High Idle After Cleaning Throttle Body / A Fix - Chevy Cobalt Forum / Cobalt Reviews / Cobalt SS / Cobalt Parts
Chevy Cobalt Owners Lounge General Chevy Cobalt discussion

 
LinkBack Thread Tools Display Modes
post #1 of 7 (permalink) Old 09-28-2010, 06:52 AM Thread Starter
Newcomer
 
Join Date: Mar 2010
Posts: 4
High Idle After Cleaning Throttle Body / A Fix

My idle on my 2.2 engine was not constant and low at times. I cleaned the throttle body and like other people, it had a high rpm's of 1500 - 2200 afterwards. After looking on the net and only found fixes from new throttle body to taking it to dealer to get the comp. flashed. I disconnected the battery for two hours and still had same high idle problem. I then noticed when I was driving I could let off the clutch at a red light while in first gear to where the RPM's where at normal range (7-800) and after about 30 sec's it would stay there when I pushed the clutch in. But once I started hitting the gas to go it would go back to high RPM's. So when I got home I started it again used the clutch while in gear to put it at the normal RPM's and after a minute or so pushed the clutch all the way it stayed at normal range and then put it in neutral and then I let it idle for about two hours at the normal RPM's without touching the gas pedal at all. Now its running like brand new no more high idle at ALL!! I have a standard so dont think it will help anyone with an automatic? I guess the comp. finally learned itself the right idle again or I just got lucky! Anyway I hope this helps someone, just to cheap here to spend a hundred dollars for the dealer to flash my comp. on car.
svetter84 is offline  
Sponsored Links
Advertisement
 
post #2 of 7 (permalink) Old 09-28-2010, 08:52 AM
Forum Regular
 
Storino2.2's Avatar
 
Join Date: Jul 2010
Location: Pittsburgh
Posts: 125
Garage
ya what happens is when u open and close the throttle while cleaning it, the TPS (Throttle Postion Sensor) reads that and rests what it sees as Zero, that being said when u touch the gas and ur throttle starts to open, the TPS doesnt see it as a small increase it may see it as a big increase because the Zero point has been changed slighty during cleaning.. if u ever clean out ur throttle body, try not to open the throttle at all otherwise it will idle very high, i used to work a Rohrich Caddy and a one of the techs told me this while i was servicing a DTS for a tune up


^^showoff thread^^
Storino2.2 is offline  
post #3 of 7 (permalink) Old 09-28-2010, 08:54 AM
Veteran
 
G5Steven's Avatar
 
Join Date: Oct 2009
Location: Lake Co. Florida
Posts: 674
Garage
Send a message via AIM to G5Steven
What you have is a relearning computer, don't worry bout it, I cleaned mine a few months back (had 80,000miles on it at the time) and there was so much carbon build up I could see a lip in the carbon where the throttle blade sat. Once that carbon is gone, it is essentially an adjusted throttle position. It will take about a week for it to go back to normal.

You just cleaned all the carbon out, and it gave it a "bigger throttle opening"... if it doesn't fix itself after a few times of driving, then take it to the dealer next week.
G5Steven is offline  
post #4 of 7 (permalink) Old 09-28-2010, 11:31 AM
Veteran


 
dkscbalt's Avatar
 
Join Date: Jun 2009
Location: Wisconsin
Posts: 527
Send a message via Yahoo to dkscbalt
Yea I swap out my 2.2 and 2.4 throttle bodies every once and a while and evey time I do it my idle gets a lil weird for a bit


Built not bought fully bolted 2.2 and Trifecta Tuned

Authorized Trifecta Reseller In Central Wisconsin

Check out my new showoff thread!!!
https://www.yourcobalt.com/forums/veh...entral-wi.html
dkscbalt is offline  
post #5 of 7 (permalink) Old 09-28-2010, 11:49 AM
YourCobalt of the Month Winner
YourCobalt.com Premium Member


 
LSlowBalt's Avatar
 
Join Date: Aug 2009
Location: Roaring Springs, PA
Posts: 1,429
Garage
Send a message via Yahoo to LSlowBalt
Have to get the comp flashed it only cost me like $45
LSlowBalt is offline  
post #6 of 7 (permalink) Old 09-28-2010, 12:32 PM Thread Starter
Newcomer
 
Join Date: Mar 2010
Posts: 4
I like your idea about cleaning the throttle body better Storino2.2. Mine was full of carbon also I might not wait til my next 100,000 miles to clean it! This time when I take it off Ill try it your way about not opening the flapper at all on the throttle body and just clean what I can reach and see if it works! Thanks for everyones input, just trying to be helpful!
svetter84 is offline  
post #7 of 7 (permalink) Old 09-28-2010, 12:50 PM
Veteran
 
GpB311's Avatar
 
Join Date: Jun 2010
Location: Los Angeles, CA
Posts: 713
Garage
I guess I got lucky since when I cleaned my TB I totally pushed the blade up n down to get more access at all the carbon build up and my idle remained the same to this day

GpB311 Showoff Profile https://www.yourcobalt.com/forums/veh...ngeles-ca.html


You might also know me as Dick Thrusthumper...
GpB311 is offline  
Sponsored Links
Advertisement
 
Closed Thread

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



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

 
For the best viewing experience please update your browser to Google Chrome