'82 CHP Mustang 5.0 HO firing order

[Wolfe1013]

Thanks, Mike. Another "myth" dispelled about the '82 CHPs. I'm glad I looked and found that and didn't just take everything loose.

[ImEvil1]

Originally Posted by Wolfe1013

Thanks, Mike. Another "myth" dispelled about the '82 CHPs. I'm glad I looked and found that and didn't just take everything loose.

No prob (and I was messing with you a little). Everything I've ever seen refers to the 5.0 from '82 on as HO, it's just the firing order is different on the early cars? I will check the shop manuals for the '83 and '85 and see what they say. I know it changed at some point.

[ImEvil1]

Found it. Section 21-21-33 of the '82 shop manual says 13726548 (for Mustang and Capri only), which is the same as the "HO" 351. So, it's printed both ways in the same manual. The earlier reference came from 23-01-6, which is the section on ignition.

Learned something new. I'll still verify with the other manuals and my car, also, if you need it.

[Wolfe1013]

Originally Posted by ImEvil1

(and I was messing with you a little)

"Mr. Magee, please don't make me angry. You wouldn't like me when I'm angry."

Now, I'm so confused. Please, if you don't mind, anyone with an '82 CHP take a look at the firing order under your car's hood.

But how bad would it run if mine was wrong? It's been this way for quite some time, I would imagine. It sounded a little bit high on the idle as I haven't got it tuned for this elevation yet. But it passed emissions inspection with flying colors, as you'll recall. No stumbling, sputtering, etc.

Greg

[FoxChassis]

All '82-'86 Capri and '82-'95 Mustang 5.0L engines were "H.O." and all used the 1-3-7-2-6-5-4-8 firing order.

[ImEvil1]

Originally Posted by FoxChassis

All '82-'86 Capri and '82-'95 Mustang 5.0L engines were "H.O." and all used the 1-3-7-2-6-5-4-8 firing order.

Thanks for the pic, Fox. That's what's in the '82 shop manual (minus the color and 5.0 HO label on the bottom).

[Wolfe1013]

Thanks, guys. The thing with Chilton and Haynes, they show both HO and non-HO for the 1982 5.0L motor. I don't have that '82 shop manual, will have to look for it. I have one for the 351W HO Vic I've got, so I know their value.

With the engine work that's been done to my car, would it not run rough if it were wired incorrectly? I've driven it several times. I'm going to be changing out the battery cables and need to get the new belt on, so I haven't cranked it yet after the tune-up. I know it works with the non-HO firing order, so with no replies while I was under the hood, I wired it back up that way. Haven't got a chance to touch it since.

I guess my question is this: what reason would there be to have wired the motor up with the non-HO firing order. What would have been changed in the motor to require that, or is it just an oversight or confusion?

Thanks.

[FoxChassis]

The camshaft dictates the firing order. If your engine runs on the 154... firing order, either the camshaft has been changed out or the whole engine is from a vehicle that did not have a H.O. engine.

Not every 5.0L engine was H.O. From '82 through '86, only the Capri/Mustang 5.0L was H.O. The 5.0L engine in all of the rest Ford passengers cars in those model years was S.O.

S.O. = 15426378
H.O. = 13726548

[ImEvil1]

Originally Posted by Wolfe1013

"Mr. Magee, please don't make me angry. You wouldn't like me when I'm angry."

Now, I'm so confused. Please, if you don't mind, anyone with an '82 CHP take a look at the firing order under your car's hood.

But how bad would it run if mine was wrong? It's been this way for quite some time, I would imagine. It sounded a little bit high on the idle as I haven't got it tuned for this elevation yet. But it passed emissions inspection with flying colors, as you'll recall. No stumbling, sputtering, etc.

Greg

I read somewhere that it was changed to reduce bearing load, but who knows.

If Jim doesn't get out of his tree stand and beat me to it, I can get you a pic of mine tomorrow. I'd definitely go with the 137 order, though, based upon what I've now read.