sluggish 2007 Mustang GT - Ford Mustang Forum
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post #1 of 5 (permalink) Old 09-18-2010 Thread Starter
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sluggish 2007 Mustang GT

I have an O7 GT that I recently added a K&N intake and SLP Loudmouth pipes. She has started being a little sluggish. When I push on pedal she hesitates. Any ideas what may be wrong with her?

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post #2 of 5 (permalink) Old 09-18-2010
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First check for vacuum leaks. The importance of this can not be over emphasized. Even the tiniest vacuum leak will cause problems.

The 2005+ Mustangs are far more sensitive to changes to the intake and exhaust. Need more details on the mods done.

For example, is the K&N intake the type that normally requires a tune? What does the manf say?

Is it an oiled air filter? If yes, this could be the source of the problem. An oiled air filter will contaminate the MAF causing it to read high at idle and low under load. This causes the motor to swing from rich at idle to lean under load.

Clean the MAF. Use only a product designed for the job.

What about the exhaust system? Does the manf state if a re-tune is needed?

2003 GT Convertible (sold & missed)
2000 GT coupe (Craigslist project. Fixed. Now my DD). Windsor to Romeo swap.
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post #3 of 5 (permalink) Old 09-19-2010
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How many miles since its last tune up? Like the other guy said check for vac. leaks. When was the last time you replaced the fuel filter? Good luck!
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post #4 of 5 (permalink) Old 09-20-2010
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well k&n says no tune is needed ans slp lm's are just an axleback so i doubt theyre the source of the problem. a scantool would shed some light on this.
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post #5 of 5 (permalink) Old 09-21-2010
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Disconnect your battery for a few minutes to reset the adaptive learning. That might help.

1965 Mustang Coupe
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