| abstract |
There are provided methods and systems for improving combustion events during cold starts of a vehicle engine, wherein the cold start events include start / stop events. In one example, a method includes rotating the engine in a reverse direction in response to an engine throttle event wherein a temperature of an intake manifold of the engine is below a threshold to heat the intake manifold by drawing exhaust system heat to the intake manifold. In this way, combustion can be improved in response to engine startup requirements, which can reduce unwanted emissions and improve fuel efficiency. |