Originally Posted by
DualSportDad
On one of my n/a crossfires I have a aftermarket secondary air pump that is pretty loud and I can tell you it most certainly does come on at times during idle after the engine is hot. Iwill try and find the time to brush up on the secondary air system this weekend in case this is the issue that is causing his CEL.
Edit: when the pump comes on at idle after the engine is hot (sitting at a stop light) I'd say I have never heard the pump run for more than 2-3 seconds, if that helps at all.
I get the secondary pump coming on briefly after driving the car and then coming to a stop at idle as a short shot of fresh cool (relative) air into the exhaust could help cool the manifold. But, wouldn't injecting air into the exhaust any longer than that cause the O2 sensor to signal a lean condition and increase fuel when it is not necessary? Padgett was idling for fifteen minutes. Could the secondary pump find the increase in exhaust temperature over that 15 minute time frame and think it is time to turn on for a couple seconds? or longer?