problem
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Senior User
Joined: Jun 2006
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problem
my truck is making a making a poping sound (backfire?) and it sounds like its coming from the exhaust, it ran fine when i drove it to my dads shop for an oil change. i changed plug wires while i was out there. It has no power what so ever, bad plug wires? Did i not get one of them on all the way or is it something else.
thanks, chris
87 F150 302 4x4 A4OD
thanks, chris
87 F150 302 4x4 A4OD
Lead Driver
Joined: Feb 2000
Posts: 5,374
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From: Palm Bay, Florida
If your truck was running fine before you changed your plug wires then you most likely did not install the new ones in the same position (to the correct fireing order) as the old ones were in. You need to check your fireing order and the position of your wires.
Postmaster
Joined: Jul 2006
Posts: 3,978
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From: Central PA
Sounds like wires crossed to me. Check firing order . I tried to use 351 order on a 80's 302 .
A fart had more power. Hey please keep us posted . There are alot of excellent wrench guru's here. Good luck 
_____________________________
94 F150 XLT 4x4 SC Long bed Maf 302 E4Od
A fart had more power. Hey please keep us posted . There are alot of excellent wrench guru's here. Good luck _____________________________
94 F150 XLT 4x4 SC Long bed Maf 302 E4Od
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From: youngstown ohio
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Post Fiend
Joined: May 2004
Posts: 11,289
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From: Lakewood, Ohio
sorry, i gave the firing order for 94 on.
the firing sequence on 1987-93 engines is 1-5-4-2-6-3-7-8. Because cylinders 4/2 and 7/8 fire in sequence, they're the ones to keep an eye on. In 1994, Ford changed the firing order on the 5.0 to 1-3-7-2-6-5-4-8. Here, you'd look for problems with ganged cylinders 1/3 and 6/5.
the firing sequence on 1987-93 engines is 1-5-4-2-6-3-7-8. Because cylinders 4/2 and 7/8 fire in sequence, they're the ones to keep an eye on. In 1994, Ford changed the firing order on the 5.0 to 1-3-7-2-6-5-4-8. Here, you'd look for problems with ganged cylinders 1/3 and 6/5.
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From: Chickasha, Ok
You know this is a little off subject but I had an old guy bring his car into my shop because he couldn't get the ignition timing right after putting new plug wires on his 88 302 LTD. He informed me that I was hooking my timing light up to the wrong cylinder, he said I was on cyl #2, #1 is over here on the left side. He was dead serious. It turns out that he thought the firing order was the same as a chevy. He actually wired it that way and it ran hitting on all 8. To my amagement every plug wire was advanced one hole in the cap but they were in the right order. So it seems that if you renumbered the 302 ford cylinders like a chevy the chevy firing sequence is the same. What a mind blower !!