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Excess Pre-ignition in My '05 GT

 
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Old 24 Nov 2020, 07:36 pm
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Join Date: Mar 2015
Location: Liberty MO
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Default Excess Pre-ignition in My '05 GT

I suppose any pre-ignition is excessive, but Pressing and holding the loud pedal comes with more than I'd certainly like.

Running the best gas and brands I can around here, but the 91 octane doesn't seem to be enough.

No codes, just too much ping.

PCM replaced a while back, and don't think I got unintended performance upgrade, so...

Thoughts?

Thanks in advance

Bob in Liberty MO
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Old 24 Nov 2020, 08:11 pm
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Join Date: Aug 2014
Location: Thousand Oaks, CA
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Default Re: Excess Pre-ignition in My '05 GT

Carbon buildup in the cylinders?
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