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No compression in cylinder 4 WTF!!!!

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Old Mar 2, 2008 | 03:44 AM
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Default No compression in cylinder 4 WTF!!!!

ok I got 210 in cylinders 1-3 but cylinder 4 had none what so ever.......I was doin about 80 on the interstate, once I got off it felt like it had a miss, so after I got off worjk I went and got sparkplugs, changed them and nothin. I drove it back home and did the compression test...What do u guys think it could b? The car isnt smoking at all.
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Old Mar 2, 2008 | 04:23 AM
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03AcuraCLTypeS's Avatar
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bad plug wire or distributer?
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Old Mar 2, 2008 | 04:55 AM
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Originally Posted by 03AcuraCLTypeS
bad plug wire or distributer?
that wouldnt cause no compression, im gettin fire to that cylinder
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Old Mar 2, 2008 | 05:42 AM
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you need to do a cylinder leak down test to determine what the problem is.
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Old Mar 2, 2008 | 06:53 AM
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im pulling the head off now and will popst pics as soon as im done
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Old Mar 2, 2008 | 07:01 AM
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maybe you have bad piston ring in that cylinder or you somehow bent some valves for that cylinder. I had a case where i had no compression what so ever and it was because i bent the valves. Let us know when you take the head off.
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Old Mar 2, 2008 | 08:02 AM
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you should do a leak down before removing the head. once the head is off, if you dont find anything wrong and suspect the rings, you will be sorry you didnt test to be sure.
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Old Mar 2, 2008 | 08:07 AM
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check to make sure your Locking nut is not coming loose,if so it could be holding the valve open more on the rocker arm
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Old Mar 2, 2008 | 09:20 AM
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here's the aftermath

looks like I need a new valve, there's no damage to the piston at all
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Old Mar 2, 2008 | 09:23 AM
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anyone have a idea of what could have caused that? Btw thats the exhaust valve that has a hole in it, that explains Y I wasnt getting no compression
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