whistling sound after car warms up?
07-08-2003, 07:03 PM
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whistling sound after car warms up?
I just bought the S, i have 500 miles so far, never hit v-tech, mild acceleration, sometimes a little harder...
I noticed that when i start up the car, and it has to warm up all the way to 3 bars from 1, that it makes a whistling sound after the rpm drops to 1 from the 2 when i start up.
Sounds pretty cool, like a jet engine, but should i be worried?
I noticed that when i start up the car, and it has to warm up all the way to 3 bars from 1, that it makes a whistling sound after the rpm drops to 1 from the 2 when i start up.
Sounds pretty cool, like a jet engine, but should i be worried?
07-08-2003, 07:09 PM
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Don't worry about it. That is the Secondary Air Injection Unit that causes the catalytic converter reach normal operating temperature quickly during startup. Basically, it's an emissions system that lower pollutants in your exhaust. I
Just say that you have a supercharger if anyone asks.
Just say that you have a supercharger if anyone asks.
07-08-2003, 07:13 PM
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From another thread.
Originally posted by Utah S2K
Code P0410 is associated with the Pulsed Secondary Air System. This system functions when the car is cold by injecting air into the exhaust ports. The amount of air is regulated by an air control valve which is controlled by the ECM. When fresh air reacts with unburned exhaust gasses, the exhaust gas temperature rises. This rise in temperature promotes faster warm up of the catalytic converter, resulting in cleaner emissions during cold start up. The pump activates for a short period (i.e. less then 60 seconds).
Most frequently this code is set by someone revving up an unloaded cold engine (i.e. lets hear that exhaust/intake). The system is temperature specific. Let the car come down to ambient and then reset the ECU. Warm it up and see if the code still shows (if you are using either a PGM Scan Tool or OBD Explorer make sure you request a new set of data!). If you still get a MIL light drive around for a mile or two....it may clear itself. If it does not the go under the drivers side bumper just behind the fake intake and check the wiring. The air pump has a large hose coming from it so it's easy to find (it's location is also the reason the CAI guys go to the passenger side).
Utah
(Ref: Helm 11-28....for those with a Helm Manual)
Code P0410 is associated with the Pulsed Secondary Air System. This system functions when the car is cold by injecting air into the exhaust ports. The amount of air is regulated by an air control valve which is controlled by the ECM. When fresh air reacts with unburned exhaust gasses, the exhaust gas temperature rises. This rise in temperature promotes faster warm up of the catalytic converter, resulting in cleaner emissions during cold start up. The pump activates for a short period (i.e. less then 60 seconds).
Most frequently this code is set by someone revving up an unloaded cold engine (i.e. lets hear that exhaust/intake). The system is temperature specific. Let the car come down to ambient and then reset the ECU. Warm it up and see if the code still shows (if you are using either a PGM Scan Tool or OBD Explorer make sure you request a new set of data!). If you still get a MIL light drive around for a mile or two....it may clear itself. If it does not the go under the drivers side bumper just behind the fake intake and check the wiring. The air pump has a large hose coming from it so it's easy to find (it's location is also the reason the CAI guys go to the passenger side).
Utah
(Ref: Helm 11-28....for those with a Helm Manual)
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