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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

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  #1  
Old 12-26-2010, 01:57 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 12-26-2010, 10:25 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:
Click the image to open in full size.


Took care of the problem!
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Old 12-26-2010, 10:38 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 12-26-2010, 10:53 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 12-26-2010, 11:55 AM
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Quote:
Originally Posted by timbersteel View Post
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 12-26-2010, 12:24 PM
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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 12-26-2010, 01:43 PM
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Quote:
Originally Posted by timbersteel View Post
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 12-26-2010, 02:27 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 12-28-2010, 09:18 AM
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Quote:
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 01-22-2011, 01:39 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 01-22-2011, 01:39 PM
 
 
 
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