If symptoms leading to a compression check came on suddenly, a cylinder leak down test would be a normal next test. With your engine configuration it will not be easy for sure but pulling the valve covers and checking the valve train for proper action would also be a recommended next test. Warren Anderson Sedona,AZ Greetings 300 Club Members: I did a compression check on my 413 and found two bad cylinders. Numbers 5 & 6 (across from each other) are at 55 psi. The others are 130 - 135 psi. The engine has a strange sound when warm at idle ... not a rod bearing ... it's softer than that. All cylinders were at 130 - 135 psi 8-years ago. Any ideas from the brain truss? Thank you! Mark Schueller, 300C,F [Non-text portions of this message have been removed] [Non-text portions of this message have been removed] ------------------------------------ To send a message to this group, send an email to: Chrysler300@xxxxxxxxxxxxxxx For list server instructions, go to http://www.chrysler300club.com/yahoolist/inst.htm For archives go to http://www.forwardlook.net/300-archive/Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Chrysler300/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/Chrysler300/join (Yahoo! ID required) <*> To change settings via email: mailto:Chrysler300-digest@xxxxxxxxxxxxxxx mailto:Chrysler300-fullfeatured@xxxxxxxxxxxxxxx <*> To unsubscribe from this group, send an email to: Chrysler300-unsubscribe@xxxxxxxxxxxxxxx <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/