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ECM recognizing my upgrades?

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Old 01-10-2014, 12:14 PM
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ECM recognizing my upgrades?

Hello all,
I am a first timer. I have a 2007 L2 HHR I have put a K&N cold air box and have installed a magna flow exhaust will my ECM recognize my upgrade? I really can't tell if it has!
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Old 01-10-2014, 12:27 PM
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Welcome to the site, I have a '07 factory K&N replacement and Magnaflow muffler, the ECM did not have and issues, I did disconnect the battery negative cable for a 1/2 hour or so, to let the computer reset, and relearn.
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Old 01-11-2014, 08:54 AM
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Welcome to the site
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Old 01-11-2014, 11:02 AM
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to the forum!

As Oldblue mentioned, disconnecting the Negative battery cable triggers the ECM's "Learn Down" mode which will allow it to adjust fuel trims and other variables accordingly.
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