1995 Jeep Cherokee "NO" Smog Fail - 1995 Jeep Gra

Tiny
DMC2005
  • MEMBER
  • 1995 JEEP CHEROKEE
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 13,000 MILES
I am getting following SMOG fail numbers:

NO (PPM)

Speed Max Ave Meas

15 508 149 618 FAIL

25 761 144 455 PASS

Everything else was pass.

I don't drive this car much at all. 130K mi. Had small amount of gas in tank, sitting there for awhile. Transmission slipping a bit so not driving much. Trying to hold off on major repairs for now.

Any advice?

Thanks!

Best,
D
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Friday, January 15th, 2010 AT 3:48 PM

5 Replies

Tiny
RASMATAZ
  • EXPERT
Nox failure -try cleaning out the EGR valve
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Friday, January 15th, 2010 AT 4:04 PM
Tiny
DMC2005
  • MEMBER
Thanks, Rasmataz. I guess I'll be locating the EGR valve next. ;-)

Looking for repair manual.

What do you think about the Smog Pass Additives for NOx reduction?

Thanks!
D
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Friday, January 15th, 2010 AT 4:07 PM
Tiny
DMC2005
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I read where the Jeep Cherokee 1995 doesnt have an EGR valve? Last was '90 models with EGR?
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Friday, January 15th, 2010 AT 4:15 PM
Tiny
RASMATAZ
  • EXPERT
Your engine don't have one just checked it-NOX failures are usually EGR-related, since the EGR system is primarily responsible for reducing oxides of nitrogen. But NOX emissions can also be caused by a bad three-way converter or a computer control system that remains in open loop.
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Friday, January 15th, 2010 AT 4:33 PM
Tiny
DMC2005
  • MEMBER
Thanks, ras

going to try BG 44K fuel additive. Heard of it? Supposedly burns out carbon build up.

Checking out other additives. To 'de-carbonize'

otherwise sounds like it could be:

- cat
- threeway converter
- 02 sensor

etc.

Thanks!
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Friday, January 15th, 2010 AT 4:37 PM

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