Is throttle body closed at idle?
Is throttle body closed at idle? Although your car's computer recognizes that the transmission is not engaged, the car has to increase the amount of fuel entering the intake manifold in order to compensate for the extra air. In that case, the throttle body blade will be able to close entirely when your car enters idle. What causes build up in throttle body? Throttle bodies become dirty due to carbon deposits building up in the combustion chamber over time and when the air filter element is still in use well after it has exceeded its recommended service life. Carbon build-up...