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Missing and running rich

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Old Jun 2, 2024 | 06:32 PM
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Missing and running rich
I have a 1992 f150 and I just put a 1994 5.0 in it with all 92 electronics and it’s running rich and runs rough like it’s missing. I’m about to put new plugs and see if that helps but I’ve put new injectors in, plug wires, plugs, new vacuum lines, EGR and EGR position sensor. The two cylinders that seem to be the problem are 5 and 7.

I got it all figured out it was the firing order. Once I switched it over it ran great!
 
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Old Jun 2, 2024 | 08:19 PM
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What spark plug wire routing and firing order did you use?



 
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Old Jun 2, 2024 | 08:34 PM
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Originally Posted by My4Fordtrucks
What spark plug wire routing and firing order did you use?


I just used the same firing order and I used the routing pretty close to that picture I just didn’t have the clips for the wires anymore.
 
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Old Jun 2, 2024 | 08:41 PM
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Originally Posted by My4Fordtrucks
What



spark plug wire routing and firing order did you use?


That’s what my distributor looks like
 
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Old Jun 2, 2024 | 09:44 PM
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Originally Posted by Gustheobsford
I just used the same firing order….
I cannot read the numbers on the wires. The ‘92 firing order or the ‘94 order?
 
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Old Jun 2, 2024 | 09:55 PM
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When's the last time the O2 sensor has been replaced?
 
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Old Jun 2, 2024 | 10:02 PM
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Originally Posted by My4Fordtrucks
I cannot read the numbers on the wires. The ‘92 firing order or the ‘94 order?
I went off the 92 firing order
 
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Old Jun 2, 2024 | 10:03 PM
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Originally Posted by Junktownbill99
When's the last time the O2 sensor has been replaced?
I’m not sure I know I haven’t ever replaced it
 
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Old Jun 3, 2024 | 06:29 AM
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Originally Posted by Gustheobsford
I went off the 92 firing order
That is the wrong firing order for a ‘94 engine. Did you look at the TSB I posted?



 
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Old Jun 3, 2024 | 06:33 AM
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I had a misfire on mine when I did the plugs and wires BEFORE I put the wire clips on to keep the closely firing wires apart from one another.
 
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Old Jun 3, 2024 | 08:32 AM
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Originally Posted by My4Fordtrucks
That is the wrong firing order for a ‘94 engine. Did you look at the TSB I posted?

I’ll switch it over later today
 
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Old Jun 3, 2024 | 08:33 AM
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Originally Posted by mackendw
I had a misfire on mine when I did the plugs and wires BEFORE I put the wire clips on to keep the closely firing wires apart from one another.
how was that causing it the misfire? Just curious
 
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Old Jun 4, 2024 | 02:31 PM
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Originally Posted by Gustheobsford
how was that causing it the misfire? Just curious
High voltage likes to jump.

Basically another wire is stealing the spark.
 
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Old Jun 4, 2024 | 05:50 PM
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Originally Posted by Junktownbill99
High voltage likes to jump.

Basically another wire is stealing the spark.
that could be a option I’ll check that
 
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Old Jun 5, 2024 | 08:05 AM
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From: New Dominion, PE
Originally Posted by Gustheobsford
that could be a option I’ll check that
fire the truck up after dark and open the hook and look at the plug wires. if it's jumping, you'll see the spark moving
from wire to wire.
 
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