- COMPRESSION TEST

1996 Toyota Paseo

Tiny

jroberts1234

January, 3, 2011 AT 2:41 AM

In completing a dry compression test my results were as follows:

1 - 140
2 - 10?
3 - 100
4 - 170

I repeated the test twice cranking the car for 5 seconds on each cylinder.

The car runs fine but does burn a lot of oil which is not noticeable in the exhaust, but is noticeable in the fact I have to put in about 2 quarts every 2.5 weeks.

Questions:

1) Could this car run apparently normally, with an occasional rough idle, while seemingly having no compression on cylinder #2?

2) On a related note, if I wanted to do a leak test, how would I manually turn the cylinders to top dead center for each leak test?

Thank you.

FOUND 202 RELATED QUESTIONS

7 Answers

Tiny

obxautomedic

January, 3, 2011 AT 3:25 AM

Hello,

Ok, you done the dry test now to find out if rings or valve seals are worn you need to do a wet test. And all you do is sqirt some oil into the cylinders. If compression increases then rings are worn if no change then Valves or valve seals are worn.

.

Tiny

jroberts1234

January, 3, 2011 AT 1:46 PM

Good Morning. Thank you for your reply.

1. I will do the wet test this weekend to confirm the rings or valves, but: a) Could this car run apparently normally, with an occasional rough idle, while seemingly having no compression on cylinder #2?

B) If I wanted to do a leak test how would I manually turn the cylinders to top dead center for each leak test?

Thanks.

Tiny

obxautomedic

January, 3, 2011 AT 5:21 PM

Sorry, forgot to answer the other question.

Honestly the vehicle should run ruff as hell since it is a 4 cylinder all the time with no compression in any one cylinder. What you may want to do is recheck the #2 cylinder before doing the wet test. It is possible the compression tester didn't seal properly.

To Manually turn the Engine you can get a socket to put on the Crank Bolt just make sure you turn engine in right direction.

Tiny

jroberts1234

January, 4, 2011 AT 1:52 AM

Thanks for the information. Does the crank always turn clockwise (when facing it)? How do I tell the correct direction?

Tiny

obxautomedic

January, 4, 2011 AT 4:40 AM

You will need to start the vehicle and look or have someone just bump the key a few times to figure out the rotation.

I am pretty sure it spins clockwise, but alway nice to just double check.

.

Tiny

jroberts1234

January, 4, 2011 AT 1:38 PM

Ok, thanks.

Tiny

obxautomedic

January, 4, 2011 AT 3:21 PM

No problem.

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