Joined: Apr 2004
Location: Pigeon Forge
1993 Mustang 5.0 backfire under WOT
Under normal conditions, the car dirves fine, but any time its floored, the car backfires and pops until you come off the gas. Heres the specifics:
93 5.0, motors stock, 170k.
You can hold a gear to whatever rpm, as long as you ease into it. Any stabs however will start to car to popping and shuddering.
The lower the rpm when floored, the worse the backfire,
It starts within a couple of hundred rpm from when you go to WOT.
It also will pop a little on load after a cold start, but hasn't done that since I started troubleshooting on it this weekend.
So far I've checked the plugs for any sign of misfire, wires for cross fire. Cap and rotor are ok, will probibly replace anyway.
Found one small vaccum cap that was dried out and cracked, replaced that. Cleaned TB, it was pretty rank. Basically a mini-tune up.
Next things I'll be checking, fuel filter, see if theres any codes, Any other ideas?
You are what you do when it counts
'93 GT, AKA Fawkes, basically stock (as far as you know)
'66 Mustang Coupe-AKA "Lenore"
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