Misfire at hard acceleration - Mustang Evolution

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Old 08-10-2012, 12:34 AM   #1
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Misfire at hard acceleration

Just replaced my exhaust system and I started to notice a pretty decent misfire, so I changed the coil pack, plugs and wires. It's seems to have taken care of the problem, but every now and then I'll feel a little misfire. Any ideas on what might be causing it?

I started noticing when, upgraded to 2.5in piping with super 44's dumped before the axle.
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Old 08-10-2012, 01:03 AM   #2
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Re: Misfire at hard acceleration

Did you mess with the cats or o2 sensors? Besides that i would say its coincidence.
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Old 08-10-2012, 01:36 AM   #3
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Quote:
Originally Posted by Mr_Trigger3.8
Just replaced my exhaust system and I started to notice a pretty decent misfire, so I changed the coil pack, plugs and wires. It's seems to have taken care of the problem, but every now and then I'll feel a little misfire. Any ideas on what might be causing it?

I started noticing when, upgraded to 2.5in piping with super 44's dumped before the axle.
It's the sensor my friend. It happens to me long time ago. When I change my X pipe to H pipe. Then the car started acting weird. But after I replace my o2 sensor car back to normal. Replace your 2 , o2 sensor after the catalytic . I hope it helps ..
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Old 08-10-2012, 01:27 PM   #4
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Re: Misfire at hard acceleration

check the plug gap and make sure one of your wires isn't resting on a header runner
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Old 08-13-2012, 02:15 PM   #5
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Alright cool. Yea it's probably about time to change my O2's anyways. And when I get the money I'm just slap in some high flow cats.
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