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Unread 04-18-2014, 02:24 AM   #1
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2000 XJ Cherokee 
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2000 Cherokee Sport Oil pressure/check gauges+ CEL

So ever since about a month after I bought my cherokee every time I drive it hard, and by hard I mean highway driving 75 mph basically anything that involves higher rpms, after stopping or returning to lower rpms my check gauges light comes on and my pressure drops to 0. Everything I've read on this says oil pump blah blah but not sure if that's what I need because along with this issue, for about 2 weeks now my CEL has been on with codes for multiple misfires detected, misfire in cylinder 3 4 and 6...

ANY ideas what this could be

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Unread 04-18-2014, 07:35 AM   #2
AZ Jeff
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If you have been reading "oil pump blah blah" then you have probably also read that the first thing you ALWAYS do when the oil pressure indicates low is to connect a mechanical gauge temporarily and confirm oil pressures with something more reliable than the dashboard instrument.

As far as CEL issues, multiple misfires on various cylinders could be a multitude of reasons, but I would start by checking spark plug condition before diving into more complex stuff.
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Unread 04-18-2014, 09:12 AM   #3
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Good chance it is the oil pressure sending unit, does the engine rattle and knock when you hit zero? Mine would drop to zero, 'check gauges' light would come on but it was the sending unit. Also, as noted above, confirm with a mechanical gauge and check your plugs before you start dropping $$.
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Unread 04-18-2014, 01:53 PM   #4
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1999 XJ Cherokee 
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You might have a worn Oil Pump Drive gear, which may cause slipping oil pump drive and a resultant out of sync camshaft position sensor mounted on the oil pump drive.

Not that common in the 2000/2001 4.0, but it does happen.

If you think you want to examine the OPD gear let us know and I will post up the procedures for R&R of the OPD and Cam Sensor.
If we have data, letís look at data. If all we have are opinions, letís go with mine.
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