Question Code P0492

Z16Jim

Regular
Beta
Jun 14, 2017
366
680
Awards
5
Port Hope, ON
0
VetteCoins
1,420
Car
2004 Z16 #123
Province / State
Ontario
  • Ontario
  • C5
  • You're Celebrated
  • You're a Regular
  • You're Liked
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?
 
  • Like
Reactions: Black 03 Z06

hemicat

Regular
Nov 5, 2018
215
355
Awards
6
Dalmeny
3
VetteCoins
8,975
Car
2003 Z06
Province / State
Saskatchewan
  • Hot Chili
  • SK
  • You're Celebrated
  • C5
  • You're a Regular
  • You're Liked
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.
 

XFIRE82

Power User
Oct 24, 2014
1,554
2,033
Awards
9
Krydor, Saskatchewan
3
VetteCoins
23,082
Car
1982 , 1993
Province / State
Saskatchewan
  • C3
  • C4
  • SK
  • You're Celebrated
  • Spotlight Award
  • Hot Chili
as Maxwell Smart would say : " the 'ol spray in the hole WD40 trick " .........:thumbs:........
 

Riley P

Staff member
Moderator
Power User
Jan 11, 2009
10,782
1,523
Awards
7
Saska-ba-toon!
0
VetteCoins
3,504
Car
2000 Z51
Province / State
Saskatchewan
  • C5
  • SK
  • You're 5
  • 10 Years
  • You're a Regular
  • King of the Post
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. :D.

Hopefully we can find some tips to help you permanently resolve this.
 

Z16Jim

Regular
Beta
Jun 14, 2017
366
680
Awards
5
Port Hope, ON
0
VetteCoins
1,420
Car
2004 Z16 #123
Province / State
Ontario
  • Ontario
  • C5
  • You're Celebrated
  • You're a Regular
  • You're Liked
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?
 

hemicat

Regular
Nov 5, 2018
215
355
Awards
6
Dalmeny
3
VetteCoins
8,975
Car
2003 Z06
Province / State
Saskatchewan
  • Hot Chili
  • SK
  • You're Celebrated
  • C5
  • You're a Regular
  • You're Liked
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?
 

Z16Jim

Regular
Beta
Jun 14, 2017
366
680
Awards
5
Port Hope, ON
0
VetteCoins
1,420
Car
2004 Z16 #123
Province / State
Ontario
  • Ontario
  • C5
  • You're Celebrated
  • You're a Regular
  • You're Liked
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.
 

carol w

Casual User
Dec 28, 2011
15
1
Awards
2
Toronto, Ontario
0
VetteCoins
35
Car
2003
  • C5
  • You're 5
This may sound bizarre but I’m just putting it out there. Is it possible that there’s some gunk of sorts that continues to stick?. Perhaps some carb cleaner to get rid of the gunk then the WD?
 
  • Like
Reactions: ddgermann

Users Who Are Viewing This Thread (Users: 0, Guests: 1)