Quote:
Originally Posted by t0oL
if it's running rich with borderline CO, MAYBE you could wait until the gas tank it really low on gas and add lots of methanol to the gas in the tank.
It has Oxygen already in it and would affect the CO readings until you run out.
Look for methanol in HEET gas line deicer. It's reasonably priced and 3-4-5 little bottles to a really really low tank of gas (like the last gallon) could change the carb from rich to lean, as a methanol carb would use about twice the volume as a gas carb would. The added Oxygen as CH3OH would also aid in producing CO2 instead of CO. A double emissions whammy.
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This was the whole concept behind oxygenated gasoline. It works great in a open-loop carb but on the 307 the O2 sensor will see the lean exhaust and increase the duty cycle on the mixture control solenoid to compensate. In fact, to get off on a little tangent, the whole oxygenated gasoline thing is now moot due to computer controlled cars. Unfortunately, as with any gov't program, once it's in place it's impossible to stop, even if it no longer makes sense. In fact (and talking about double whammies) the use of oxygenated gas not only no longer helps cut emissions, but since the computer richens the mixture to compensate, the mileage goes down so it also INCREASES gas consumption. Thanks, Congress...
Back to this particular 307 - with the carb properly adjusted there should be no need to resort to these tricks (even if they did work with this particular motor). My 307 failed initially, but once I properly tuned it none of the emissions levels were above 50% of the allowable, and most were well below even that.