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Smog fail on NO

Tiny
MKELEE
  • MEMBER
  • 1991 ISUZU TROOPER
  • 90,467 MILES
Would not pass smog I ended up replacing headgasket, valve job, valve lashcomplete tune up, all new vacuum lines and pcv, sensors ect. It still failed just barely, it failed NO
max is 704 @ 15 mph it measured 854
max is 606 @ 25 mph it measured 638
tech checked egr working fine
tech suggested changing timing from 13 degrees to 9 degrees
Any Ideas?
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Tuesday, February 21st, 2012 AT 12:47 AM

3 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Check the EGR valve, a problem with it will caused the Nox -oxides of nitrogen to go high due to excessive combustion temperature
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Tuesday, February 21st, 2012 AT 12:51 AM
Tiny
MKELEE
  • MEMBER
  • 15 POSTS
The tech checked it out using a vacuum pump/gauge said it was working
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Tuesday, February 21st, 2012 AT 1:15 AM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Tell him check the catalytic converter, oxygen and coolant temperature sensors-
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Tuesday, February 21st, 2012 AT 1:29 AM

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