1989 Nissan Pathfinder FAILED AIR CARE ON IDLE TEST ONLY

1989 NISSAN PATHFINDER
260,000 MILES • 6 CYL • 4WD • MANUAL
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DREDF
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I have tried to get my car tested for air care but failed on idle test only and wondering what would be the cause of the problem.All other test passed with flying colors.
Dec 6, 2008 at 12:16 PM
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RASMATAZ
  • ✓ASE Certified Mechanic
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I have tried to get my car tested for air care but failed on idle test only

Post the readings maybe I can help which one -HC/CO/O2/CO2/NOX
Dec 6, 2008 at 1:29 PM
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DREDF
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[quote:b7431ce35e="rasmataz"]I have tried to get my car tested for air care but failed on idle test only

Post the readings maybe I can help which one -HC/CO/O2/CO2/NOX[/quote:b7431ce35e]

My test results:

2008-03-17 13:49:38 261,000 Kilometers

Driving HC = 22 ppm Pass
Driving CO = 0.15 % Pass
Driving NOx = 47 ppm Pass
Idle HC = 143 ppm Pass
Idle CO = 3.73 % Fail

There must be some intermittent problem as over the years of testing .It has always been the Idle Test Failing and when it passes it's reading is very low from .026 to 1.49 readings
Any Ideas??
Dec 6, 2008 at 2:31 PM
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RASMATAZ
  • ✓ASE Certified Mechanic
  • 75,992 POSTS
  • ASE Certified Mechanic
Idle CO = 3.73 % Fail way too high

Have the coolant temperature and oxygen sensor checked out
Dec 6, 2008 at 2:44 PM
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