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-   -   at trafflic lights, i can hear some motor kick in and my lights dim. what is this? (http://www.peachparts.com/shopforum/tech-help/173997-trafflic-lights-i-can-hear-some-motor-kick-my-lights-dim-what.html)

ProV1 12-21-2006 10:19 AM
at trafflic lights, i can hear some motor kick in and my lights dim. what is this?
 
once a while when i'm stopped at a traffic light, i can feel/hear some motor kick in for a few seconds and then it stops. when the motor kicks in, my dash cluster lights dim for a split second too.

what is this motor and what does it do? it must be drawing lots of current to dim the cluster lights

GSMITH 12-21-2006 11:03 AM
Can you tell where the motor noise is coming from?

whunter 12-21-2006 11:12 AM
Answer:
 
Normal operation.

This is your electric auxiliary cooling fan turning on.





Have a great day.

ILUVMILS 12-21-2006 12:11 PM
It's probably the secondary air injection pump. Some people say it sounds like a vacuum cleaner. Is it a really high-pitched whine?

whunter 12-21-2006 01:28 PM
Hmmm
 
Quote:
Originally Posted by ILUVMILS (Post 1364552)
It's probably the secondary air injection pump. Some people say it sounds like a vacuum cleaner. Is it a really high-pitched whine?
Possible:
I only had one bad enough to dim the lights, and it shorted seven days later. :eek:

ProV1 12-21-2006 02:20 PM
Quote:
Originally Posted by ILUVMILS (Post 1364552)
It's probably the secondary air injection pump. Some people say it sounds like a vacuum cleaner. Is it a really high-pitched whine?


yes, sorta sounds like a high pitched whine. is that bad?

ILUVMILS 12-21-2006 06:17 PM
Quote:
Originally Posted by buckwheat (Post 1364805)
On my motor's program (119), air pump is only on during initial start for 60 seconds. Blows more O2 into the cats to help them come up to temp. I have never found a trigger for this at other times - please help me verify. And you're right, it's quite similar to a vacuum cleaner/blower.
Air injection does indeed take place following cold-engine start, but the system self-test takes place after the coolant temperature is above 60C, and the vehicle comes to a stop.


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