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David
David 3/21/2011
1995 Nissan Altima GXE 4Cyl2.4L - Preventive Maintenance
failing smog test @ 25 mph in category NO (PPM),the MAX is 511 im measured 613,what could be the cause??
1 Answer
  • HouseCallAuto
    HouseCallAuto 3/21/2011

    1. Check the EGR valve for proper operation; when opening at idle the engine should stall.

    2. Verify that the engine is at the correct operating temperature.

    3. Update me.
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