High idle after cleaning throttle body
09-05-2016, 08:38 PM
#1
High idle after cleaning throttle body
I just cleaned the throttle body on my 2.4 Ion AT, and the car now idle high 2500-3000rpms. I moved the butterfly, and now I realized that is a big no no. So what can I do to fix this. On old threads I read that the dealer needs to reflash, obviously there has got to be a cheaper and easier fix. What can I do?
09-07-2016, 11:33 AM
#3
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Have you tried to leave the key in the "on" position for a minute or two without starting the vehicle? Usually the Bosch throttle bodies need to go through a throttle body learn procedure. I am sure of this, what I am unsure of is the initiation time in the calibration for the cobalt. The reason a reflash works is because it overwrites the stored values from the learn procedure thus forcing it to "learn" on first key on. Moving the butterfly valve doesn't really screw with the throttle body. All it is is a redundant potentiometer and a motor with some gears.
I would give this a try before committing to a reflash, which will at minimum cost you $100.
Source? Was an application Engineer at Bosch working on Electronic Throttle bodies. Now I am a calibration engineer still using Bosch Electronic Throttle bodies. They are all based on the same design principles, Bosch, Pierrburg, Mikuni, Siemens, and Continental.
I would give this a try before committing to a reflash, which will at minimum cost you $100.
Source? Was an application Engineer at Bosch working on Electronic Throttle bodies. Now I am a calibration engineer still using Bosch Electronic Throttle bodies. They are all based on the same design principles, Bosch, Pierrburg, Mikuni, Siemens, and Continental.
09-07-2016, 08:40 PM
#4
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I ended up just driving the hell out of the car until it eventually
came down on it's own. Just took a week.
The GM dealership I took it to refused to flash it.
came down on it's own. Just took a week.
The GM dealership I took it to refused to flash it.
09-09-2016, 11:06 AM
#5
Have you tried to leave the key in the "on" position for a minute or two without starting the vehicle? Usually the Bosch throttle bodies need to go through a throttle body learn procedure. I am sure of this, what I am unsure of is the initiation time in the calibration for the cobalt. The reason a reflash works is because it overwrites the stored values from the learn procedure thus forcing it to "learn" on first key on. Moving the butterfly valve doesn't really screw with the throttle body. All it is is a redundant potentiometer and a motor with some gears.
I would give this a try before committing to a reflash, which will at minimum cost you $100.
Source? Was an application Engineer at Bosch working on Electronic Throttle bodies. Now I am a calibration engineer still using Bosch Electronic Throttle bodies. They are all based on the same design principles, Bosch, Pierrburg, Mikuni, Siemens, and Continental.
I would give this a try before committing to a reflash, which will at minimum cost you $100.
Source? Was an application Engineer at Bosch working on Electronic Throttle bodies. Now I am a calibration engineer still using Bosch Electronic Throttle bodies. They are all based on the same design principles, Bosch, Pierrburg, Mikuni, Siemens, and Continental.
It seems like the car finally relearned the correct idle speed after driving the hell out of the car between stop and go traffic and interstate driving.
09-13-2016, 04:56 PM
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I haven't tried that, but if I ever run into this again I will try it. I did read that there was another relearn procedure where you let the car run in park for 3 minutes, shut it off for 1 minute, and then start it again and let it run for another 3 minutes. I tried that a few times with no results.
It seems like the car finally relearned the correct idle speed after driving the hell out of the car between stop and go traffic and interstate driving.
It seems like the car finally relearned the correct idle speed after driving the hell out of the car between stop and go traffic and interstate driving.
09-23-2016, 03:01 PM
#7
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This is a known symptom after TB cleaning, came across it in solstice forums
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