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Unread 07-16-2007   #1 (permalink)
BadlandsGhost is offline Made Member

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Default 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?

Thanks
J
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Unread 07-16-2007   #2 (permalink)
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Definately do the fuel filter.

Have you checked your timing with a light yet? Could possibly be a loose clamp and you may be running to much timing.

How many tanks of gas have you went through with this problem? Could be bad gas.

Also it might be the TFI module.
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Unread 07-17-2007   #3 (permalink)
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Well, the filter overdue anyway, just had other things going on, (seems like every month something new breaks, LOL)

Haven't checked the timing in a few months, will do, and the tfi is only like 2 years old, but who knows.
I'm fairly certain its not bad gas, we've gone through several tanks, from various places.

Also, to amend previous post: in addition to doing the popping when cold, it also would kinda drag for about 30 secs after a stop and restart (ie. gas station, store etc) I noticed it do that again this morning on the way home.

anything else I'm missing?

Thanks
J
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Unread 07-19-2007   #4 (permalink)
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maybe an egr or o2 sensor problem. my 90 gt will make a pop noise between shifts when cold as you go through the gears for the first time and run the rpms around 3,000 which I try not to do to often when the car is cold. But after the first time through the gears the car must warm up enough causing the fuel and air to be metered more efficiently and the engine does not do it after this. I think that your pop sound and mine are not related.
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Unread 07-19-2007   #5 (permalink)
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I also agree with kyle f to check the filter first.
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Unread 05-19-2010   #6 (permalink)
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BadlandsGhost,

I know this is an extremely old post, but your description of your car's problem is almost identical to what my car is doing now. Did you ever fix it? What was wrong with it?

Thanks man!
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Unread 05-19-2010   #7 (permalink)
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Check your firing order, I drove my car once with plug wires 2 and 3 switched and it did exactly what you described.

http://www.allfordmustangs.com/forum...gorder-5.0.jpg
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Unread 05-19-2010   #8 (permalink)
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Thanks, agunner. I already checked my firing order (I think I even used the same diagram you provided for me! ahhaha)

Anyway, I am pretty sure it is right after checking it a week ago. I will definitely check it again though...you can never be too sure! (that's what us OCD'ers say :laughlitt)
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Unread 05-20-2010   #9 (permalink)
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Quote:
Originally Posted by jdfreeman820 View Post
Thanks, agunner. I already checked my firing order (I think I even used the same diagram you provided for me! ahhaha)

Anyway, I am pretty sure it is right after checking it a week ago. I will definitely check it again though...you can never be too sure! (that's what us OCD'ers say :laughlitt)
my car did same thing a while back it was a bad TPS sensor. throttle position sensor. only $40 autozone.
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