Toyota-Lexus-Subaru-Honda Carburetor Mixture Adjustment

If your vehicle’s is running either a bit “lean” (not enough gas) or a bit “rich” (too much gas) at idle, it can result in a rough or erratic idle.

For many people this condition seems predominantly to be simply an aesthetic issue that subtracts a bit of pleasure from their driving.

It does decrease fuel efficiency and gas mileage. Either condition also increases the amount your vehicle contributes to pollution.

If it’s far enough out of adjustment it can make the difference between passing the DEQ emissions test or not.