Originally Posted by DirtyRabbit
No not yet. Where can I get that done?
you can pay a shop todo it or you can todo it yourself; basically you pull out a sparkplug, hold this http://www.autozone.com/autozone/acc...ier=87582_0_0_
in the hole and have someone spin the motor; the gauge will give you a number
you do all the cylinders and compare the numbers, 145-160psi is a typical range to expect
a cylinder with significantly different compression is a tell tale of issues; that could be your hard starting issue
regarding your low oil pressure; you may want to validate that your sending unit / gauge is working or not working; having it 'jump' to 40 seems odd
you can read through the forums; quite a few threads on low pressure and the xj's