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.


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

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!

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Best time: 14.578 @96.20mph

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

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.

Yes..the stock gap is .054

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