Cylinder 2 and 4 low compression for My Toyota Celica 2000 GT-S?

Mobin Celica · 03 Jul 2010, 03:03 pm

I have been trying to fix this problem but couldnt figure it out. I did a compression test and cylinder 2 adn 4 were low on compression, one was 90 and one was 120. The codes im getting is that cylinder 2 and 4 are misfiring or sometimes it woudl say random misfire . Can someone please tell me whats the best way to fix this problem. Thanks i would really appreciate it.

The other 2 cylinders are fine the compression was 180 but only numebr 2 and 4 were low one was 90 and one was 120. I really want to fix this and im gettign confused can someone please help me. I would really appreciate it.

cbulen · 03 Jul 2010, 03:06 pm

You didn't state what your readings were on the other cylinders. We need to know those to help you. If compression is less than 75% of your highest cylinder, then you have a problem. At this point, you should do a leak down test.

In the May 2009 issue of my (free) newsletter on my site, I describe how to do a leak down test, and what the results will tell you. A leak down test can tell you if the problem lies with your intake valves, exhaust valves, head gasket, or piston/cylinder walls.

I also show how to convert a compression tester into a leak down tester, but you need an air compressor as a source of air.

tlworkroom · 03 Jul 2010, 03:09 pm

I would go by what "Cbulen" says, he sounds pretty experienced.

But what it sounds like is that the rings are going bad in those 2 cylinders. Or it could be something as easy as the plugs aren't screwed in tight enough. On my old Corolla, the plugs actually unscrew slightly with several months. So about twice annually, I check and tighten the plugs again to make sure they're sealing properly. Because I notice when the car stops running as well as before. But you do NOT want to screw the plugs down as hard as you can. Just a little past snug fit. You've got to be able to remove them when you need to.

Cylinder 2 and 4 low compression for My Toyota Celica 2000 GT-S?

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