Idle Surges! - LS1LT1 Forum : LT1, LS1, Camaro, Firebird, Trans Am, Engine Tech Forums

Welcome to LS1LT1.com/LS3forums.com - please click here to register...

LS1LT1 Forum : LT1, LS1, Camaro, Firebird, Trans Am, Engine Tech Forums
Presented by:

New User? Register
LS1 Forums Register Photo Gallery Tech/FAQ Members List Calendar Auto Loans Search Today's Posts Mark Forums Read Auto EscrowInsurance
Premium Membership Videos Perf Tools Mobile/iPhone Link to Us! Social Groups Follow LS1LT1 on Twitter


Go Back   LS1LT1 Forum : LT1, LS1, Camaro, Firebird, Trans Am, Engine Tech Forums > Engine Tech > LT1 | LT4 | L99 Engine Tech

LS1LT1.com is the premier Pontiac Forum on the internet. Registered Users do not see the above ads.
Reply
 
Share LinkBack Thread Tools
Old 05-10-2012, 10:32 PM   #1
Regular Member
 
algermilitia's Avatar
 
Join Date: Jan 2010
Location: Great Northwest Washington
Posts: 401
algermilitia user's tech expertise is unknown at this point
Default Idle Surges!

Ok guys, after a few months I got my engine back in my car. It's an LT1 in a 1995 Formula. Stock tuning. However, it's got completely rebuilt internals and a new cc305 cam and springs. The problem I'm having is the same as before. The engine surges, feels quite rough at idle, and occassionally there is a noise that sounds like either something is seizing up or the starter is trying to engage. I'm starting to believe my starter is not fully disegaging or perhaps an arc is occurring between the power and silinoid wire. Anyway, I took a log while the car was running. The IAC is very high, compared to an old log when the car was running a couple years ago. And the IAC fluctuates up and down. The MAP seems high as well, but after reading the log, it is near identical numbers to the original engine configuration log, except when the IAC fluctuates, the MAP fluctuates as well. Sometimes above .5, when it should be around .3 to .34. I need to figure out why the idle is fluctuating so much. It may just have something to do with the new cam, but I've looked at files from tuners using the cc305 cam, and their timing charts are identical to stock. Give me some ideas what to look for, please!

Thanks
algermilitia is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Sponsored Links
Advertisement
 
Old 05-11-2012, 06:28 AM   #2
Global Moderator
 
cocobolo95's Avatar
 
Join Date: Sep 2008
Location: Fruitland Park,Florida
Posts: 9,720
cocobolo95 Tradesman Level Tech II
Default

If you look in the sticky threads of this section there is a cam selection guide which states your cc305 has idle surge as standard equipment with it. You do need to retune your pcm for the cam your using now. Have pcm retuned then see how she runs and compare to stock data logs.
cocobolo95 is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Old 05-11-2012, 06:55 PM   #3
Regular Member
 
algermilitia's Avatar
 
Join Date: Jan 2010
Location: Great Northwest Washington
Posts: 401
algermilitia user's tech expertise is unknown at this point
Default

I don't know why, but everything started up and ran fine today. Haven't touched anything.
algermilitia is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Sponsored Links
Advertisement
 
Reply

Bookmarks

Thread Tools

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


» Recommended
Find technical articles on a Chevy Corvette, including tips and tricks on a Chevy Camaro and expert advice for Pontiac Firebird, along with reviews on the Cadillac CTS.
» Auto Insurance
» Sponsors
Powered by vBadvanced CMPS v3.2.2

All times are GMT -5. The time now is 03:05 AM.



Powered by vBulletin® Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.5.2
Copyright © 2005 - 2011 by LS1LT1.com

Our Friends:


Illegal Street Racing | Super Cars | LT1 Tech Articles