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Stephan427SC 02-13-2014 01:39 AM
Firing Order Ford FE390 - need help !
 
Hi guys,

I have a Cobra with a Ford FE390 engine in my shop. The distributor is marked with numbers and if I believe these numbers ( clockwise ), the firing order is 1 5 4 3 7 2 6 8. Is this correct ?

I thought, that the correct firing-order for these
engines is 1 5 4 2 6 3 7 8....

Thanks,

Stephan

Ron61 02-13-2014 01:58 AM
Per my Ford FE Engine book all firing orders except for the 351s are what you gave above. Try to separate the 7 & 8 wires some as the high energy ignitions can cause an arch between them if one gets a weak place in the insulation.

I thought, that the correct firing-order for these
engines is 1 5 4 2 6 3 7 8....


However they can be wired to fire in a different order if you want to mess with it and I can see no really good reason to do so. The only ones that I ever saw that did that were on the 351s.

Ron

blykins 02-13-2014 03:52 AM
15426378, counter clockwise.

DanEC 02-13-2014 06:02 AM
Probably has a small block distributor cap on it.

Stephan427SC 02-13-2014 06:28 AM
Ok, I think I will go with 1 5 4 2 6 3 7 8.....

patrickt 02-13-2014 08:40 AM
Quote:
Originally Posted by Stephan427SC (Post 1285332)
Ok, I think I will go with 1 5 4 2 6 3 7 8.....
If you "rotate" the order around the cap a little bit it helps some on the 7 and 8 problem because the wires aren't tracking next to one another as much. You know it doesn't matter where the #1 plug actually is on the cap, provided you have the distributor in properly for it so that the overall timing is right. If you don't know what I'm talking about, then forget this post and just put wires in the location and order as stock from the factory.;)

jolsen42 02-13-2014 10:25 AM
Don't forget, it's COUNTER clockwise.

John O

jolsen42 02-13-2014 02:32 PM
They use the same cap, big & small block.

John O

Quote:
Originally Posted by DanEC (Post 1285325)
Probably has a small block distributor cap on it.

DanEC 02-14-2014 04:52 AM
Quote:
Originally Posted by jolsen42 (Post 1285407)
They use the same cap, big & small block.

John O
That was sort of my point. Since some of the small blocks run a different firing order maybe he found a odd one molded with the 1 5 4 3 7 2 6 8 order on it and marketed as specific for small block applications. A Chinese special possibly. %/

DesertMK4 02-14-2014 12:54 PM
Firing order
 
The firing order is determined by the cam not the block (small or large). HO Ford engines (usually 302s) have their own firing order. The cap makes no difference in the firing order, unless it only has seven leads.:LOL:

jolsen42 02-14-2014 01:39 PM
That is soo true.:D All ford distributors from 57-73 use the same cap with just #1 molded on. Firing order is determined by the cam.

John O

Quote:
Originally Posted by DesertMK4 (Post 1285562)
The firing order is determined by the cam not the block (small or large). HO Ford engines (usually 302s) have their own firing order. The cap makes no difference in the firing order, unless it only has seven leads.:LOL:

DanEC 02-14-2014 04:15 PM
Quote:
Originally Posted by DesertMK4 (Post 1285562)
The firing order is determined by the cam not the block (small or large). HO Ford engines (usually 302s) have their own firing order. The cap makes no difference in the firing order, unless it only has seven leads.:LOL:
Well, it might improperly - if the cap has a SB firing order molded into it (as the OP said his has) and someone not knowing any better tries to wire his FE to match it. I don't see where anyone alleged that the engine's proper firing order is established by the cap.:confused:

jolsen42 02-14-2014 04:57 PM
Quote:
Originally Posted by DanEC (Post 1285586)
Well, it might improperly - if the cap has a SB firing order molded into it (as the OP said his has) and someone not knowing any better tries to wire his FE to match it. I don't see where anyone alleged that the engine's proper firing order is established by the cap.:confused:
You did. :D

Quote:
Originally Posted by DanEC (Post 1285325)
Probably has a small block distributor cap on it.
There is no small block specific dist.cap. They are all the same. The op never said the firing order was molded into the cap. He said it was marked. I would think most likely with a sharpie. Anyway, I think we've sufficiently covered this. :D

John O

DanEC 02-15-2014 06:39 AM
I took his post to mean it was an odd-ball cap with molded in terminal numbers - I probably misunderstood since he actually said distributor was marked.

mrmustang 02-15-2014 06:57 AM
Quote:
Originally Posted by Stephan427SC (Post 1285332)
Ok, I think I will go with 1 5 4 2 6 3 7 8.....

Did it work for you?

if not, three things come to mind:

1: Your distributor is off a tooth or two and/or is not indexed correctly
2: You are not setting up your plugs based on proper #1 location on the distributor cap.
3: You are not wiring them up in the proper engine rotation.

http://ww2.justanswer.com/uploads/s4...ring_order.jpg


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