Posted by Steve@Advance on June 04, 2016 at 12:07:12 from (107.203.134.67):
I recently bought a 2014 Silverado 1500, 5.3 engine, 43,000 miles.
It ran good when I bought it, but now it has developed a mid range stumble and intermittent rough in gear idle. The stumble feels like lean mixture, driving in the 50 MPH range, try to slightly increase speed, it tends to stumble. Trying to drive a steady speed it wants to fall off, then push the throttle a little, it picks up too much, like it wants to run any speed but the speed I want to go! LOL
This has the V8-V4 system, but watching the dash indicator, when it switches back and forth does not seem to be associated with the stumble. Watching the average MPG, it's very unpredictable. One time I look at it, it's showing 13 MPG. Drive the same route, same conditions, next day it's showing 17!
Seems every theory I try to pursue hits a dead end...
Fuel filter: Doesn't have one that I can find.
Fuel pressure test: Can't find a port. No fuel rails visible, evidently everything is under the intake plenum.
EGR valve: Don't see one... Is there one?
MAP sensor: Don't see one.
Haven't looked at the plugs, but they are supposed to go 100,000 mi. I'm getting no codes. I've looked on Youtube, nothing for that late model, just the older stuff. Looked on the forums, no success.
Upload one or more videos to your post. Photo filesizes should be less than 300K and Videos, less than 2MB. 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 Question for Dads This recent topic from the Tractor Talk discussion board is being highlighted because it is an awesome display of the caliber of individuals that have made this site their own. The young person asking questions received positive feedback and advice from total strangers who "told it like it is" with the care many reserve for their own kids. The advice is timeless... so although it isn't necessarily antique tractor related, it will be prominently displayed in our archives to honor those who have the courage to ask and those who have the courage to respond in an honest, positive manner.
... [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.
