Need help
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Joined: Jun 2012
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Need help
I have a 1979 ford f-150 302 v8 with 31,000 auto. im having problems with rough idle and it stalling while at idle. The truck ran fine till i put new plugs and wire in. Yesterday i put the plugs and wire in and it ran rough. the plugs where gaped right, but when i pulled the plug wires to see if i could find out anything. The passenger back two plug wires had not changed engine idle at all but others did. it has spark fro wire to plug. recently i have changed plugs,wires, cap, rotor, accel pump, coil, fuel filter, air filer. and egr valve but its a used one the old one that was in it was not holing pressure and the used on i got is smaller but fits and it holds vacuum. thanks for any help!
MSEE
Joined: Apr 2004
Posts: 10,386
Likes: 35
From: Austin, TX
Make sure the EGR valve isn't stuck open at idle; otherwise move on for now. If plugs and one wire are literally the only things that changed between it running fine and running poorly, check the resistance of the wire in question. What did you gap the plugs at?
Lead Driver
Joined: Mar 2004
Posts: 8,922
Likes: 152
If it ran fine before you changed the plugs and wires then you probably got bad wires or bad plugs, my bet is the plugs. Put it back the way it was and see what happens. What kind of plugs ? I only use Motor-Craft plugs. I've had Champion dead right out of the box, AC, and Autolite as well are all junk.
Hotshot
Joined: Apr 2009
Posts: 14,333
Likes: 247
From: Stanley, VA
Be sure the firing order is right and you didn't switch the two wires on the passenger side, the ones that didn't change the idle.
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Post Fiend
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I think Mike is right. You've got some plug wires on wrong, otherwise the engine would run differently when you unplug one.
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