SPARK KNOCK will not cease...even with tune up! -
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Go Back > Models > Jeep Grand Cherokee & Commander Forums > ZJ Grand Cherokee Forum > SPARK KNOCK will not cease...even with tune up!

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Unread 01-15-2003, 04:26 PM   #1
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Join Date: Oct 2001
Location: OK
Posts: 29
SPARK KNOCK will not cease...even with tune up!

I am getting a bad spark knock with the recommended 87 octane even when I have had a BG air/induction cleaning and major tune-up...mostly happens upon acceleration or when engine has a load on it (like going up a hill). Computer has been reprogrammed and we don't know what else to do with it. I have the 2000 JGC Laredo 4x4 4.0 liter and the dealers are puzzled like I am...please help or any suggestions.


Keep Jeeping!
wwevans is offline   Reply With Quote Quick reply to this message
Unread 01-15-2003, 04:59 PM   #2
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Posts: 124
Check your local lemon law...I smell citrus.
98 ZJ Limited I6
Kolak Ignition
Beachead19 is offline   Reply With Quote Quick reply to this message
Unread 01-16-2003, 10:10 AM   #3
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Location: Kenmore, WA
Posts: 290
Perhaps the knock sensor has gone bad?
1993 ZJ Limited 5.2 - no mods - Red with Gold (what were they thinking) trim.
automan25 is offline   Reply With Quote Quick reply to this message

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