2000 silverado Z71 horrible gas mileage - Page 3 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat
GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat

Go Back   GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat > GM Technical Discussion and Questions > General GM Chat

General GM Chat Chat about all things GM (and related cars). Off-topic stuff should be in the Lounge, and all Model specific mechanical problems should be posted in the proper forum.

LinkBack Thread Tools Search this Thread
Old 02-16-2012, 07:25 PM   #21
Senior Member

Posts like a Turbo
Shaun_300's Avatar
Join Date: Feb 2012
Location: Ottawa, Ontario
Posts: 308
Thanks: 0
Thanked 1 Time in 1 Post
Shaun_300 is on a distinguished road

I would try replacing the 2 pre-cat O2 sensors, they often get lazy in older vehicles and will stick a little lean causing the PCM to add more fuel than required. The trucks are well known for having problems with the O2 sensors. If they go totally dead they'll throw the check engine light on, but if they're just starting to act up they may not until the parameters hit the threshold of throwing a code.
Shaun_300 is offline   Reply With Quote

Similar Threads
Thread Thread Starter Forum Replies Last Post
2015 GMC Sierra Z71 94 olds vert Your Ride: GM Pictures & Videos 9 11-26-2015 12:11 PM
2004 Silverado 1500 Z71 transmission problems phwe9774 GMC/Chevrolet Truck/SUV 6 04-15-2014 02:57 PM
1992 SE bonnie getting horrible gas mileage tbosu1998 1992-1999 6 10-21-2009 08:11 PM
Horrible Mileage......Keep getting check gas cap message.... Spl170s 2000-2005 12 05-08-2008 06:43 PM
FS: 2002 Chevy Silverado Z71 Extended Cab Archon Lounge 1 05-10-2007 02:31 PM

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

All times are GMT -4. The time now is 06:58 PM.