1994 Isuzu Trooper Failed Smog Test Ca Ppm High

1994 ISUZU TROOPER
200,000 MILES
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ANONYMOUS
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failed smog test ca no ppm high
Mar 21, 2013 at 1:08 PM
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WRENCHTECH
  • ✓Experienced Mechanic
  • 20,760 POSTS
If you mean "Nox", that is caused by high combustion temperatures. You need to look at things like engine temp, ignition timing and EGR operation.
Mar 21, 2013 at 1:13 PM
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