Hey guys,

Just as the title states i need the firing order.. Did they only put HO's in these or did they come with standard 302's as well??

Thanks alot

 

1-3-7-2-6-5-4-8; distributor rotates counter clockwise. As far as I know, they're all HO engines.

 

You'd better check that. THere are two distictly different firing orders, and they were used somewhat in random. The 302 also used the 351 firing order on some makes and models.

1-3-7-2-6-5-4-8 5.0 HO
1-5-4-2-6-3-7-8 Base 5.0

 

The two different firing orders I believe coincide with either one throttle body or two. Ford made a limited number of the 5.0 engines with two throttle bodies as an experiment. Isn't it fun trying to replace plugs 4 and 8 LOL...
-(New member new '95 150 owner. I love mine so far!)

 

SAY WHAT?? Twin tb?

 

you also have to watch the plug wire routing on 7 and 8. they can not run side by side or the could induse a spark and cause predetionation and wost case break a piston. We have seen this at my shop. there are tsb's for this

 

Unless otherwise specified on the underhood decal, all 1995 Light Duty trucks with a 5.0L used the 1-3-7-2-6-5-4-8 firing order.

This is an excellent point, but it applies more to the older firing order (1-5-4-2-6-3-7-8). With the current firing order, you need to keep the wires going to cylinders 6 & 5 completely separated. Any time you have sequentially fired cylinders next to each other on the same bank, you risk creating a missfire if the wires contact each other.

 

I thought they put the HO in the mustang 5.0 because it had highflow exhuast headers and a performance cam?
i could be wrong though

 

There were lots of differences between the H.O. 5.0L and the non-H.O. 5.0L engines over the years. The H.O. 5.0L was used in several Ford vehicles, not just Mustangs.

 

Maybe this will help...

Ford 5.0L V8 Firing Orders

1-5-4-2-6-3-7-8 was used in:

* 1979 and earlier 5.0L V8's
* 1979-1993 truck 5.0L V8's
* Base (non-H.O.) passenger car 5.0L V8's
* 1980-1982 4.2L V8's


1-3-7-2-6-5-4-8 was used in:

* 1982 and later H.O. & GT-40 5.0L V8's
* 1994 and later truck 5.0L V8's
* 5.8L V8's
* 460ci V8's