We have a 1986 Jaguar xj6 in the shop because it wont start. The owner said it has been sitting for 5 years in a garage and has not been ran since than. This car we finally got it to run for about 15 minutes ran and idled farly good. The next day we tried to start it we couldn't even get it to try and run. So we did our test procedures on it and we have good spark on all cylinders and we have good fuel pressure. So we went and tested compression and we found out that #1 had 0 pounds, #2- 0 pounds, #3 - 0 pounds, #4 - 0 pounds, #5 - 50 pounds, #6 - 0 pounds!!!. What is going on with this car? Have any of you had this sort of problem before? We are headin to thinking the piston rings are bad. As far as we can see the valves are closing and opening. We also did a leak down test were we inject air into the cylinders and see where the air escapes but we can not see it come out the exhaust or the intake. Any advice would be greatly appreciated

 

Fuel pressure is running about 40 - 42 PSI

 

Anybody have any advice?