1984 Isuzu Truck smog

1984 ISUZU TRUCK
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JBACON
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Engine Mechanical problem
1984 Isuzu Truck 4 cyl Two Wheel Drive Manual

my pu passes all but the 15 mph no witch are 300 to high what are the possible causes
Sep 4, 2009 at 5:00 PM
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RASMATAZ
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What gases did it flunked? HC/CO/CO2/O2/NOX????????
Sep 4, 2009 at 5:08 PM
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JBACON
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it failed on the no(ppm) at 15 mph and passed all outhers
Sep 5, 2009 at 2:23 PM
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RASMATAZ
  • ✓ASE Certified Mechanic
  • 75,992 POSTS
  • ASE Certified Mechanic
Nox -check and clean out the EGR valve might not be opening.
Sep 6, 2009 at 2:27 PM
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