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Hello I will help,
Is there evidence that the engine is running rich? Increased fuel consumption, black spark plugs etc.?
Was the vehicle warmed up before you started it in the garage?
What is the brand and model number of the detector?
Sorry I am unable to speak on the phone.
The catalytic converter has to be hot to operate, you will still get CO out the exhaust but if you have it warm and run the engine at 2000 rpm it should not be much.
Do you know the model and brand of the detector so I can see how sensitive it is? If it is for home use it will be too sensitive to use for exhaust monitering.
OK, I see what detector you have. That is a good one. What readings were you seeing and were you around the vehicle or in the exhaust stream?
That is pretty high. You had the cat hot and were holding the RPMs up?
Do you have the results from the smog test?
You have to pre heat it like they do for the emission test, A cold (below 600F) cat will not operate and the exhaust just passes through then at idle it will be higher.
Do you have a percentage reading rather than the PPM reading?
Do you have the results from the smog test? It should show what they measured.
You might find this article interesting about how much CO a vehicle will produce
Click here for article
This one as well
Do those explain what is going on for you?
Yes, CO will be produced anytime the vehicle is running and you cannot run an engine in a closed garage even for a short time. You must start it with the door open and pull outside at once.
The amount of CO will be reduced but never to a safe to breathe level even after warming up.
The second article speaks directly to running a vehicle inside a garage.
Please let me know what further questions you have about this
As the article states it is not possible to get a good reading in the garage, simply too much CO is produced and it will damage the sensing cell in the detector. I think what you are seeing is normal and the fact you passed the emission test bears out that the vehicle is operating properly. You did prove the point that you can't run an engine inside safely.
Let me know how I can help
As long as you passed the emission test you took it is fine. If you read through those articles it explains that those levels are normal. You have to be running the engine at very high idle for the cat to operate and reduce the CO but even then you will still see those high readings.
Let me know if that is clear
2000 RPM allows enough heat from the exhaust to reach the cat and cause it to start working. You have to hold the RPMs at that level while you check but again you are not going to see safe to breathe levels out the exhaust ever. They will always be that high just not as high as they would be without the catalytic converter.
As I posted above I am unable to speak on the phone.
The emissions failed for evaporative emissions then you passed after the cap was installed. That is a different system from the exhaust emissions that you are testing for CO. You might go back to the shop that installed the exhaust to have them check it for leaks if you are concerned but everything you have told me so far is normal operation and I don't see anything to be concerned about
Please let me know if you have further questions. I think you were expecting another result but you are measuring normal emissions from a '92 4runner
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