Tim Matter
Recruit
- Joined
- Apr 20, 2003
- Messages
- 2
Can any of you Mercury outboard guys help me out? The motor has basically ran this way since new. It's gotten to be quite annoying. Here are the symptoms:<br /><br />1. It starts good but at warm up and idle RPM it coughs, sneezes, and sometimes dies. This is most prevalent at high idle (1500-2000 RPM). If it continues to run after a cough, it will slowly regain RPM till it does it again. Approximately 5 seconds between coughs.<br /><br />2. Engine and air temp do not affect the way it runs at all. <br /><br />3. When under way it runs extremely rough till about half throttle, then bang, immediate smooth power and RPM without warning. Passengers are really impressed with this. It does this every time without fail.<br /><br />4. I also noticed the bottom two carbs do not have idle mixture adjustment screws??? and there is some sort of enrichment(???) valve activated by the throttle arm on the left side of the block. What gives here? How does the fuel system operate?<br /><br />5. Also changed spark plugs; no change. <br /><br />Any explanations or ideas ?<br /><br />Thanks<br />Tim