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**This applies to all 3800 (3.8L) Series II & III v6 engines (including supercharged)

The plug firing order is 6-1-2-3-4-5

Rear 246 The 3.8L is an odd firing v6.

Front 135

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The 3100 (3.1L) v6 engine's firing order is 1-2-3-4-5-6

Rear 135 The 3.1L is an even firing v6.

Front 246

** I'm guessing you have the 3.8L Grand Prix. I only added the 3.1L because it was an engine used in some grand prix models.

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13y ago

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