On Tue, 20 Jan 2004 17:23:30 -0000, Bill Robertson wrote: > CIS (Constant Idle Speed) system has been covered before > (this is a very good engine to search the archives): > http://www.dmcnews.com/search.html Could be me, but I thought CIS was for Constant Injection System as the system injects fuel, no matter whether the intake valves are open or not... It's been explained to me that that's the reason for the oddly shaped "crab"-like intake manifold; the longer tubes are supposed to "store" the injected fuel in the time the valves are closed... But no argument on the idle-explanation ;-) JAN van de Wouw Thinking Different... Using a Mac... Living the Dream... Driving a DeLorean... #05141 "Dagger" since Sept. 2000 --------------------------------