Compression measurements will vary depending on how you do them, as well as barometric pressure, temperature, feet above sea level, and humidity (albeit these last few will only make a small degree of difference. The speed of the engine, whether you cranked it with all of the spark plugs out, and whether you had the throttle wide open will all play a part in the reading. At 100 psi on closed throttle, all other plugs in, you're just fine. Tip to others out there. Don't use your thumb. I worked with a guy who did that on a car with a stuck intake valve. The downstroke pulled enough suction to rip the skin right off his thumb... ouch. -Dave -----Original Message----- From: cruznmd [mailto:racuti1@xxxxxxxxxxxx] Sent: Sunday, August 03, 2003 6:08 PM To: DMCForum@xxxxxxxxxxxxxxx Subject: [DMCForum] tone L.O.C. Some bright soul out there asked if I'd put a compression gauge on the car instead of just my thumb. So today, I purchased a gauge from Advance Auto and measured 3 cylinders before the rain drove me inside. The manual states that this engine runs at an 8.8:1 comression ratio but I don't know how many PSI or kPa that is. I measured cylinder 3 at 100 psi, cylinder 6 at 120 psi and cylinder 2 at 90 psi. Now I -already- know that that is insufficient to support self- sustaining combustion. So now I know why the car won't start. Now I need to know: a) What is compression -supposed- to be (in psi or kPa)? b) What are the possible causes of loss of compression? c) What could I do to get it back? I know some of b) but I want to hear as many answers as I can in case I'm skipping something. As usual, thanks. Rich Yahoo! Groups Sponsor ADVERTISEMENT <http://rd.yahoo.com/M=259538.3625325.4914071.1261774/D=egroupweb/S=1705 126215:HM/A=1695348/R=0/SIG=11u38u3s2/*http://hits.411web.com/cgi-bin/hi t?page=1374-105951838331032> click here <http://us.adserver.yahoo.com/l?M=259538.3625325.4914071.1261774/D=egrou pmail/S=:HM/A=1695348/rand=572346768> To unsubscribe from this group, send an email to: DMCForum-unsubscribe@xxxxxxxxxxxxxxx Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service <http://docs.yahoo.com/info/terms/> . [Non-text portions of this message have been removed] Yahoo! Groups Sponsor ADVERTISEMENT <http://rd.yahoo.com/M=259538.3625325.4914071.1261774/D=egroupweb/S=170512 6215:HM/A=1695348/R=0/SIG=11u38u3s2/*http://hits.411web.com/cgi-bin/hit?pa ge=1374-105951838331032> click here <http://us.adserver.yahoo.com/l?M=259538.3625325.4914071.1261774/D=egroupm ail/S=:HM/A=1695348/rand=618840897> To unsubscribe from this group, send an email to: DMCForum-unsubscribe@xxxxxxxxxxxxxxx Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service <http://docs.yahoo.com/info/terms/> .
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