Misfire Issues

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12-13-2008, 04:14 PM

cb1499je

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Join Date: Dec 2008

Location: north carolina

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Misfire Issues

I have a 2005 Mustang GT with JLT cold air intake with sct tune. My engine is misfiring in the high rpm bands. Any suggestions on how to fix this issue?

12-13-2008, 04:17 PM

WhiteFoxGT

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Join Date: Jul 2006

Location: Delaware

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Is it a custom tune or canned tune? Could be detonation up top, the cold airs really make S197s go screwey without the proper tune. Are you running the right fuel?

12-13-2008, 04:20 PM

cb1499je

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Join Date: Dec 2008

Location: north carolina

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its a custom tune from ford racing, and i'm running 93 octane, but i am using stock spark plugs do you think that could be the issue?

12-14-2008, 02:40 PM

WhiteFoxGT

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How many miles are on the car? I doubt its the plugs

12-17-2008, 09:14 AM

cb1499je

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Join Date: Dec 2008

Location: north carolina

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I have 20,000 miles on it.

12-17-2008, 09:15 AM

cb1499je

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Join Date: Dec 2008

Location: north carolina

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but i have had the plugs replaced because they burnt out

12-17-2008, 05:16 PM

Chopper

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Join Date: Feb 2004

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BURNT OUT???????

If you burnt the plugs the mix needs fattened up,,,NOW,,,before you burn a piston or bust a ring.
That tune needs to be evaluated for timing AND mixture.