What is the firing order for an inline 6 in a 1990 Jeep Wrangler?
The 1990 Jeep Wrangler did *not* use an inline-6 engine. The standard engine in that year was the 4.2L straight-6 (a different engine than the inline-6 you're likely thinking of in other vehicles). However, even the 4.2L is technically an inline-6, and its firing order is 1-5-3-6-2-4.