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Old 08-09-2012, 12:33 AM
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Throttle Body Relearn?

Ok my girlfriends brother thought it was a good idea to put a intake from a Honda on her cobalt? Long story short he doesn't know what he's doing. She called me I came by put everything back together, started it up ran like crap, had low power warning and CEL. Make things worse he said the butterfly was stuck open so took the actuator apart to try and fix it. Pretty sure throttle body is crap, so I bought a junkyard one for her finally got it today and putting it together tomorrow. Is there a relearn process I'll have to do since he had her computers all confused with what he was trying to do? Or as long as the TB is perfect working order, should just put back together plug my scanner in and reset the CEL? I'm a Honda specialist and all this new stuff and all these computers these newer cars have are all new to me. I think with her brother around I'll be a cobalt specialist before to long lol. Thank you for your help it's appreciated
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Old 08-09-2012, 02:29 AM
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If it runs like crap and you think its the computer take it to a dealer and they can flash it for you, you'll have to pay though.

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Old 08-09-2012, 05:14 AM
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Im pretty sure it's the TB. The car ran perfect until he took the TB off and took it apart and I heard when you start pulling and prying on the actuator 9 times out of 10 it's done for. So instead of trying to replace that part and me mess it up, I just picked up a junkyard TB and hope its good. I was wondering if when replacing the TB if you have a good working one, would you have to do anything to the computer to relearn it or should it just be good after I clear the code and bolt it on and hook everything up? I'm thinking/hoping I'll just put it back together and clear the CEL and it'll be fine. It's a 09 so you would think it would be more advanced that when you replace the broke part with a good one it'll be good. But I've been through alot of stupid issues with cars and have learned to not expect anything cause that's when you get let down. You know Murphy's law, or hope for the best but expect the worst lol. I'm hoping after hooking everything up and clearing the code it'll be good but expecting annoyances so well see. Thank you
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Old 08-09-2012, 06:12 AM
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Should not need to do a throttle learn. But it might take several runs before the ECM adjust to new parameters. Here is a quote out of service manual.

Throttle Learn
Description
The engine control module (ECM) learns the idle position of the throttle plate to ensure the correct idle. The learned airflow values are stored within the ECM. These values are learned to adjust for production variation and will continuously learn during the life of the vehicle to compensate for reduced airflow due to coking. Anytime the throttle body airflow rate changes, for example due to cleaning or replacing, the values must be relearned.

A vehicle that had a heavily coked throttle body that has been cleaned or replaced may take several drive cycles to learn out the coking. To accelerate the process, the scan tool has the ability to reset all learned values back to zero. A new ECM will also have values set to zero.

The idle may be unstable or a DTC may set if the learned values do not match the actual airflow.

Conditions for Running the Throttle Learn Procedure
• DTCs P0101, P0102, P0103, P0107, P0108, P0111, P0112, P0113, P0506, and P0507 are not set.

• The engine speed is between 450-4,000 RPM.

• The manifold absolute pressure (MAP) is greater than 5 kPa.

• The mass air flow (MAF) is greater than 2 g/s.

• The ignition 1 voltage is greater than 10 volts.
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Old 08-09-2012, 06:19 AM
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Yes getting somewhere. So if all map sensors, air flow and fuel flow and everything is in correct working order, it should relearn itself so to speak? If so then all this new age computerized goodies are ok so far. But if you have to do something different and special for each new thing that breaks, then they suck lol. I will just hook everything up reset the CEL and see what happens and go from there and hope for the best lol. Thank you all I'm thinking it'll be ok and hoping but you already know
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Old 08-09-2012, 09:43 AM
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This is why I'm scared to clean the throttle body and plate good luck bro seems like u got it
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Old 08-09-2012, 09:45 AM
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Nothing to be scared of. If you dont clean the TB you loss performance. I would rather clean and have to deal with the car sputtering here and there from time to time than always be underperforming.
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Old 08-09-2012, 12:05 PM
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Quote:
Originally Posted by Bolrae View Post
This is why I'm scared to clean the throttle body and plate good luck bro seems like u got it
There is a difference in taking it off and taking it apart so taking it off should be fine.

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Old 08-09-2012, 12:56 PM
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Have you disconnected the battery for a couple minutes and hooked it back up? That might clear the issue. Yeah, cleaning your TB isn't a big deal at all... just don't manhandle it.
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Old 08-09-2012, 02:59 PM
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If you clear the "CEL" before your run you might still get an other "CEL" before everything settles down. So I would not worry, but drive it for maybe 20 minutes before clearing the next. It might be so close that the "ECM" won't even know the difference.

As far as the throttle plate there should be no problem as long as the key isn't in the ignition.
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