emissions nox gas

1995 GMC JIMMY
150,000 MILES • 6 CYL • 4WD • AUTOMATIC
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MSGTMORGAN
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  • 1 POST
1995 gmc jimmy nox gas to high on emissions test! Do I have a bad or pluged egr valve! msgtmorgan
Jan 28, 2011 at 7:00 PM
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JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,240 POSTS
Either one could cause it. If the vehicle hasn't been tuned up for a long time, that would be a good place to start. Also, have the oil changed before the next test if it is due or near due. If a tune up doesn't help, then I would remove the EGR and check to make sure it isn't carboned as well as the intake where it mounts.
Feb 23, 2011 at 11:26 AM
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