HCS Snowmobile Forums - View Single Post - 2002 ZL 600 EFI servo cycle issue
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Old 01-16-2017, 08:11 AM   #4 (permalink)
Join Date: Jan 2017
Posts: 16
Current Sled(s): 2001 ZL 800 ESR
Previous Sled(s): 2002 ZL 600 EFI/ESR
Location: Maine
Favorite Riding Area: Central and Northern Maine

Power valves were cleaned and are free. I checked the adjustment and it was right in the middle of the range. I only have a few miles on this season and it was running great. The servo on the EFI from what I have read is not supposed to test or clean cycle after start up but it seems like that is what mine is doing. If I unplug the yellow and browns two wire going to the ECU to power the servo circuit the sled runs fine? When I plug it in it will idle for a few seconds then the servo cycles to open and closes and engine dies. You can hear the difference in the exhaust when the valves open. Could the ECU be getting a bad RPM reading?
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