Quote:
Originally Posted by zkeeper
The left side valve open rate is heat related and it takes place up front with aux pumps...so go in and have it checked. I know of three in our area, and they all have left side open up in about 35 to 40 seconds. I don't think comfort as anything to do with it...but I could be wrong on that. The electronic action back there on left side is actuated by up front temps in intake.
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It opens in sport all the time. Exception to this is it is shut during startup in order to create more resistance to warm the cat up from what I understand. Same reason the car settles into a lower idle. Helps emissions.