Subject	Compression increase by adding oil to that cylindere>>
Posted by	ZUL8TR on April 13, 2011 at 6:37 AM
	This message has been viewed 187 times.
In Reply To	Changed spark plugs and did a compression test... posted by Adamo on April 12, 2011 at 10:41 PM
Message	is standard procedure for checking the condition of the rings. With the compression increase you note I would suspect the rings are worn in that cylindere. The excess gas in the manifold is not normal. Look into the fuel pressure regulator and the fuel modulator diaphrams for possible leaking fuel. These are easy to check by seeing if they hold a vacuum applied by mouth with a short hose attached to them. If they are bad it will effect fuel pressure and performance. Do a vacuum test with the engine running. Place a vacuum gage on a nipple at the balance tube. Run engine at idle, gage should be a very steady needle at about 19" Hg and a very steady needle at about 20" Hg holding 2000 rpm. Unsteady needle could mean leaky valves. Here is a link for the vacuum testing [ http://www.atlanticz.ca/zclub/techtips/vacuum/ ] ZUL8TR in Orlando,FL
Follow Ups	Changed spark plugs and did a compression test... - Adamo 22:41:27 04/12/11 Compression increase by adding oil to that cylindere>> - ZUL8TR 06:37:23 04/13/11 I changed the FPR and dampner last year, so really doubt its - Adamo 08:49:37 04/13/11 Your 2 & 4 numbers are too low compared to the others. - ZUL8TR 06:42:57 04/13/11 Sh*t I forgot to have my brother push the throttle - Adamo 07:13:41 04/13/11 a common problem with people doing compression tests is - Carlos Ramirez 06:50:27 04/13/11 Bingo, I fall into number 1. I completely forgot - Adamo 08:51:55 04/13/11 There is no reason to open the throttle bodies on a Z32 - Bernie (NoVA) 09:05:36 04/13/11 yap sounds right.. either way is good. (n/m) - Carlos Ramirez 10:02:48 04/13/11 Ok so no need to redo the test, I had the balance tube off.. - Adamo 12:06:35 04/13/11 yep (n/m) - aliaZ 12:27:24 04/13/11 Re: Changed spark plugs and did a compression test... - Huber300zx 08:00:53 04/13/11 Thanks, I'll check that too (n/m) - Adamo 08:40:06 04/13/11 Besides all the things mentioned below - you could just - jzack 18:25:00 04/13/11 Thanks for the tip, I will definitely look into it. (n/m) - Adamo 18:44:11 04/13/11
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