Silverado & Fullsize Pick-ups The Silverado has been one of the best selling trucks in the US for decades, and is truly proven to be "like a rock".

2014 Chevy Silverado
Platform: Truck, GMT 400, 800, & 900

Vortec 454 problems

Old March 7th, 2012, 12:28 PM
CF Beginner
Thread Starter
Join Date: Mar 2012
Posts: 11
Default Vortec 454 problems

Sorry, i'm new so I have no clue where to be posting this but anyway . . . .
I have a 97 vortec 454. When cold it starts and runs good, but after it is warmed up it will idle rough. Also when cruising at highway speeds it will shudder or buck every once and a while. Plugs and wires seem good. No vacuum leaks that I can find, changed pcv valve, and fuel filter. Not throwing any codes or check engine light. Confused, not real sure what to do here.
Thanks, Shayne
sherman943 is offline  
Old March 7th, 2012, 9:29 PM
CF Beginner
Join Date: Mar 2012
Posts: 7

how many miles does it have? i had a the same issue with mine and i discovered it was a bad fuel pressure regulator and my injectors were worn out. the best thing is the injectors can be replaced individual instead of a whole assembly.
BullyDawg is offline  
Old March 7th, 2012, 10:19 PM
CF Beginner
Thread Starter
Join Date: Mar 2012
Posts: 11

about 130,000 miles. It just confuses the hell out of me because it is new enought that this **** SHOULD (i know, they never work like they are supposed too) turn on the service engine light and throw some kind of code
sherman943 is offline  
Old March 8th, 2012, 6:37 PM
CF Active Member
nkh34's Avatar
Join Date: Nov 2011
Location: Idaho
Posts: 177

Is it missing or just running rough. Check your fuel pressure it might be a fuel pump. i didnt get codes either time mine went out and it drove me crazy id just be driving and it would start to run awful bucking and loosing power then catch up in a while. and if it has 130,xxx and you havent done a new pump it is very possible that your problem. if its just flat out missing though it will be a little trickier

Last edited by nkh34; March 9th, 2012 at 6:03 PM.
nkh34 is offline  
Old March 8th, 2012, 7:09 PM
CF Beginner
Thread Starter
Join Date: Mar 2012
Posts: 11

It doesn't seem to be missing but definately running rough AFTER it is warm. I can hear the fuel pump and it sounds normal but I guess that doesn't mean a whole lot. When it's cold it runs nice, idles good.

Last edited by sherman943; March 8th, 2012 at 7:32 PM.
sherman943 is offline  
Old November 3rd, 2014, 12:16 PM
New User
Awaiting E-mail Confirmation
Join Date: Nov 2014
Posts: 1
Default 97 454 cuts out

Hello I'm lost as well it idles rough an cuts out when under a load it's a 5 speed so every gear before u shift has a new distributor, plugs,wires,cap,coil I put fuel pressure gauge on it for a few minutes it holds 48 psi one day it will run decent next day horrible I've been pouring sea foam in th gas no difference about to give up anybody have any ideas an can u check injectors
udiduck is offline  
Related Topics
Thread Starter
Last Post
General Tech
March 9th, 2015 3:00 AM
core shift lsx 454
General Tech
November 18th, 2012 3:35 PM
Silverado & Fullsize Pick-ups
October 31st, 2012 8:43 PM
Silverado & Fullsize Pick-ups
February 6th, 2011 11:48 AM
General Tech
August 15th, 2010 4:08 PM

Thread Tools
Search this Thread
Quick Reply: Vortec 454 problems


Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to and affiliated sites.
  • Ask a Question
    Get answers from community experts
Question Title:
Your question will be posted in: