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Idle problem CURE!!!!!!!! Finally!!

2.0L LSJ Performance Tech 205hp Supercharged SS tuner version. 200 lb-ft of torque.

Idle problem CURE!!!!!!!! Finally!!

Old 05-16-2015, 11:12 AM
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Old 05-16-2015, 11:14 AM
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Originally Posted by chris88z24 View Post
no
Was that in response to my question or....?
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Old 05-16-2015, 11:25 AM
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Old 05-16-2015, 11:27 AM
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Originally Posted by chris88z24 View Post
yes
ANy ideas why I'm running rich? Everything in motor is stock, I have a cat back and a cold air intake. Nobody seems to know why I'm running rich.
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Old 05-16-2015, 11:29 AM
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Faulty MAF sensor from CAI would be my guess. It doesn't take much moisture to ruin them.
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Old 05-17-2015, 07:04 PM
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inside the supercharger is gross and black too. how can i clean that? tb cleaner? plz halp
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Old 08-28-2015, 08:41 PM
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I havent really been having idle problems with my 05 until today when i put a cold air intake on and it threw a P0068 code (MAP/MAF - Throttle Position Correlation), idle drops every once in a while but when i throw the code while driving "eng pwr reduced" comes on and the car limps and hardly goes!! any idea on how to fix that??
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Old 02-17-2016, 10:43 PM
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Originally Posted by DCromer View Post
I havent really been having idle problems with my 05 until today when i put a cold air intake on and it threw a P0068 code (MAP/MAF - Throttle Position Correlation), idle drops every once in a while but when i throw the code while driving "eng pwr reduced" comes on and the car limps and hardly goes!! any idea on how to fix that??
Sorry for the late respose. Hopefully you figured it out but if your car is saying Engine PWR reduced, turn your car off right away.

I get that eery once in a while and i get a p1516 code too which is for throttle position sensor. It essentially the sensor in th gas pedal.Change that and you should be golden.
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Old 07-29-2016, 11:40 AM
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Cleaning CIA tubing

I havent tried cleaning the TB. However i just did a motor swap about 2 weeks ago on my lt. (Original motor was locked up) so when i was putting in the new 2.2 i had to switch over the TB because the one attached to the donor motor was a cabled TB (off an 06 ion) while moving over the TB i had already cleaned it and there was ALOT of residue on it, i also cleaned the filter thinking the oil was from the K&N typhoon filter, however i never cleaned out the tubing from the filter to the TB. Perhaps we should clean the piping as well as the TB and vacuum line??

Any Thoughts?

Also when i cleaned the TB while doing the swap, the car started and ran perfect w no idle issue. After 2 weeks of being a daily it started having idle issues, dad thought it was dirty injecters, didnt notice too much of a difference after a tank of 93 and a bottle of sea foam.
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Old 07-29-2016, 11:58 AM
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Did you move the butterfly valve in the tb by hand when you cleaned it? You probably damaged it if you did.
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Old 07-29-2016, 12:05 PM
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Originally Posted by double clutch View Post
Did you move the butterfly valve in the tb by hand when you cleaned it? You probably damaged it if you did.
I may have, mostly remember spraying it down, but its possible i couldve opened the valveand sprayed
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Old 07-29-2016, 01:05 PM
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Ive seen so many people say that and it is so not true. I could sit there and move the throttle blade on mine back and forth for hours and the car will run fine everytime.
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Old 07-29-2016, 01:16 PM
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No it wont happen everytime but it is a possibility and i have had to replace mine before due to that
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Old 07-29-2016, 01:37 PM
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Originally Posted by double clutch View Post
No it wont happen everytime but it is a possibility and i have had to replace mine before due to that
When i drive i have great throttle response. When i come to a stop it idles perfectly, its just when i start the car. Doesnt matter if its sat over night or i turned it off to grab a bite to eat. Once i start up itll idle fine for about 10-15secs then the rpms get lower and lower. If i hold the throttle at 1500-2000 rpms for a few seconds itll idle fine and wont have any issues till i shut it off again.
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Old 07-29-2016, 06:13 PM
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No codes? Sounds like its only doing it in closed loop. Unplug the primary o2 and see if it still does it.
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Old 07-29-2016, 06:30 PM
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Originally Posted by Slowbalt2000 View Post
No codes? Sounds like its only doing it in closed loop. Unplug the primary o2 and see if it still does it.
Next on my to do list, it does have check engine light on. I did a motor swap about 2 or 3 weeks ago, never took the car in to had the codes deleted. Gonna do that tonight.
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Old 07-30-2016, 12:25 AM
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I just cleaned mine yesterday, including push the butterfly open to get the gunk from around it. Key is being gentle.
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Old 08-06-2016, 07:23 PM
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I am going to have to try this. Goldilocks just got out of the shop for a wiring issue and now she is fluttering when I am in gear and slowing down. She would drop from 1000rpms to 500rpms and almost stall out. I was afraid it would be my fuel pump. Definitely trying this first!
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Old 08-06-2016, 08:11 PM
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It ended up being my upstream o2 sensor. Changed it and now its running fine. Also changed my MAF sensor. Cleaned the TB first but didnt help, so changed the MAF then nothing changed. O2 sensor helped alot. Still have check engine light after disconnecting battery so still need to find where else im having issues. Probably downstream o2.
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Old 08-06-2016, 08:44 PM
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Originally Posted by Baltictech View Post
It ended up being my upstream o2 sensor. Changed it and now its running fine. Also changed my MAF sensor. Cleaned the TB first but didnt help, so changed the MAF then nothing changed. O2 sensor helped alot. Still have check engine light after disconnecting battery so still need to find where else im having issues. Probably downstream o2.
What codes ?
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Old 08-20-2016, 04:07 PM
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Hi everyone I'm new to this thing and I just got an cobalt SS 2005 SC and I have some problems that even mechanics don't know about it I don't know what's going on with it the rpm is going up and down with check engine on and there is a map sensor and barometric sensor codes reading that what my mechanic said I bought new ones put them on same thing with check engine and now the car is kind of stalling and when I put first gear or second without pushing gas the car goes by it self once I take off my foot from the clutch it's really annoying and I don't know what's going on with it I cleaned my throttle body and everything but same thing nothing is working and when I bought the car I saw the supercharger is different pulley is different and the barometric sensor was disconnect the supercharger is Harrop TVS 1320 I don't know what's going on here if you guys can help me with it thanks I even have videos and pic of the car running and what's disconnected in it
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Old 09-28-2016, 05:54 PM
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Oil in air filter

How can I fix this problem it's in my throttle body and air filter
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Old 08-20-2017, 03:12 PM
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Thank you so much, I just bought an 05 Cobalt that had an idling issue, just tried this and it's running awesomely!
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Old 05-18-2018, 02:37 PM
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Exhaust manifold

Mine was a crack down the exhaust manifold! Coming to a stop slows the motor allowing fresh air in straight to the O2 sensor resulting in the computer dumping fuel in the other side. I bought JB weld extreme heat for $9 seems to be running good for now.
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Old 09-24-2018, 10:49 AM
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if you haven't done this yet you should. I did not have my engine ever stall, but did I notice in stop and go traffic once in a while the rpm's would dip when coming down, then once in a while shutter very slightly when sitting at a stop for a while, it was never consistence or concern of some major issue. during summer heat with a/c on in stop and go traffic did noticed the dipping more then ever and on two different days it dipped the rpms down to 450 or so. I got the car with 100K miles on it, and I am fairly certain it had never been cleaned. as when I took it apart the build up was thick, very thick...I removed the throttle body and resorted to using a old credit card to scrap the carbon build up off, then two tooth brushes and 4 cans of throttle body cleaner. after about 2 hours, it was spotless, I then cleaned the intake portion of the supercharger. never thought it ran poorly but when it put it back together it runs like I never heard, silky smooth, and idle increased about 150 rpm's. now no matter the load, it has yet to shutter, or have the rpm's dip. easy and a huge difference.

Last edited by 71jcguy; 09-25-2018 at 04:21 PM.
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