Engine Management eCtune , Crome , AFC , FMU , Zdyne , Hondata , EMS , TE , Uberdata Anything to control your fuel, spark needs!

Erratic cold idle

Old 05-31-2004, 07:31 PM
  #1  
1.5 BAR
Thread Starter
 
Join Date: Mar 2003
Posts: 1,190
Default Erratic cold idle

When I turn on my car and it's not warmed up, my idle #1. is really high and #2. becomes erratic going between 1000 and 1500 rpm. After it's warmed up, it idles at 750 rpm like a champ, solid. I am using Uberdata, with cold idle set at 1000 rpm, running idle at 900 rpm, and standard idle at 750 rpm. Engine speed is now going as high as 2000 rpm when I first start the car. My ecu has closed loop mode disabled. I suspect my problem might be a vacuum leak. Any other ideas?
willahlborn is offline  
Old 06-01-2004, 09:31 AM
  #2  
1.5 BAR
 
Join Date: Dec 2002
Posts: 1,008
Default Re:Erratic cold idle

mine does the same thing cold...if it was a vac leak it would do it cold or warm.
scttydb411 is offline  
Old 06-01-2004, 12:05 PM
  #3  
3.0 BAR
 
Join Date: Feb 2003
Posts: 9,089
Default Re:Erratic cold idle

thats because your FITV is letting air in when the engine is cold. set your cold idle to 2k and I bet it'll be smooth as silk.
88crxSi is offline  
Old 06-01-2004, 05:07 PM
  #4  
3.0 BAR
 
Join Date: Mar 2003
Posts: 5,285
Default Re:Erratic cold idle

It's possible and worth a shot, but from what I've learned the ecu really has minimal control over how the engine is going to idle.
tranceminister is offline  
Old 06-02-2004, 08:41 AM
  #5  
3.0 BAR
 
Join Date: Feb 2003
Posts: 9,089
Default Re:Erratic cold idle

the FITV is designed to let enough air in for the engine to idle at 2k for cold start. If your ecu at the same time is targetting 1k it'll will fall down and then jump back up. thats my view of the hole problem. hell It can't hurt to burn a chip and plug it in and try, right?
88crxSi is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
StreetTuner
Hybrid/Tech
3
04-15-2011 02:47 AM
quicksilvia
General Discussion
33
02-26-2006 06:04 PM
shmaptoe
Engine Management
13
08-15-2005 11:04 PM
SpankedYA!
Engine Management
2
09-06-2004 11:36 AM
OnYx
Forced Induction
3
01-31-2003 04:29 AM


Thread Tools
Search this Thread
Quick Reply: Erratic cold idle


Contact Us - Sitemap - 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 Amazon.com and affiliated sites.