High Pitch Whine at Start Up - Page 4 - Smart Car Forums
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post #31 of 33 (permalink) Old 01-22-2009, 08:56 PM
 
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Quote:
Originally Posted by intake172 View Post
It is the catilayic converter fan. since the engine is in the rear there is not enough air circulation in the back on the cat. so they put a fan to help cool it down. In the morning on the first start up of the day they cars computer system does a self check on all important functions including the cat fan. it should do a self check with all 3 speeds ( low, med, high) then you should hear a relay click under the dash and the fan will shut off. All is normal operation. You just wont ever notice this fan when you are driving down the road because of other noises.
I assume this is a joke... so one more time:
There is no "3-speed cooling fan" for the catalytic converter on this car or any car. This is an electrically driven pump that injects air into the exhaust stream to help complete the combustion of excess fuel during rich mixture conditions (cold start-up), and as a result also helps the catalytic converter warm-up sooner and work more effectively. Many other cars have been fitted with similar smog air pumps since the 1970s, but they were belt-driven instead of electric/computer controlled.

Last edited by PeteInLongBeach; 01-22-2009 at 08:59 PM.
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post #32 of 33 (permalink) Old 01-22-2009, 10:33 PM
 
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I think I know what the problem is.
Does it sound like this? (in a nasal tone)... TAKE ME SHOPPING!

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post #33 of 33 (permalink) Old 02-07-2019, 12:01 PM
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Isn't the right next to the conuttion valve or upside down from the IoooosmaPhate ..or on the opposite side of gronkensnarflife. yea thats it.
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