CASS98SE

I decided to do a compression test on my car tonight. I 150 psi in 2,4, and then 0 in #6. The piston was moving up and down fine.. What gives?

WizzaMax

iTrader: (9)

probably did not have a good seat in tester,,,try again...

1FSTMAX

iTrader: (29)

My friend had this problem with his Lexus, and it turned out to be that the exhaust valve had a missing piece. I hope it't nothing serious.

Jkuan

I would do a leakdown test to see where you are having a problem.

rmb

Was the motor running like absolute **** before you tested it? You wouldn't need a compression test to tell you the motor's fried with no compression in one cylinder.

If it was. Test it again. Same results then you've got a 1)burnt valve 2)holed piston 3)fried rings or worse things....

-RMB

CASS98SE

Yeah my car runs like **** now. It is 0 psi. Do you think I should rip it all apart? People warned me about boosting without guages. Somethign got very hot cylinder #2 spark plug electrode was white, #4 green-yellow??,#6 black and chunky. Thats not good. Im hoping for a burnt valve.

jdmmax

iTrader: (6)

whoa i think the lowest is 154 psi for compression. sorry to hear man. good luck

rmb

Wow... she's dead Jim.....

Next step would probably be to just pull the heads and take a looksie..

Could you hear any muffled backfiring when it was running? Probably an exhaust valve in that case...

What's the compression in the other cylinders?

-RMB

turbomax97

iTrader: (6)

time for a junkyard run for a motor

Kashoggio

iTrader: (11)

when you have 0 psi in a culinder it is most likely that you ahve a hole in the piston. One way to check this is to do a cylinder leakdown test. If have excessive air coming out of the dip stick valve or even maybe the oil filler cap you have a bad piston, If its coming out the intake= intake valve exhaust = exhaust valve. But a good piston having put 100 psi in to it should hold no less then 10% difference of that piston.