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1989 Nissan Pathfinder FAILED AIR CARE ON IDLE TEST ONLY

Tiny
DREDF
  • MEMBER
  • 1989 NISSAN PATHFINDER
  • 6 CYL
  • 4WD
  • MANUAL
  • 260,000 MILES
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.
Saturday, December 6th, 2008 AT 12:16 PM

3 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
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
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Saturday, December 6th, 2008 AT 1:29 PM
Tiny
DREDF
  • MEMBER
  • 2 POSTS
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?
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Saturday, December 6th, 2008 AT 2:31 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Idle CO = 3.73 % Fail way too high

Have the coolant temperature and oxygen sensor checked out
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Saturday, December 6th, 2008 AT 2:44 PM

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