The message to which you are about to reply is shown first. GO TO REPLY FORM



 VIEW    REPLY TO THIS MESSAGE    PRINT   SAVE 

How do I bring my NOx grams per a mile down? (Massachusetts inspection sticker)!!! PLEASE HELP! 700

posted by  someone claiming to be JimL on  Fri Jul 23 03:10 CST 2004 [RELATED]

If the HC and CO are well below the limits then I would say that the cat is doing its job.

High NOx is caused by running hot and lean.

You need more fuel and/or less air and/or less advanced ignition timing.

I would suggest:

1. Set the base idle speed correctly with the IAC out of the circuit and car idling only on the throttle body bypass screw.

2. Check timing - retarding it will help.

3. Replace the fuel filter to help richen mix.

4. Replace O2 sensor to help richen mix.

5. Make sure cooling system is working well.

6. Make sure dist cap and rotor are in good shape and not corroded.

I don't see how driving the car for 20 minutes before testing to get everything good and hot would help the NOx, but maybe I am missing something.






USERNAME
Use "claim to be" below if you don't want to log in.
PASSWORD
I don't have an account. Sign me up.
CLAIM TO BE
Use only if you don't want to login (post anonymously).
ENTER CAPTCHA CODE
This is required for posting anonymously.
OPTIONS notify by email
Available only to user accounts.
SUBJECT
MODEL/YEAR
MESSAGE

DICTIONARY
LABEL(S) +
IMAGE URL *
[IMAGE LIBRARY (UPLOAD/SELECT)]

* = Field is optional.

+ = Enter space delimited labels for this post. An example entry: 240 muffler


©Jarrod Stenberg 1997-2022. All material except where indicated.


All participants agree to these terms.

Brickboard.com is not affiliated with nor sponsored by AB Volvo, Volvo Car Corporation, Volvo Cars of North America, Inc. or Ford Motor Company. Brickboard.com is a Volvo owner/enthusiast site, similar to a club, and does not intend to pose as an official Volvo site. The official Volvo site can be found here.