- Dec 8, 2020
- Reaction score
Definitely check the O2 sensor and O2 Sensor Draw Tube. I have found that this is the culprit of my idle issues and cold start issues when the carbon has built up and starts to clog the air flow.
I have tried everything to reduce the carbon, but now down to each season, do a Seafoam decarb, pull the O2 sensor and clean out all the carbon, soak the parts overnight, except the O2 sensor itself, must be careful not to damage it. When put back together, starts perfectly and idles right at 700rpm like it should.
Thanks, ROBERTH and everyone else for sharing your knowledge with me. Collectively y'all have already made a world of difference in how it runs. Setting the TPS right helped a lot. I think it was running very rich at lower throttle openings (since the TPS was out of calibration) and that was causing the engine to stumble. Once the O2 sensor is clean and working properly I expect the small remaining stumble/roughness will go away. I'll pull the O2 sensor, housing, and spindle in the "draw tube" this Sunday and clean it all up. And, if I have the time, I'll splash the boat and test out the results.