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Modified by zhan28 at 7:09 AM 3/17/2008

 

sounds like a head gasket and possibly rings

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by zhan28 &raquo;</TD></TR><TR><TD CLASS="quote">hey guys i just did a compression test today on my lsvtec and it went c1-198 c2-200 c3-175 (****) c4-198, so it seems that the third cyclinder is down, can neone tell me what could be the cause of this? the spark plug on the third cylinder had a lot of corrosion and greenish material aka antifreeze maybe, is this something that i should be super concerned about? in other words is my motor gonna break anytime soon? and where should i start at trying to fix this?</TD></TR></TABLE>

Was the engine hot when you did the comp test? Throttle held open?

Put some oil (not much) down in the cylinders and then comp test again, If the numbers shoot up way high then you have weak rings.

Best way to see where exactly you're leaking/losing compression is by doing a leakdown test.

 

what kind of hg should i get, is it okay to use the cheap ones from ebay that are 100 dollars?

 

diff do a leakdown test it will break down were the problem is.. sounds like your rings

 

anything more than a 15psi difference between cylinders is usually a ring problem...leakdown test it and get back to us

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by zhan28 &raquo;</TD></TR><TR><TD CLASS="quote">what kind of hg should i get, is it okay to use the cheap ones from ebay that are 100 dollars?</TD></TR></TABLE>

and NO!! OEM son

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by boots &raquo;</TD></TR><TR><TD CLASS="quote">

and NO!! OEM son</TD></TR></TABLE>

Yea what crazy ol boots barkley said

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by zhan28 &raquo;</TD></TR><TR><TD CLASS="quote">what kind of hg should i get, is it okay to use the cheap ones from ebay that are 100 dollars?</TD></TR></TABLE>


before you get to carried away, you have to determine if you have a problem first and if you do, what the problem is. First off, did you do the compression test correctly? Many people forget to deactivate the fuel system so they get low numbers. Tell us EXACTLY how you performed the test and we'll go from there.