high idle after TB cleaning
#1
high idle after TB cleaning
Ive seen many post on this.I own a 2006 hhr 2.4 5 speed.I had a high idle (2500 rpm) after cleaning throttle body along with code P0507.I did manually open the throttle so i freaked out thinking i had broke it.I found out that you need to drive it between 250 to 500 miles in order for it to relearn idle.During that time rpms will rise and lower and act erratic,no worries it will sort itself out.
#3
Can't remember the exact codes but had them checked by Advance Auto before I took it to the mechanic just to keep him honest. The ignition coils were the ones replaced.....I have read even on the Chevy Cobalt forum(s) that this is a common problem with the 2.4ltr engines when you go to clean the throttle body...BTW, I never "authorized" them to clean it....I have read in some forums, many people don't clean them on such an old engine like mine for this very reason...IDK, I am planning to take it to my mechanic in NY who my father used to use his father as a mechanic...so I have a relationship with him and trust him. I am not at all handy with fixing things so I'm really at a disadvantage..
#4
Welcome to the site, yes there is the problem of high idle after cleaning the throttle body, we highly recommend not touching the butterfly valve when cleaning the TB. I personally simply remove the four bolts and lift the TB a bit and spray both sides, never had this trouble, mind you I do have a 2.2.
If the mechanic moved the throttle body butterfly plate , he could have damaged the plastic gears inside the TB motor gear housing, he owes you a new TB if that’s the case!
post #10
https://www.chevyhhr.net/forums/prob...leaning-49401/
If the mechanic moved the throttle body butterfly plate , he could have damaged the plastic gears inside the TB motor gear housing, he owes you a new TB if that’s the case!
post #10
https://www.chevyhhr.net/forums/prob...leaning-49401/
#6
I think if you just drive it, it will relearn. You need to put 45-60 minutes behind the wheel before it completely relearns. You might try turning the key in the "on" position for a couple minutes without starting the vehicle, then off for a minute, then on for a minute, then off. The throttle body needs to go through a learn procedure. Usually this solves it, worst case you reflash the pcm, but you said you already did that, so this kind of stumps me. Keep us posted. I would be interested to know what you find. Best of luck to you.
#7
If you indeed had the sensors replaced not the solenoids I suspect that a larger problem has been ignored involving the timing chain.
I suspect that the mechanics involved are cluless about the vehicle and may have broken the throttle body. You can get a new one for under $200/ used considerably less and installation involves 4 bolts and a couple of plugs. God only knows what they did with all of that ECM programming and resetting.
I suspect that the mechanics involved are cluless about the vehicle and may have broken the throttle body. You can get a new one for under $200/ used considerably less and installation involves 4 bolts and a couple of plugs. God only knows what they did with all of that ECM programming and resetting.
#10
Idle is now normal
Well folks thank you for all your replies...and your warm welcome to the forum. My 2006 HHR LT, is now after 3-4 weeks of driving it almost every day in all conditions is idling normally....any where between 800-1200rpms...I am convinced especially after reading other posts, that it takes a long long time for the computer to re-learn where the idle should be...I'm still nervous about the idle, but yesterday and again today all seemed well....So my advice is to just wait it out if you have checked every possible other reason for a high idle like vacuum leaks etc...and the computer will eventually "re-learn" where the idle should be...THanks again!!