My car is the shop because of cam timing issue (5.0 NA). This is the 4th time. They replaced the timing chain and all ancillaries, actuators, as well as the sensors. The problem still occurs. They contacted Jaguar technical who asked for hot and cold oil pressures. At speed, the oil pressure is good, but is low at idle. The service manager thinks it is the oil pump, but is waiting to hear from Jag. The car has 96,000 miles and even though I bought it used, it has been maintained by the dealer, (I have changed the oil every 7500 miles).

Has anyone else experienced this?

 

Funny thing is in my experience good oil pressure at speed but low oil pressure at idle is NOT the oil pump (although it could be, but you did say it's Jags 4th try?), it usually is excessive main and or cam bearing clearances. If your dropping or bleeding off enough oil pressure at idle to cause valve train faults, I can only imagine what damage that same low oil pressure has done to your bearings?

 

I mentioned oil pump because that is what the service manager said. I know it could be bearings (I have had that experience with MGs), or it could be the pressure relief valve.

I have my doubts about the bearings (though I could be wrong, it would not be the first time) since I have the service records since new. The oil has been changed regularly at much shorter intervals than the book says.

I wish Jag had an oil pressure gauge. Even on the scan tool, I can't find the pressures.

Right now the dealer is waiting for Jag technical to get back to him.