Posted by Determined on March 07, 2020 at 07:24:29 from (216.130.212.201):
In Reply to: GM OBD1 Question posted by jeff nwoh on March 06, 2020 at 13:50:40:
Been a while since I played with TBI trucks so if I am off slightly don't shoot me.
TBI and high idle, throttle body gaskets are a common problem.
A sticky PCV valve or cracked/disconnected hose to vapor cannister will give you a high idle condition as well.
On a 95 the computer is not able to tell much about the EGR valve, all it does is wait until the engine is warm and when the driving and RPM parameters are met it switches the solenoid to control the vacuum to the valve, it then wants to see a change in what the oxygen sensors readings are and the corresponding fuel adjustments.
If it does not see a change it assumes there is an EGR fault.
A vacuum leak can prevent the valve from cycling the computer will not see a change so it reports a fault.
In addition when a large vacuum leak exists the computer will be trying to control the high RPM's by closing the IAC as much as it can in an attempt to stabilize the air fuel ratio, the readings it is getting from the sensors at this point are not representative of what parameters it is expecting to see and the list of codes grow and grow.
Upload one or more videos to your post. Photo and video filesizes should be less than 8MB. Formats allowed are gif, jpg, png, ogg, mp4, mov, and avi. Be sure to use filenames without spaces or special characters, and filetypes of 3 digits lower case.
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 - A Lifetime of Farm Machinery - by Joe Michaels. I am a mechanical engineer by profession, specializing in powerplant work. I worked as a machinist and engine erector, with time spent overseas. I have always had a love for machinery, and an appreciation for farming and farm machinery. I was born and raised in Brooklyn, New York. Not a place one would associate with farms or farm machinery. I credit my parents for instilling a lot of good values, a respect for learning, a knowledge of various skills and a little knowledge of farming in me, amo
... [Read Article]
Latest Ad:
1964 I-H 140 tractor with cultivators and sidedresser. Starts and runs good. Asking 2650. CALL RON AT 502-319-1952
[More Ads]
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.