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Old 03-15-2015, 01:16 PM   #1
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Backfire help

As of just a couple days ago I noticed my Stang wasn't running right, it was sluggish and didn't sound smooth when I would get on it. As of yesterday it started to backfire when I'd let the gas out and the RPMs start to drop. I checked all the coils, all the spark plugs, for any vac seal leaks, an also checked my codes to see if it pulled anything. The only code I got was p1000 which everyone knows is nothing. Does anyone have any idea what could be causing this?? Any information would be greatly appreciated. Thanks


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Old 03-15-2015, 01:55 PM   #2
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What sort of gas is in the car? Did you recently fill up? It could be you have a bad tank of gas or possibly a lazy O2 sensor
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Old 03-15-2015, 02:01 PM   #3
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I put gas in yesterday, 91 octane like usual. Which set of O2 sensors would do that??


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Old 03-15-2015, 03:13 PM   #4
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Sometimes failing diodes in the alternator can do this also.
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Old 03-15-2015, 04:11 PM   #5
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Okay, I'll check those! Thanks. I was also wondering, all my spark plugs are working but is it possible that one or two aren't performing 100% and just need new ones put in??


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Old 03-15-2015, 04:29 PM   #6
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Originally Posted by dayves View Post
Okay, I'll check those! Thanks. I was also wondering, all my spark plugs are working but is it possible that one or two aren't performing 100% and just need new ones put in??


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When were they last changed? I'd say coil pack before plugs but you could pull and inspect them also.
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Old 03-15-2015, 04:37 PM   #7
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I think I replaced them when I got it a year an a half ago. I pulled them all and looked at them and they all look fine but when I disconnect the wires to the coil packs 1 or 2 of them don't make as much difference as all the others do when I unplug them. Not sure if that means anything or not though.


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Old 03-16-2015, 04:30 AM   #8
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How many miles are on the car?
Do you know if the coils have ever been replaced? Or are they all still the original ones?
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Old 03-16-2015, 05:21 AM   #9
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Tuned?
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Old 03-16-2015, 06:24 AM   #10
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159k, and not that I'm aware of. An It has been tuned.


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Old 03-16-2015, 11:22 AM   #11
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Since you have already replaced the spark plugs, I would be very suspicious of those two coils that you said that when you disconnected them, it made very little difference in the idle quality.
Your car has the right amount of miles where coil failures are typical.
Also, low compression in those two cylinders can cause a misfire.
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