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| Burnt valve?; No compression #3 cylinder | |
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| Tweet Topic Started: Sep 14 2012, 07:53 PM (808 Views) | |
| red92 | Sep 14 2012, 07:53 PM Post #1 |
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I just pulled the head off of my 90 LSI vert. I expected to see a broken valve since i had 0 compression. I tried a compression test after putting oil in the cylinder but no change in compression test. The small valve in the head looks irregular but not broken. It doesn't look round like #1 and 2 cylinder valves. could it be warped? The other two cylinders have 160 & 155 compression. No carbon build up in the passageway in the head. I use seafoam regularly. Comments? |
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| Scoobs | Sep 14 2012, 07:55 PM Post #2 |
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:D
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Take it to a machine shop and get a valve job. Your valve is burnt. |
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| starscream5000 | Sep 14 2012, 08:00 PM Post #3 |
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Got 70 MPG?
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You just described what a burnt valve looks like
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| red92 | Sep 14 2012, 08:01 PM Post #4 |
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Advanced Member
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Any idea what causes it to burn? I had a 92 that the same valve had a piece broken out of it and the passageway was full of carbon. #3 cylinder seems to have common issues. |
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| starscream5000 | Sep 14 2012, 08:18 PM Post #5 |
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Got 70 MPG?
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Some people think it burns more often because it's right beside the EGR passage and runs hotter than the other two cylinders. |
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| red92 | Sep 14 2012, 08:21 PM Post #6 |
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Makes sense. Think ethanol effects our cars. It does cause problems with boat motors in this area. Our local boat shops and mechanics have told me that. |
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| busteriver | Sep 14 2012, 08:40 PM Post #7 |
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Elite Member
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This must be the reason I can only get non ethanol fuel next to boat docks. |
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| JellyBeanDriver | Sep 14 2012, 11:16 PM Post #8 |
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And there's my oddity of a metro. 3/5, 422,000 miles, original engine and valves. |
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| red92 | Sep 15 2012, 10:26 AM Post #9 |
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Advanced Member
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Curious! Do you put any additives in gas or oil? |
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| Car Nut | Sep 15 2012, 11:41 AM Post #10 |
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Gonna blow up next week now that you said that.
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| JellyBeanDriver | Sep 15 2012, 08:53 PM Post #11 |
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Not with enough regularity that I would say it helped. I think clean hydraulic lifters due to regular oil changes and all freeway driving is the reason. I did think about this before I posted . . . . Edited by JellyBeanDriver, Sep 15 2012, 08:54 PM.
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| clarkdw | Sep 15 2012, 09:08 PM Post #12 |
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I think you hit a big nail right on the head. I am finding more and more evidence that the lifters could be a reason for a lot of the valve problems as I learn more about the G10. I think regular oil changes are very critical for us. Maybe Mwebb's OCD approach to oil has some merit although I think fastidious compliance to a carefully reasoned schedule of changes is far more important than simply what alphabet oil you use.I have rebuilt a lot of sticky lifters and seen numerous cases of poor cold running from pumped up lifters even in a reasonably small sample of cars. Edited by clarkdw, Sep 15 2012, 09:09 PM.
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although I think fastidious compliance to a carefully reasoned schedule of changes is far more important than simply what alphabet oil you use.
7:13 PM Jul 10