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I need to keep better track of this thread, I just caught up and the whole time you were talking about knock I was thinking "you are pulling in too hot of air" lol.
Cover the grill back up and let the engine ride at 200* like you were before but figure out a spot to pull in cooler air. The engine running hotter is good for MPG and not bad for parts at that temp, just need it to stop causing the intake to pull in such hot air.
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-Mike
2007 Ford Focus ZX5 - 91k - SGII, pending upper and lower grill bocks - auto trans 
1987 Monte Carlo SS - 5.3/4L80E swap - 13.67 @ 106
2007 Ford Focus Estate - 230k - 33mpg - Retired 4/2018
1995 Saturn SL2 - 256K miles - 44mpg - Retired 9/2014
Cost to Operate Spreadsheet for "The New Focus"
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