Can't pass smog test

Tiny
FUNHOUSE34
  • MEMBER
  • JEEP CHEROKEE
Hi, I have a 1995 Jeep Cherokee and I can't pass the smog test.
I had the O2 sensor changed and still a no no.
Any ideas what it could be?
Do you
have the same problem?
Yes
No
Wednesday, December 6th, 2006 AT 10:01 PM

2 Replies

Tiny
CARUNDELL
  • MEMBER
Hey funhouse,
Please post the "gas readings" you got from the inspection station and we can go from there.

Regards,

Chris
Was this
answer
helpful?
Yes
No
Thursday, December 7th, 2006 AT 3:40 AM
Tiny
FUNHOUSE34
  • MEMBER
Well, I am no expert but here are the readings :

Test at 15 miles an hour : Failed Test
RPM 1597
CO2 % meas 14.80
O2 % Meas 0.04
HC (PPM) Max 88, AVE 18, MEAS 19
CO2 % Max 0.64, AVE 0.05, MEAS 0.09
NO (PPM) Max 508, AVE 149, MEAS 618

Looks like I passed the CO2 test, and the HC (PPM) test but failed the NO(PPM) test were they measured 618 where the max allowed is 508

Test at 25 miles an hour : Passed Test
RPM 1539
CO2 % meas 14.80
O2 % Meas 0.02
HC (PPM) Max 53, AVE 12, MEAS 16
CO2 % Max 0.78, AVE 0.04, MEAS 0.06
NO (PPM) Max 761, AVE 144, MEAS 550

So I passed at the 25MPH test but failed the 15 MPH test.
I passed all the emission Control System Visual Inspection/Functional checklist Results

any ideas why I failed the NO(PPM) test at 15 MPH?

Thanks
Was this
answer
helpful?
Yes
No
Wednesday, December 13th, 2006 AT 12:00 AM

Please login or register to post a reply.

Recommended Guides