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Old 02-22-2018, 08:13 AM
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mickfree
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Default Newbie trying learn!

I have a 99 vette and I notice I have a hose that is connected to something under my driver side headlight, lead back to the firewall but it's plugged off. Any clues??

Thx

Mick
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Old 02-22-2018, 08:41 AM
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runner140*
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Originally Posted by mickfree View Post
I have a 99 vette and I notice I have a hose that is connected to something under my driver side headlight, lead back to the firewall but it's plugged off. Any clues??

Thx

Mick
Could be the air check valve system. Some of us had it programed out.
Just a guess. Part of the emissions system.
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Old 02-22-2018, 08:45 AM
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Originally Posted by runner140* View Post
Could be the air check valve system. Some of us had it programed out.
Just a guess. Part of the emissions system.
Thanks sooo much for your reply.
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Old 02-22-2018, 09:26 PM
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A pic here might help with an answer.
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Old 02-22-2018, 10:31 PM
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The air pump is mounted in that area by the left headlight. Maybe the pump doesn't function anymore and someone did a halfassed modification to the system.
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Old 02-22-2018, 11:49 PM
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I bought the car used and you may be right. But I just trying understand purpose of this airbox. I another member suggested it maybe related to emissions.
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Old 02-23-2018, 12:39 AM
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Yello95
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Originally Posted by mickfree View Post
I bought the car used and you may be right. But I just trying understand purpose of this airbox. I another member suggested it maybe related to emissions.
PM Bill Curlee....he would know for sure...don't ask him about heart surgery though...submarines yes...maybe give him some more details to pin it down
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Old 02-23-2018, 07:16 AM
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Thanks I will take pics and post soon.
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Old 02-23-2018, 12:03 PM
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Default picture of black box

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Old 02-23-2018, 08:32 PM
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Mike98SilVert
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That the air injection pump.
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Old 02-23-2018, 08:59 PM
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mickfree
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Originally Posted by Mike98SilVert View Post
That the air injection pump.
ok cool I assume emissions related?
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Old 02-23-2018, 09:55 PM
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Mike98SilVert
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Yes it's emissions related. It's a pump that injects fresh air into the exhaust stream to help to burn any unburned and partially burned fuel in the exhaust to reduce tailpipe emissions. Also referred to as a smog pump or secondary air pump.

Principle of the secondary air system:
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Old 02-23-2018, 11:18 PM
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Wow Thanks for taking the time to supply this info.
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Old 02-24-2018, 12:03 AM
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Interestingly, that is the air pump of which I mentioned. In my own car I was having problems with the system setting codes so I had the computer tuned to delete it and removed all the components. My car still passes New Jersey inspection.
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