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firing order

36K views 6 replies 3 participants last post by  artstang 
#1 ·
Does anyone know the firing order for an 89 Mustang with a 302 HO? I`ve been told that i might not have the firing order right on it. It has a miss or back fire going on right now and doesn`t sound as good as it did before i rebuilt it. Just wondering if it`s wrong.
 
#3 ·
Thanks Jwko, thats the firing order that my Haynes manual has in it. It showes it for the 351m,351w,and the 400. Question is,is it at 12 degree BTDC or at TDC ? The pistons were 1-5-2-6-3-7-4-8 when I took them out or would that make any difference? Either way I`m going to wire it as the way your diagram showed it. Thanks for the info. I`ll let you know what happens. Thanks Mike
 
#7 ·
gameshooter, there are roller cams that are made for non roller engines who wants to upgrade their mill to a roller setup. In your case, a complete 1989 5.0 HO firing order should be 1 3 7 2 6 5 4 8 as JWKO says. Just make sure the cam you installed is for that firing order.

255, 260,289, 302 EXC HO,
352, 360, 390, 410, 427, 428,
429, 430, 460, 462 is
Firing Order: 1-5-4-2-6-3-7-8



302 (5.0L) HO & 95-96 Truck,
351C, 351M, 351W, 400 is

Firing Order: 1-3-7-2-6-5-4-8
 
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