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Gary, Australia Car Mechanic
Category: Australia Car
Satisfied Customers: 1002
Experience:  Senior Technician
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Ba XR8. Compression Test R Bank 160psi L Bank (5) 100psi (6)

Customer Question

Ba XR8. Compression Test R Bank 160psi L Bank (5) 100psi (6) 40 (7)165 (8) 110. Could it be Head gasket, or Cracked Head or ??? David Stewart
Submitted: 1 year ago.
Category: Australia Car
Expert:  Gary replied 1 year ago.

Hi David,

Compression pressures are all over the place on the left bank.

I would do a leakdown test on each cylinder individually to find the losses.

A different test and more accurate than a simple compression test.

I would take off the left hand rocker cover to see if the timing chain is intact.

And I will dare say this will not be a cheap repair.


Customer: replied 1 year ago.
Thanks Gary, would you be able to give me a rough Idea on $$
Expert:  Gary replied 1 year ago.

Hi David,

Being a quad cam, IF a chain is broken, I'd say it's engine out for a full rebuild.

Your compression figures don't have a pattern towards head gasket issue.

At this point, you have two further tests to do.

1. cylinder leakage test, results of which may confirm the obvious.

2. valve cover off for chains inspection

Do you have a mechanic that can do this for you?

You could be looking at anywhere between $5000 - $15000 depending on far you want to go with the rebuild.


Expert:  Gary replied 1 year ago.

Hi David,

Have you had any luck with your car?

I hope I was of some guidance to you.