Low Compression

[Aztec]

I did a compression test today on the old girl and things seem a little wierd. I was only getting 800kPa (give or take 10-15 between the 6 cylinders) when the manual said I should be reading 1177kPa. Because the 6 are so similar does that mean the previous owner has reduced the compression? Also does that indicate there were bigger turbos running high boost in the past?

I keep finding these little clues that suggest my car has been seriously modded, then changed back to stock before it came to Aus. The intercooler pipe that runs next to the block (with the writing on it) had loose nuts, one was about to come off!!

Any opinions on the low compression?

[blind_elk]

Did you do the test with WOT?

A better idea of engine condition is a leak-down test.

[siksII]

as long as its quite even chances are its fine, the actual value can be low/high depending on lots of factors such as battery, engine hot/cold etc.

leak down will confirm as blind_elk suggests