emissions gurus

Discussion in '60-Series Wagons' started by rightlane, Aug 16, 2005.

  1. rightlane

    rightlane

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    hc-1.81 standard-4.00 pass
    co-28.33 standard-40.00 pass
    nox-7.33 standard-5.50 fail

    any knowledge would be greatly appreciated here. i've read some threads talking about an egr failure, engine running too hot, bad cat, and the heater control valve. my truck does overheat on the freeway, cools off within 2 miles after the off ramp. i've replaced the entire cooling system except for the water pump ( due to it not weeping ). i did advance the timing, i couldn't see any numbers so i adjusted the ball to the bottom of the window, it was 1/2 way between the needle and the bottom of the window. i'm wondering if the nox failure could be related to the advanced timing? it was normal temp when tested. and how do i check the heat control valve? i'm hoping for an adjustment fix and not a new egr fix. thank you
     
  2. mpetersrx7

    mpetersrx7

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  3. NocalFJ60

    NocalFJ60

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    From what I have learned if you have a high NOX most likely it is a EGR problem. Have you check out the EGR system with the FSM? You can pull a vacuum on the top of the EGR valve while idling and the motor should die. Then that means your EGR valve probably is working but not getting vacuum to open it?

    Was this smog test done at idle?
     
  4. rightlane

    rightlane

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    the test was done while at idle and higher rpm's. i'm minus an fsm, is it an easy explanation for the egr test?
     
  5. NocalFJ60

    NocalFJ60

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