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This means that there is too much unburned gasoline coming out of the tailpipe. Possible causes:
1-Low temperature. Check your engine coolant temperature. It should be between 195 degrees and 220 degrees. If it is below 195, replace the thermostat.
2-Misfire. Does the car vibrate when accelerating? If so, do a misfire diagnosis, then repair the problem.
3-Overly rich fuel mixture. If your check-engine/SES light comes on, start there. Otherwise, check for any exhaust system leaks that can fool the oxygen sensor.
4-Damaged or cold catalytic converter. To be sure the converter is fully warmed up before the emissions test, drive the car for at least ten minutes. While waiting for the test do not shut the car off. Immediately before testing, use the accelerator pedal to hold engine speed at about 2000 RPM for 30 seconds to a minute. If you can hit the catalytic converter (when cold) with your hand and it makes a clunk noise, replace the converter and all pipes from it to the tailpipe, and the muffler as well. Beyond that, testing of the catalytic converter requires a gas analyzer which is a very expensive tool.
5-Malfunctioning AIR system, if equipped. This doesn't happen much, so I won't go into detail on it. It's only likely to affect emissions testing if the test is an idle test or 2500RPM test. This will not affect a dynamometer test.
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How do you fix a 1995 Chevrolet Lumina emission test fail NO x ppm reading fail?
Answering "How do you fix a 1995 Chevrolet Lumina emission test fail NO x ppm reading fail?"
The NO level was high and caused a fail when you took your 93 Chevy Lumina Euro to have an emission check what can vcause this?
EGR may not be working.
Why does Water drip under 1993 Chevy Cavalier?
Because your fail
Can a bad air conditioning unit cause emission test to fail?
No
How would a P0440 code affect a 2000 Chevy S-10?
P0440 = EVAP Emission Control System Malfunction. The Check Engine light would illuminate and you would fail an emissions test.
What happens if you dont fix catalytic converter?
You will fail an emission test and worse case, the engine will fail to run if the cat gets plugged up.
If you remove the inner core of a catalytic converter in a truck will it improve sound and performance?
It may do that but it will surely fail all emission standards. If you fail that then you can't drive it anyway.
What happens if you remove catalytic converter on 06 z71?
Check engine light will probably come on and you will fail the emission tests.
What does fail fuel 66 mean in your 1993 xj6?
code42
Can you fail an emission test if your check engine light is not working?
yes they but it on a scan tool and they should tell you what the problem is and what needs to be done.
Can the battery going dead in a '93' Lumina cause some sort of computer error where the damper doors on the air system fail to operate?
Not usually.
Why don't I have dashboard lights in a 1992 Chevy Lumina?
If you don't have dashboard lights, check the tail light. They often go out at the same time. Most U.S. manufacturers put them both on the same circuit so that we'll notice when the tail lights fail. Check the fuses first, if that's not it, start tracing back to the switch.
