82 Failed Emissions..Help
Thread Starter
Racer
Joined: Jul 2001
Posts: 429
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From: Norfolk Va VA
82 Failed Emissions..Help
I have an Stock 82 Crossfire and it failed emisions... the NOX was fine but the other numbers were high... if anyone has any ideas what it may be.... I dont have a lot of time for trouble shooting right now so I am trying to get a quick fix..... Also I have to prime it when I first start it in the morning.... I think I may have an injector leaking but I am not sure weather this would cuase it to fail... rjs82vette@hotmail.com
Safety Car
Joined: Aug 2000
Posts: 3,711
Likes: 43
From: San Antonio TX
Re: 82 Failed Emissions..Help (rjs82vette)
A leaking injector would cause a failure in CO, but not necessarily the HC. I assume your NOX was well below specs (as is usually the case when the engine is rich). Get the fuel system professionaly cleaned, or if you have the time, put a couple of tanks of Techron through the system to help clean the injectors and valves. Before inspection, install new plugs, change your filters and oil and make sure the engine has been operating for an hour or so to get the temps at optimum.
Racer
Joined: Jan 2002
Posts: 375
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From: Palm Bay FL
Re: 82 Failed Emissions..Help (rjs82vette)
Is the smog pump still operational?
I agree with gerry72, replace both air filters, change oil and oil filter, change spark plugs, and use high octane fuel.
I assume the timing is correct. I know it's computer controlled but if the knock sensor or other timing related sensor is malfunctioning, this could cause the timing to be off resulting in bad emissions. The fact that you have to prime it in the morning tells me you definitly have something wrong with fuel intake. In other words, don't be fooled into thinking the car has only one problem.
Good luck!
I agree with gerry72, replace both air filters, change oil and oil filter, change spark plugs, and use high octane fuel.
I assume the timing is correct. I know it's computer controlled but if the knock sensor or other timing related sensor is malfunctioning, this could cause the timing to be off resulting in bad emissions. The fact that you have to prime it in the morning tells me you definitly have something wrong with fuel intake. In other words, don't be fooled into thinking the car has only one problem.
Good luck!
Race Director
Joined: Dec 1999
Posts: 16,945
Likes: 9
Re: 82 Failed Emissions..Help (Calm Screamer2)
Your car is running rich. The egg style injectors are not prone to leaking, it's much more likely a false O2 signal. This can be caused by the AIR system. If the checkvalves on the headers are leaking or if the 2nd diverter valve doesn't switch to the catalytic converter oxygen will be introduced into the exhaust BEFORE the O2 sensor, giving a false lean signal. The ECM will enrich and you'll never pass emissions. An exh. leak in front or shortly after the O2 sensor (or a leaking O2 sensor bung) will give similar results. The stock shorty headers have a "knuckle" connection to the Y pipe. They often leak there. If there are traces of carbon on the pipe check it, if exh. gas can flow out air can come in!
Marck
Marck
Racer
Joined: Jan 2001
Posts: 405
Likes: 0
From: Fresno
Re: 82 Failed Emissions..Help (Twinnie)
Now Im confused. I thought air was injected into the headers from the smog pump. Does exhaust flow out of the headers up through the little tubes connected to each port to somewhere else? :confused:
Burning Brakes
Joined: Oct 2001
Posts: 860
Likes: 40
From: Woodforest
Re: 82 Failed Emissions..Help (TJKirby82CE)
The flow is from AIR pump to headers. I agree with the the rich scenario. My 82 passed without the AIR working and with a gutted cat. It boils down to having your cars temp up at the inspection and not running too rich or too lean.
Race Director
Joined: Dec 1999
Posts: 16,945
Likes: 9
Re: 82 Failed Emissions..Help (TJKirby82CE)
Oh sorry about the unclear statement about the tubes. You're correct, air is pumped into the headers and the valves keep exh. gas from flowing back. If the valves are shot exh gas CAN be pumped back and mess up the valve so that it does NOT switch to the cat anymore, I recently fixed an 82 for a friend who had exactly that problem. His diverter valve was burnt up.
Marck
Marck
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Thread Starter
Racer
Joined: Jul 2001
Posts: 429
Likes: 0
From: Norfolk Va VA
Re: 82 Failed Emissions..Help (rjs82vette)
I didnt have the test results with me when I posted...
HC ppm 278 @ 15 MPH 242 @ 25 MPH
CO% 2.41 @ 15 MPH 2.31 @ 25 MPH
NO ppm 281 @ 15 Mph 319 @ 25 MPH
Thanks for all the help.... I will check it out this week end... If I'm not working...
HC ppm 278 @ 15 MPH 242 @ 25 MPH
CO% 2.41 @ 15 MPH 2.31 @ 25 MPH
NO ppm 281 @ 15 Mph 319 @ 25 MPH
Thanks for all the help.... I will check it out this week end... If I'm not working...