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2010 Jeep Wrangler Question: Spark knock, How to get rid of it?

 

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C M, Edmond, OK, November 17, 2012, 18:12
 Rookie

3.8 motor, manual trans.Did more in hot weather. BUT still happens when motor is running temp. I have 33,000 miles. It is definitely Spark knock or motor ping. I have read a lot about it however would like to hear from this site. Only pings when accelerating. Help me please?

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  • Answer #1

    ziptie12 November 17, 2012, 20:10
     Master

    Needs to be hooked to a scanner to monitor data-fuel trim , CTS , O2s ,etc. Poss. running lean or faulty knock sensor. Could be lots of things, diagnose may be cheaper than guessing.

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    C M, November 18, 2012, 14:39
     Rookie

    Thank you. I have an Actron scanner that will show live perameters. Do you know of any numbers to go by? OR what I need to look for on the fuel trim? Will the KNOCK sensor throw a code out? ... I do not have any lights on , on the dash. Thanks CM

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    ziptie12, November 18, 2012, 19:18
     Master

    Have someone else drive it and watch the spark advance and knock sensor activity. Before you get to far into it.......2010 and 33,000 miles- Check your warranty book(s)- may be covered under warranty Federal emissions warranty on some items goes past the standard manufacturers powertrain warranty of 3/36..............back to the other stuff--LTFT should be close to 1.00 +/- .03 check coolant temp.-should be between 210 & 220F fully warmed up.Any aftermarket mods?

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    C M, November 19, 2012, 16:37
     Rookie

    No mods yet. All stock. Bought Jeep used w/ 23000miles. Thanks for the info I will check it out.

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