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The 3.1 liter engine is actually a V6, not a 4cyl. It's NOT the same multiport injected 3.1 found on other cars like the Corsica, Lumina, etc of this generation because it actually uses a distributor and has throttle body injection and not multiport injection. It's pretty old school. Anyway, the firing order is just straight 1-2-3-4-5-6 and the distributor rotates clockwise.

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18y ago
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Q: What is the firing order for a 1990 Pontiac Transport 3.lL 4 cylinder?
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