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

1995 JEEP CHEROKEE
13,000 MILES • 6 CYL • 2WD • AUTOMATIC
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DMC2005
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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
Jan 15, 2010 at 3:48 PM
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RASMATAZ
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Nox failure -try cleaning out the EGR valve
Jan 15, 2010 at 4:04 PM
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DMC2005
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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
Jan 15, 2010 at 4:07 PM
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DMC2005
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I read where the Jeep Cherokee 1995 doesnt have an EGR valve? Last was '90 models with EGR???
Jan 15, 2010 at 4:15 PM
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RASMATAZ
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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.
Jan 15, 2010 at 4:33 PM
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DMC2005
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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!!!
Jan 15, 2010 at 4:37 PM