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| Auto Repair Information at Smogsite.com |
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Automotive Repair Articles |
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| Item:
Exhaust Gas Analysis Examples |
SKU:
e-egeg
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Price: $1.59
Delivery time: Instant!
(no matter where you are in the world!)
(Add to Cart button is located at the bottom of
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| Excerpt:
"This first set of examples shows four gas readings
(HC, CO, CO2 and O2) during the two speed idle test commonly
run on the BAR 90 machine in a basic smog test area. Some
tests were only run at the low speed idle to save the catalytic
converter. These are real readings from real cars.
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Normal
clean emissions
This is a '91 Mitsubishi Galant, 2.0 fuel
injected, with no air injection. These are the clean
emissions of a good system and great catalytic converter.
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Idle
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Cruise
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HC
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1 ppm
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5 ppm
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CO
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0.04 %
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0.01 %
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CO2
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15.5 %
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15.4 %
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O2
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0.1 %
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0.1 %
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Clean
emissions with air injection
This '81 Plymouth Reliant 2.2L has air injection.
Notice the high O2 (7.4 - 7.8 %) but the CO2 is lower
(9.6 - 9.4 %) The added air (which has lots of O2) has
diluted the CO2.
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Idle
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Cruise
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HC
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28 ppm
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30 ppm
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CO
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0.01 %
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0.04 %
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CO2
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9.6 %
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9.3 %
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O2
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7.4 %
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7.8 %
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Lean Misfire
This '78 Volvo with fuel injection has
a massive intake air leak. In this lean misfire HC
is at the max. The lean air/fuel ratio makes it hard
to burn all ..."
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Idle
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HC
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2000 ppm
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CO
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0.63 %
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CO2
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9.5 %
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O2
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7.4 %
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The article contains
these sections:
- 5 other Four Gas Reading Examples (8 in total)
- 5 Five Gas Reading Examples
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