Results 1 to 6 of 6

Thread: smog check

  1. #1
    Join Date
    Jun 2002
    Location
    san jose ca
    Posts
    131

    Unhappy smog check

    Hi I took the sc today for the smog chek and it fail emission ,he said the cats are not good, and he gave me a prize. for cats $620, labor $180. is not that to expensive ?? do you know if there is something less expensive ? please help
    jose.:

  2. #2
    Join Date
    Apr 2005
    Location
    Nor Cal
    Posts
    2,967
    What are the numbers ? What did you fail on ? NOX too high ? HC's ??


    - Dan

  3. #3
    Join Date
    Jun 2002
    Location
    san jose ca
    Posts
    131
    Dan it fail nox the numbers are max 530 meas 945.

  4. #4
    Join Date
    Apr 2005
    Location
    Nor Cal
    Posts
    2,967
    I dont think new Cats will fix your problem either. Maybe they will lower the numbers down a little but not a whole lot.

    Nox = Nitrogen and Oxygen combined at high temperatures, too much Oxygen in your system.

    NOX too high is from too high of temperatures in the combusion chamber - or your engine is running too hot alltogether.


    Usually the EGR lowers the temp by adding extra air ( burned air has less oxygen in it, the hot air displaces the oxygen in your engine ) but your car does not have EGR.

    Timing could affect this, but timing is non-adjustable on these engines also.

    You could also have a vacuum leak making the engine run too lean. I would check for vacuum leaks first, then make sure your o2 sensor, MAF sensor are working good, and Check your Fuel pressure also, too low of fuel pressure will make it run lean also.


    - Dan
    Last edited by Ddubb; 04-04-2012 at 08:01 PM.

  5. #5
    Join Date
    Mar 2006
    Location
    San Jose, Ca
    Posts
    1,806
    Quote Originally Posted by Ddubb View Post
    I dont think new Cats will fix your problem either. Maybe they will lower the numbers down a little but not a whole lot.

    Nox = Nitrogen and Oxygen combined at high temperatures, too much Oxygen in your system.

    NOX too high is from too high of temperatures in the combusion chamber - or your engine is running too hot alltogether.


    Usually the EGR lowers the temp by adding extra air ( burned air has less oxygen in it, the hot air displaces the oxygen in your engine ) but your car does not have EGR.

    Timing could affect this, but timing is non-adjustable on these engines also.

    You could also have a vacuum leak making the engine run too lean. I would check for vacuum leaks first, then make sure your o2 sensor, MAF sensor are working good, and Check your Fuel pressure also, too low of fuel pressure will make it run lean also.


    - Dan
    I will 2nd and 3rd Dan's comment...check for vac leaks, if all good then make sure you aren't running lean, then if all good replace CATS...

    and yes that is far too much $ for CA legal CATS to be installed...I would say $400 out the door $150ea CAT and $100 labor

  6. #6
    Join Date
    Jun 2002
    Location
    san jose ca
    Posts
    131
    hmmmm .Dan remember i have I manual switch to turn the fan on well yesterday when I took the car to smog I forget to turn it on and by the time ,
    I did the car was already to hot
    the technician told me the car fail mainly because the car was running hot.
    jose

Similar Threads

  1. Passive Restraint
    By Pearl Red XR7 in forum Technical Forum
    Replies: 27
    Last Post: 06-16-2009, 06:36 PM
  2. Question on the tranny check balls..
    By v8killr in forum Technical Forum
    Replies: 1
    Last Post: 03-30-2005, 11:02 AM
  3. RPM tach and check engine light
    By nick2003 in forum Super Coupe Club of Ontario
    Replies: 15
    Last Post: 03-10-2005, 01:28 AM
  4. Check this out....Carlisleforums.com....
    By lube70 in forum Non Technical Forum
    Replies: 1
    Last Post: 10-04-2004, 09:38 PM
  5. Check Engine Light
    By 455Poncho in forum Technical Forum
    Replies: 2
    Last Post: 08-05-2002, 01:55 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •