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Unread 04-24-2014, 07:05 AM   #1
tramark100
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Join Date: Nov 2013
Location: Alpharetta, Ga
Posts: 7
2011 jk 3.8

Has anyone experienced pre ignition or valve clatter with the 3.8? Does not happen all the time but seems to be tied to bad gas, even from the name brands. Try to use 87 octane due to current cost of gas.

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Unread 04-24-2014, 11:13 AM   #2
Jiblet
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2008 JK Wrangler 
 
Join Date: Dec 2008
Location: Boston, MA
Posts: 848
Quote:
Originally Posted by tramark100
Has anyone experienced pre ignition or valve clatter with the 3.8? Does not happen all the time but seems to be tied to bad gas, even from the name brands. Try to use 87 octane due to current cost of gas.
Did you get some of that bad mix Exxon Mobil shipped from Baton Rouge mid March?

Any codes coming up?

Check voltage/resistance of wiring to knock sensor. Could be failing.
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