92 302 ?
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Postmaster
Joined: Sep 2004
Posts: 3,166
Likes: 2
From: wi
92 302 ?
in my truck(92 in sig) has 12000 miles on the ford reman now and if had to replace #7 spark plug 4 times already.all the rest look good to mabe a lil lean #7 gets crudded up and quits fireing.this seems to only happen when im pullin a trailer.well it happend the other day again and i was mad so i just beet the crap out of it and didnt care if it blew heck got a 30000 mile warrenty.any way the miss was gone it runni ok again.my ? is why does it do this or are you spose to drive injected vehicles a lil more agressive.oh buy the way the ford shop sent the injectors in to get'em checked all were fine
Freshman User
Joined: May 2006
Posts: 46
Likes: 0
From: Crowley, TX
If the injectors are all good, then I would check the wiring. You could have a short that's causing that injector to stay open. If I'm not mistaken, the negative(ground) wire to the injector is triggered by the computer to fire the injector. If that wire is grounded at any point, the injector will stay open. Also, to make it more complicated, it could be an intermittent short. That would make it much harder to track down.
Also, check your compression. Maybe that cylinder is allowing oil past the rings.
Also, check your compression. Maybe that cylinder is allowing oil past the rings.
Elder User
Joined: Mar 2004
Posts: 580
Likes: 0
From: Chippewa Falls, WI
Could it just be that #7 has a bad ignition wire that isn't leting the plug get a full amount of juice? That really wouldn't explaine why it only seems to do it when pulling something, but it is all I can think of, other than some sort of compression/valve/injector problem with that particular one.
Just a thought!
Just a thought!
Elder User
Joined: Jun 2006
Posts: 805
Likes: 3
There is a service advisory, and it's a good idea to follow it to the letter. Make absolutely sure that you route #7 and #8 wires with #5 and #6 between them as long as you possibly can. When #6 comes out to turn down for that plug, turn #7 up, and cross #8 at right angle only. DO NOT LET #7 and #8 parallel on your '92 5.0L. I guarantee you from experience you will have all sorts of pinging and fouling problems, regardless of the condition of your wires. The same applies for #4 and #2 cylinders, but they sorta stay separated anyway. It's a weird problem on the 5.0's with the 15426378 firing order, which is what your '92 should have.
In addition, you didn't mention what brand plugs you were using. If they ain't Motorcraft like it says on the sticker under the hood, go get some. Don't doubt the sticker. I learned that lesson the hard way. #8 cylinder ate a Bosch Platinum II No-Gap plug, and I constantly had a slight but noticeable miss, and poor performance on plugs with less than 10,000 miles. Popped the Motorcraft plugs back in, and VOILA! She runs like a top now. Plenty o' grunt, and feels more like an electic motor out there than an internal combustion engine. VERY smoooooth now.
In addition, you didn't mention what brand plugs you were using. If they ain't Motorcraft like it says on the sticker under the hood, go get some. Don't doubt the sticker. I learned that lesson the hard way. #8 cylinder ate a Bosch Platinum II No-Gap plug, and I constantly had a slight but noticeable miss, and poor performance on plugs with less than 10,000 miles. Popped the Motorcraft plugs back in, and VOILA! She runs like a top now. Plenty o' grunt, and feels more like an electic motor out there than an internal combustion engine. VERY smoooooth now.
