Question about 2001 Jeep Cherokee
4.0 I6 pressure is normal until I stop at stop sign or light, then it very slowly creeps down to around 7 psi.
The new oil pressure is affected by the pump speed especially an oil pump that has done a lot of work. Low water pressure is usually a sign of engine wear particularly around the mains and bigends.
As the motor ages and all the parts become worn more and more is lost into the crankcase. As you rev the motor the oil pressure increases and will maintain its pressure at around six or eight PSI.
When you change the oil in the hydraulic tappets drain the oil away and so when you restart the engine after you have changed the oil the worn oil pump take some time to get new oil up and around the hydraulic tappets.
This is a common problem with well used engines, it does not mean that they are not usable but it does mean they are starting to show their age.
Posted on Feb 20, 2012
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Posted on Jan 02, 2017
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