Emissions nox gas

Tiny
MSGTMORGAN
  • MEMBER
  • 1995 GMC JIMMY
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 150,000 MILES
1995 gmc jimmy nox gas to high on emissions test! Do I have a bad or pluged egr valve! Msgtmorgan
Saturday, January 29th, 2011 AT 3:00 AM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 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.
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Wednesday, February 23rd, 2011 AT 7:26 PM

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