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Spark Plug Wire Crossfire?

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Old Dec 26, 2010 | 12:57 AM
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Spark Plug Wire Crossfire?
I was just introduced to the Crossfire thing in another post I seen. I keep posting about a cold start issue but when it warms up it's fine. (I got the 5.0 V8 in a 92 F250 E4OD trans) It actually starts like it's missing a plug or something but it's tuned up completely with new wires, plugs, cap, rotor and coil. Now my question is this.... Even though I have BRAND NEW NAPA Spark Plug Wires could they still crossfire? I don't see any sparks when I open the hood in a pitch black area. Could the be crossfiring under the cap? If you wanna know all I've done and replaced you'll see it all on my previous post. But anyway I can guarantee My wires aren't routed right. I don't even think my separators exist haha! But if it is crossfire I don't know why it runs fine when warm. Thanks in advance (:
 
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Old Dec 26, 2010 | 09:25 AM
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I have the same problem with my 89 F250 302/aod under load it misses, drove me nuts trying to figure it out, finaly I found this:



Took care of the problem!
 
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Old Dec 26, 2010 | 09:38 AM
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Does anyone have the diagram for a '97 7.5l? I haven't seen it.

J
 
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Old Dec 26, 2010 | 09:53 AM
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this link may help if your firing order is different than one pictured above.

1983 Ford Bronco TSBs & FSAs (Recalls) for '83-96 Broncos & F150s picture | SuperMotors.net

Hope this helps everyone!
 
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Old Dec 26, 2010 | 10:55 AM
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Originally Posted by timbersteel
this link may help if your firing order is different than one pictured above.

1983 Ford Bronco TSBs & FSAs (Recalls) for '83-96 Broncos & F150s picture | SuperMotors.net

Hope this helps everyone!
I need the wire routing diagram for the '97 7.5. I'll do a search, but, while we're here, I also need it for a '78 6.6.

J
 
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Old Dec 26, 2010 | 11:24 AM
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Sorry J, didn't mean to sidetrack the Post. I posted the link for JV2290. I'll look around for the wiring diagram for the 78, 6.6
 
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Old Dec 26, 2010 | 12:43 PM
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Originally Posted by timbersteel
Sorry J, didn't mean to sidetrack the Post. I posted the link for JV2290. I'll look around for the wiring diagram for the 78, 6.6
No apology needed, I appreciate the help.

J
 
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Old Dec 26, 2010 | 01:27 PM
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Unfortunately that wasn't my issue. I routed them correctly but It still runs bad. Thanks for the info anyway! I still learened something haha
 
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Old Dec 28, 2010 | 08:18 AM
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I don't see any sparks when I open the hood in a pitch black area.
It's an inductive crossfire between 7 and 8 usually. Inductive means the current from one wire induces a voltage/current in the adjacent wire, so you won't see any arcs between the two wires.
 
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Old Jan 22, 2011 | 12:39 PM
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Apparently the firing order in that sticker (Eddiec's) is only true for 5.0 engines built from 1994 on. The firing order for older engines, like mine, is 1-5-4-2-6-3-7-8.
 
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Old Dec 16, 2019 | 07:44 AM
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I have the same problem with my 89 F250 302/aod under load it misses, drove me nuts trying to figure it out, finaly I found this:
Old thread, but Eddie was active yesterday.

Your post above reference a picture, but the link is dead.

What did you find?

Steve
 
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Old Dec 16, 2019 | 08:10 AM
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Originally Posted by Maillemaker
Old thread, but Eddie was active yesterday.

Your post above reference a picture, but the link is dead.

What did you find?

Steve

courtesy of Steve83
 
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Old Dec 16, 2019 | 08:25 AM
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Thanks. Is there something similar for a 1990 460 EFI engine?

Thanks,
Steve
 
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Old Dec 16, 2019 | 08:54 AM
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The 7.5L and early 5L engine share the same firing order. The diagram I posted will work for your application.
 
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Old Dec 16, 2019 | 09:11 AM
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Thanks. I am going to pick up some spark plug separators and see if it helps.

I've been struggling with an intermittent stumble/miss under load at top gear at 45 MPH.

Steve
 
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