305 surging after warm at idle - Third Generation F-Body Message Boards


TBI Throttle Body Injection discussion and questions. L03/CFI tech and other performance enhancements.

305 surging after warm at idle

Reply
 
Thread Tools Search this Thread
Old 09-03-2012, 08:01 PM   #1  
Member
Thread Starter
iTrader: (1)
 
Join Date: Sep 2012
Location: Minnesota
Posts: 129
Car: 91' Camaro RS
Engine: 305 TBI V8
Transmission: 700/R4
Axle/Gears: Stock

305 surging after warm at idle

Hi guys,
Im new to the forum. I have a 91' camaro RS with the 305 TBI. It starts and runs good but after the car gets warmed up somtimes at a red light when my foot is off the gas the engine will surge. Its like it want to die then the computer recovers and the process repeats. It doesnt happen often and at one idle it will and one it wont on the same drive.
Ive noticed if at a red light I roll up very slowly before stopping it wont surge but if I do a harder stop it will. Like if im giving it time to adjust to the idle it will be fine but if I dont it will surge.
Ive also noticed poor fuel economy and a semi high idle.
Any Ideas? Its my first car so I dont want to throw too much into it. I just want it to run nice. Im going to pop the EGR valve off tommarow to see if it is shot and mabey replace the o2 sensor just incase.
Thanks
Nighthawkf-117 is offline   Reply With Quote
Old 05-01-2017, 07:42 PM   #2  
Junior Member
 
Join Date: Apr 2014
Posts: 40

Re: 305 surging after warm at idle

Did you ever find the problem , my car is doing the same thing.
wisemanz28 is offline   Reply With Quote
Old 05-01-2017, 08:05 PM   #3  
Senior Member
 
Join Date: Feb 2011
Posts: 942

Re: 305 surging after warm at idle

Wild Guess: Dirty IAC passages, dirty throttle body. Perhaps the IAC motor is getting weak?

Connect a scan tool, look at the commanded idle speed vs. the actual idle speed. For that matter, look at all the rest of the data stream.
Schurkey is offline   Reply With Quote
Old 05-03-2017, 07:25 AM   #4  
Supreme Member
iTrader: (2)
 
KITT1983's Avatar
 
Join Date: Mar 2008
Location: Boston, MA
Posts: 2,790
Car: 1983 Pontiac Trans Am Daytona 500
Engine: Crossfire 305ci V8
Transmission: Jasper 700R4 4 speed Automatic
Axle/Gears: 3.23 limited slip/posi


Re: 305 surging after warm at idle

any vacuum leaks ?
KITT1983 is offline   Reply With Quote
Old 05-03-2017, 08:13 PM   #5  
Junior Member
 
Join Date: Apr 2014
Posts: 40

Re: 305 surging after warm at idle

no vacuum leaks, going to look at the iac this weekend
wisemanz28 is offline   Reply With Quote
Old 05-14-2017, 05:09 AM   #6  
Supreme Member
 
thomas1976's Avatar
 
Join Date: Jun 2006
Location: West-Central
Posts: 2,198
Car: 91 Trans am
Engine: built 360 TBI
Transmission: built 700r4
Axle/Gears: 10bolt/3.23


Re: 305 surging after warm at idle

Tired fuel pump (check fuel pressure).
Failing alternator voltage regulator (check if voltage drops at lower rpm).
thomas1976 is offline   Reply With Quote
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
1992 camaro 305 v8 TBI idles very high and shifts at high idles db057 TBI 12 03-16-2017 08:20 AM
Surging/hunting idle bamaboy0323 Tech / General Engine 25 09-03-2015 06:07 AM
305 TPI Surges at Highway Speeds jbd1969 Tech / General Engine 1 08-17-2015 07:06 PM
Some questions on narrowband vs wideband. IROCThe5.7L DIY PROM 1 08-10-2015 11:24 AM


Go Back   Third Generation F-Body Message Boards >

Tags
305, 350, ajustment, body, camaro, gen, idle, sbc, surges, surging, tbi, throttle, warm, warmed, warming

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 Off
Pingbacks are Off
Refbacks are Off


Advertising
Featured Sponsors
Vendor Directory

1982 Camaro '82 || 1983 Camaro '83 || 1984 Camaro '84 || 1985 Camaro '85 || 1986 Camaro '86 || 1987 Camaro '87 || 1988 Camaro '88 || 1989 Camaro '89 || 1990 Camaro '90 || 1991 Camaro '91 || 1992 Camaro '92


All times are GMT -5. The time now is 03:48 PM.


© 2018 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 Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: