lower idle after plug change???

lx mike · 06-06-2001, 05:29 PM

I changed my plugs (#4 was a b****) and i started it up and went inside to get cleaned up and when i came out it was idleing lower than it usualy does after warming up. i took for a drive and feels better S.O.T.P and when i got home i checked idle and was around 800 when before it would be around 900-950 when warm. whoever did last plug change used ngk platinums and gap was close to .060. I used autolites gapped at .054.

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93-LX: 5 Speed, Flow's with H-Pipe, 3.73's Sub's and K&N.

blueneonman1 · 06-06-2001, 10:41 PM

900-950 rpm idle sounds too high. Mine idles around 600-700. I think thats normal range anyway.

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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 | 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

92FiveOh · 06-06-2001, 10:47 PM

Changing gap can effect idle quality quite a lot. Regardless, your prev idle actually sounds too high, as mentioned by blueneonman1.

Are the new Autolites coppers or plats? If they're coppers, I wouldn't have dropped the gap, as they have *a bit* less resistance than plats. Dropping gap too much can make things get bumpy.

HTH, Larry
'92 5.0 ; Paxton SC

lx mike · 06-07-2001, 07:23 AM

just the regular copper autolites gapped at .054 thats stock gap isn't it?

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93-LX: 5 Speed, Flow's with H-Pipe, 3.73's Sub's and K&N.

Smokedawg · 06-07-2001, 10:17 AM

Yes..the stock gap is .054

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347 Stroker Motor: Balanced, Cobra Transmission, Extrude Ported and Polished Upper and ported Lower, GT40 Milled Ported and Polished Heads, B303 Cam, BBK 1 5/8 Headers, 30lb Bosch Injectors, Holley AFPR, March Underdrive Pulleys, Perma-Cool Fan, 3-Core Radiator, Accel Performance Coil, Accel 300+ Racing Wires, Ram Air, K&N Filter, 73mm Vortech MAF, 70mm TB, FlowMaster Exhaust w/BBK Offroad H-Pipe, Hurst Shifter, 3:55 Gears, Ram Clutch, Cross Drilled Rotors, AC del, rear seat del.

06-06-2001, 05:29 PM	#1
lx mike Undescribable Join Date: Sep 1998 Location: Ft Myers Fla Posts: 1,539	lower idle after plug change??? I changed my plugs (#4 was a b****) and i started it up and went inside to get cleaned up and when i came out it was idleing lower than it usualy does after warming up. i took for a drive and feels better S.O.T.P and when i got home i checked idle and was around 800 when before it would be around 900-950 when warm. whoever did last plug change used ngk platinums and gap was close to .060. I used autolites gapped at .054. ------------------ 93-LX: 5 Speed, Flow's with H-Pipe, 3.73's Sub's and K&N.

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06-06-2001, 10:41 PM	#2
blueneonman1 Registered Member Join Date: Mar 2001 Location: Palm Harbor, FL Posts: 208	900-950 rpm idle sounds too high. Mine idles around 600-700. I think thats normal range anyway. ------------------ 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 \| 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

06-06-2001, 10:47 PM	#3
92FiveOh Registered Member Join Date: Jun 2001 Location: Irvine, CA, USA Posts: 7	Changing gap can effect idle quality quite a lot. Regardless, your prev idle actually sounds too high, as mentioned by blueneonman1. Are the new Autolites coppers or plats? If they're coppers, I wouldn't have dropped the gap, as they have a bit less resistance than plats. Dropping gap too much can make things get bumpy. HTH, Larry '92 5.0 ; Paxton SC

06-07-2001, 07:23 AM	#4
lx mike Undescribable Join Date: Sep 1998 Location: Ft Myers Fla Posts: 1,539	just the regular copper autolites gapped at .054 thats stock gap isn't it? ------------------ 93-LX: 5 Speed, Flow's with H-Pipe, 3.73's Sub's and K&N.

06-07-2001, 10:17 AM	#5
Smokedawg Tires Fear Me... Join Date: Jan 2001 Posts: 867	Yes..the stock gap is .054 ------------------ 347 Stroker Motor: Balanced, Cobra Transmission, Extrude Ported and Polished Upper and ported Lower, GT40 Milled Ported and Polished Heads, B303 Cam, BBK 1 5/8 Headers, 30lb Bosch Injectors, Holley AFPR, March Underdrive Pulleys, Perma-Cool Fan, 3-Core Radiator, Accel Performance Coil, Accel 300+ Racing Wires, Ram Air, K&N Filter, 73mm Vortech MAF, 70mm TB, FlowMaster Exhaust w/BBK Offroad H-Pipe, Hurst Shifter, 3:55 Gears, Ram Clutch, Cross Drilled Rotors, AC del, rear seat del.