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Old 11-20-2017, 08:53 AM   #1
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Originally Posted by Quadcammer View Post
1st is likely lifters pumping up.

2nd is your secondary air injection.

Third sounds weird, not sure what that is, but i doubt its harmful
So what shall we do about the SAI? Replace it and if so, how much ?
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Old 11-20-2017, 09:10 AM   #2
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Originally Posted by Lacostas View Post
So what shall we do about the SAI? Replace it and if so, how much ?
The SAI pump should only run aprox. 90 seconds on cold start up. Its a distinct sound different from the engine compartment fan.
The engine compartment fan should only come on with much heat(don't know the degree value) within the engine bay. You will feel the air flowing through the right side vent for the fan but not the SAI.
Not sure what tells the SAI to come on. I know If I crank the engine on a cold start but turn it off before it starts, my SAI will then not come on for that cold start

You certainly don't need to replace if it runs for the initial 90 seconds. They are expensive
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Old 11-20-2017, 09:25 AM   #3
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Originally Posted by kk2002s View Post
The SAI pump should only run aprox. 90 seconds on cold start up. Its a distinct sound different from the engine compartment fan.
The engine compartment fan should only come on with much heat(don't know the degree value) within the engine bay. You will feel the air flowing through the right side vent for the fan but not the SAI.
Not sure what tells the SAI to come on. I know If I crank the engine on a cold start but turn it off before it starts, my SAI will then not come on for that cold start

You certainly don't need to replace if it runs for the initial 90 seconds. They are expensive
Thanks. Yes it runs for almost a minute or so. But it's weird cause only until recently it was not making any sounds. After I replaced my AOS, it started whining
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Old 11-20-2017, 10:07 AM   #4
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Originally Posted by kk2002s View Post
The engine compartment fan should only come on with much heat(don't know the degree value) within the engine bay. You will feel the air flowing through the right side vent for the fan but not the SAI.
Engine Compartment Purge Fan
To reduce the temperature of the engine compartment, a fan actuated by the DME is installed behind the ventilation grille of the passenger side rear fender vent.

If the fan is turned on, fresh air is fed into the engine compartment. There is a temperature sensor mounted in the engine compartment to provide temperature input to the DME.

Standard Operation:
1. With engine running or ignition on:
If the engine temperature is higher than 102° C and the engine compartment temperature is higher than 60°C, the engine compartment fan is switched on for 30 seconds by the DME control unit and the engine compartment is thus ventilated.
2. With the engine off and vehicle is stationary:
If the engine compartment temperature is higher than 60° C when the engine is switched off (ignition off) or if the engine stalls (engine speed: 0 rpm), the engine compartment fan is switched on for 20 mins.

Note: If the engine temperature has not dropped below 80.25°C after the engine compartment fan has been running for 25 seconds, a fan fault is registered and the coolant level warning lamp is activated (flashes).
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