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Not sure if 91 is the same as later models but the firing order on later Wranglers is 153624 it may be stamped on top of intake manifold.

All Inline 6 Cyl Engines Are 153624, no matter what year or who made it.

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7y ago
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15y ago

The firing order should be 1-5-3-6-2-4.

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15y ago

1-5-3-6-2-4

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Q: What is the firing order for a 1991 Jeep Wrangler 4.0L?
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