Posted by mattofvinings on December 09, 2008 at 15:51:24 from (67.142.161.35):
In Reply to: OT Chevy 4.3 posted by Deere40 on December 08, 2008 at 18:10:11:
1987 is firmly in OBD-1...which means the emission control devices (really fuel-injection control devices) are "open loop". The ECM in this vehicle would not know if you used the EGR valve to pump up an exhaust-liftall 8-)
The main goal of OBD-2 was to have "error proofing" of the primary sensors to ensure they function correctly. Much of the double-checking responsibility falls to the O2 sensors, especially the one after the catalyst.
Fuel injection is the main emission control device when you look at it, while this seems impossible, it allows a precise control of air-fuel ratios....so the catalyst can burn up all three major pollution "chemicals". The catalyst is effective on all three only in a narrow window...get just a little outside the "sweet spot" and the efficiency on 1 or more pollutants falls off the table.
We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today. [ About Us ]
Today's Featured Article - Choosin, Mounting and Using a Bush Hog Type Mower - by Francis Robinson. Looking around at my new neighbors, most of whom are city raised and have recently acquired their first mini-farms of five to fifteen acres and also from reading questions ask at various discussion sites on the web it is frighteningly apparent that a great many guys (and a few gals) are learning by trial and error and mostly error how to use a very dangerous piece of farm equipment. It is also very apparent that these folks are getting a lot of very poor and often very dangerous advice fro
... [Read Article]
All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy
TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.
