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Question Code P0492

Z16Jim

Regular
Beta
You're 5
Jun 14, 2017
456
924
Port Hope, ON
VetteCoins
4,849
Car
2004 Z16 #123
Province
ON
My car has thrown this code twice in the last week. It says secondary air injection system ( bank 2). This is the first time the car has had the check engine light come on. Any ideas what can be causing this?
 
Reactions: Black 03 Z06
From another forum. Not sure how helpful it is.

The general problem is with the secondary air system check valves. There are two, one on the driver's side of the engine, and one behind the driver's side engine head.
Guess which one is the general problem one! Right, the difficult to reach one. I was happy last year to hear about the WD 40 trick. By spraying the WD into the system and running it a bit, it frees up the stuck valve and the code does not re-occur. If you do a search you will see a lot on this, even someone has dissected one.
 
Reactions: Hotrodron, ddgermann, Black 03 Z06 and 2 others
Ahhhhhhhhhhhh! Dang it. I was reading how the car was working again, then bam!, a post about the code coming back and all my happiness got slapped out of me. .

Hopefully we can find some tips to help you permanently resolve this.
 
Reactions: 12cents and ddgermann
Well the code came back last night, I am going to try more WD-40. If it comes back again I will have to change the check valves.
If I keep driving it could it be damaging anything, or just affecting gas mileage?
 
Maybe it will just have more emissions? Found this explanation of how it may work:

"This system pumps fresh air into exhaust system during cold starts to feed oxygen and exhaust gases. This ensures a more complete burn of harmful emissions – hydrocarbons. After about minute, the system turns itself off."

So if it is stuck shut then it would not let clean air into the exhaust during this phase?
 
Reactions: Hotrodron and ddgermann
Thanks for the explanation Hemicat.
I sprayed some WD-40 down the tube and then started it up and let it idle until it was hot. lets see how long it lasts this time.
 
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