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Unread 06-12-2013, 08:11 PM   #1
ironbike
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2011 JK Wrangler 
 
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What the heck is the noise?

Ok, little background here I have owned the following Jeep brand vehicles and all have had this light knocking noise during acceleration. The dealer seems to have no answers for me?

I did do a "knocking noise" search but none covered my question completely

1987 Wrangler
2000 Jeep Cherokee
2004 Jeep Grand Cherokee limited
2008 Jeep Liberty
2011 Jeep Wrangler (current)

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Unread 06-12-2013, 08:38 PM   #2
222Doc
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sounds like ping/ predetonation .? bad gas.
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Unread 06-13-2013, 02:40 PM   #3
ironbike
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Quote:
Originally Posted by 222Doc View Post
sounds like ping/ predetonation .? bad gas.
I don't know if it is bad gas but if that is the case I will try some higher octane next time. most of the time it happens when I am going up the hill when the motor is straining a little bit
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Unread 06-13-2013, 04:16 PM   #4
larjeep
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Not bad gas always just real **** gas. Use a octane booster in the tank and put some higher gas in next time. If that don't fix it your timing is off.
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Unread 06-14-2013, 08:27 PM   #5
jokerchief462
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When you could set timing before computers we use to advance the timing 2 degrees to get rid of the ping. But a lot of time it is an octane knock as mentioned from this crappy corn fed fuel.
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Unread 06-16-2013, 08:08 AM   #6
ironbike
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I usually just run 87 so maybe I'll switch to 89
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Unread 06-28-2013, 07:11 PM   #7
ironbike
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Just as an update. I have switched to 89 gas and no more pinging noise at all
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