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Confusion over Spark plug gap

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Old 18 Jan 2010, 07:34 pm
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Default Confusion over Spark plug gap


Read in this forum that there was a bulletin for 2004 and before, non turbo engines recommending the gap for plugs be set at 0.40

Next up for me is to change the plugs and wires on my 2005 GT convertible HO 2.4L Turbo engine. Already ordered NGK plugs and a new wire set, but want to know what gap should I set the plugs at.

The dealer and store told me to gap the plugs at 0.50, but seems others here have set their gaps to 0.40 or less.

What I want to know is: what is the best gap you have used for your 05 GT HO engine to recommend?


Last edited by mixedplate; 18 Jan 2010 at 10:45 pm.
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Old 18 Jan 2010, 08:13 pm
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Default Re: Confusion over Spark plug gap

The dealer is way off. There was a TSB for gap (non-turbo engines) that said to gap at 0.040 - but many feel it should be even less for the turbo - some with Stage 1 go down to 0.028, but I compromised on mine and went to 0.038 and it's been fine for many thousands of miles.
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Old 23 Jan 2010, 06:01 pm
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Default Re: Confusion over Spark plug gap

Thanks quicksilverdon for your replies and help.

You da man!!
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Old 24 Jan 2010, 07:56 am
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Default Re: Confusion over Spark plug gap

.040 is perfect along with NGK 4306 copper clad plugs. I run the same plugs and gap in my GT and my 12 second SRT. Platinum plugs are not recomended.
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Old 24 Jan 2010, 06:12 pm
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Thumbs up Re: Confusion over Spark plug gap

Thanks for the info flakdodger. It's funny that those are the exact same plugs I ended up purchasing and also gapping them at 0.40

I purchased the plugs from NAPA.

My GT runs great now!!
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