intermittent stumble, '91 454 TBI - Hot Rod Forum : Hotrodders Bulletin Board -- Hot Rod Forum

Register FAQ Search Today's Posts Unanswered Posts Auto Escrow Insurance Auto Loans
Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Engine
User Name
lost password?   |   register now

LinkBack Thread Tools
  #1 (permalink)  
Old 01-22-2006, 01:26 AM
Registered User
Last photo:
Join Date: Jun 2005
Location: San Andreas, Ca.
Posts: 28
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
intermittent stumble, '91 454 TBI

Hi all,
my everyday is a '91 Suburban with a TBI 454. Within the last 2 months it has had about 6-10 instances where the engine rpm will either "hunt" (off idle only), or when trying to hold it at a steady cruising speed rpm it will stumble until you bring the rpms above that point. I'm not getting any trouble codes, and have no other engine-related problems. I am suspecting either the throttle position sensor or the idle air controller, but would prefer not to just start randomly buying parts in the hopes it gets resolved.

Any helpful suggestions are much appreciated ~

Attached Thumbnails
Click image for larger version

Name:	sub_002.JPG
Views:	110
Size:	56.9 KB
ID:	9399  

Reply With Quote Quick reply to this message
Sponsored Links
  #2 (permalink)  
Old 01-22-2006, 02:04 AM
97Z28's Avatar
NTI Grad.
Last photo:
Join Date: Jul 2005
Location: Chardon, Ohio
Age: 35
Posts: 607
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
check and see if the EGR valve is caked with carbon. remove it and clean it and see if that works...
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 01-22-2006, 03:08 AM
predator carb guru's Avatar
Mark Goulette
Join Date: Feb 2005
Location: Conifer, Colorado
Posts: 149
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
check for vacuum leaks at the base of the throttle body too.......very common on those.............just spray some carb cleaner around the base and see if the idle changes................gaskets are easy to change and fairly cheap.............
Reply With Quote Quick reply to this message

Recent Engine posts with photos

Quick Reply

Register Now

In order to be able to post messages on the Hot Rod Forum : Hotrodders Bulletin Board forums, you must first register.
Please enter your desired user name (usually not your first and last name), your email address and other required details in the form below.
User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:
Please select your insurance company (Optional)


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools

Posting Rules
You may post new threads
You may 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

Similar Threads
Thread Thread Starter Forum Replies Last Post
91 Pace Arrow 454 TBI Flooding dgcantrellsr Engine 5 12-14-2005 04:23 PM
350 TBI to 454 TBI Swap NAIRB Engine 1 10-16-2004 03:51 PM
454 TBI Swap Junorr Engine 0 09-06-2004 03:58 PM
454 tbi on a 350 intake??? dunegoon Engine 5 06-28-2004 06:26 AM
91 rs tbi 305 to 350 carbed tat2 Engine 2 05-15-2004 06:46 PM

All times are GMT -6. The time now is 06:37 PM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999 - 2012. All Rights Reserved.