2006 Mercury 115 EFI (4 stroke); 2007 18' Crestliner Mirage
by Tony Sylvester
Intermittent problem: On startup, the tack will read 1500 rpm, even though I can hear that it is running at the normal 700. Upon acceleration, the tach will read high, as well. When this happens, I cannot even get up on plane and the tach will be reading 4500-5000 rpm. The tach reads high even though the engine is running at "normal" rpm. I rarely run the engine above 400rpm. Sometimes i can correct it by shutting off the engine and restarting it. I checked the engine oil level and it is within range. The discharge water temperature does not seem overly hot such that it would indicate overheating.
Click here to post comments
Join in and write your own page! It's easy to do. How? Simply click here to return to Mercury Forum.