shifter
Future Mods: Engine rebuild with Trickflow Heads, GT-40 Intake, Custom Ground Cam, and 14lb ATI Procharger!
AIM=xspeed02

05-15-2001, 08:38 PM	#1
xspeed02 Registered Member Join Date: Nov 1998 Location: Kettering, Ohio Posts: 119	Plugs being gapped at .045 instead of .054 killing performance? A while back I tuned up my car and the parts guy said either the gap was .045 or .054... Anyways, all of you said it was .054 but we put it at .045 since the gap of the plugs we pulled was .048... now, do you think this is possibly killing performance? And if so would it even be noticeable? ------------------ Team Xspeed Leader/Co-Founder 1990 Black Mustang GT 5spd Current Mods: 2 1/2 Offroad H-Pipe, Borla Cat-Back Exhaust, 91-93 5 Star Pony Wheels, K&N Filter, Free Mods, Pioneer Headunit, MB Quartz Speakers, Orion Xtreme 300 Amp, 2 JL Audio W0's, 130 Amp Alternator, 3.73's, Steeda Tri-Ax Shifter Future Mods: Engine rebuild with Trickflow Heads, GT-40 Intake, Custom Ground Cam, and 14lb ATI Procharger! AIM=xspeed02

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05-15-2001, 11:07 PM	#2
blueneonman1 Registered Member Join Date: Mar 2001 Location: Palm Harbor, FL Posts: 208	Let me tell you from experience that Ford calls for .052 on the 5.0 HO motor. I recently did "green94droptop"'s plug, cap/rotor, and wires. He was gapped at .080!!! He just got the car so the previous owner must have been a _jackass. But he told me before I did the plug change that his car had bad throttle response and seemed like it missfired at idle. Now, those problems are gone. ------------------ Blueneonman - '95 5.0L Mustang GT Convertible \| K&N Custom Cold Air Intake \| FMS 9mm Wires \| Hollow Cats \| Flowmaster 2 Chambers \| BBK Subframes \| 6-pt Rollcage \| 14deg Timing \| King Cobra Clutch \| FMS Adjustable Clutch Cable \| Coolest Neon Lighting on a Mustang EVER! Homepage: http://www16.brinkster.com/blueneonman/ Best time: 14.578 @96.20mph

05-15-2001, 11:10 PM	#3
xspeed02 Registered Member Join Date: Nov 1998 Location: Kettering, Ohio Posts: 119	Hmm, I think I may regap the plugs soon then. I'm not having a misfire or anything like that... but I should probably go ahead and regap em anyways. Thanks for the info. ------------------ Team Xspeed Leader/Co-Founder 1990 Black Mustang GT 5spd Current Mods: 2 1/2 Offroad H-Pipe, Borla Cat-Back Exhaust, 91-93 5 Star Pony Wheels, K&N Filter, Free Mods, Pioneer Headunit, MB Quartz Speakers, Orion Xtreme 300 Amp, 2 JL Audio W0's, 130 Amp Alternator, 3.73's, Steeda Tri-Ax Shifter Future Mods: Engine rebuild with Trickflow Heads, GT-40 Intake, Custom Ground Cam, and 14lb ATI Procharger! AIM=xspeed02