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B4C · 08-24-2010, 08:28 PM

Looked at a jeep tonight and its has piston slap at idle, goes away at around 1300 rpm. I know this is a common issue with the 4.0, its a 1990 cherokee. Anyone know how long these motors last with this problem?? Thicker oil help??

08-24-2010, 08:28 PM	#1
B4C Join Date: May 2007 Location: Jim Thorpe PA Posts: 2,134 iTrader: (1)	Jeep question Looked at a jeep tonight and its has piston slap at idle, goes away at around 1300 rpm. I know this is a common issue with the 4.0, its a 1990 cherokee. Anyone know how long these motors last with this problem?? Thicker oil help??