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Discussion Starter #1
Anyone know what to do about high idle issue? After taking throttle body out and cleaning it. I did the manual relearn. It brought it down some. But still a issue. Any help would be greatly appreciated.
 

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Discussion Starter #3
How many miles did you drive after cleaning the throttle?
Atleast 1000 miles. It’s been a few months I’ve been running it. I’m guessing I’ll have to get it hooked up to a computer and see if they can do a relearn to it. I’m just afraid what that going to cost
 

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Chevy Trailblazer 2008 LTZ (4.2L)
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Do you have CEL any on the dashboard?
Throttle Learn
Without Scan Tool-Learn
1. The engine speed is between 450-4,000 RPM.
2. The manifold absolute pressure (MAP) is greater than 5 kPa.
3. The mass air flow (MAF) is greater than 2 g/s.
4. The ignition 1 voltage is greater than 10 volts.
5. Start and idle the engine in Park for 3 minutes.
6. With a scan tool, monitor desired and actual RPM.
7. The ECM will start to learn the new idle cells and Desired RPM should start to decrease.
8. Ignition OFF for 60 seconds.
9. Start and idle the engine in Park for 3 minutes.
10. After the 3 minute run time the engine should be idling normal.
If the engine idle speed has not been learned the vehicle will need to be driven at speeds above 70 km/h (44 mph) with several decelerations and extended idles.
11.After the drive cycle, the engine should be idling normally.
If the engine idle speed has not been learned, turn OFF the ignition for 60 seconds and repeat step 6.
12.Once the engine speed has returned to normal, clear DTCs.
 

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Discussion Starter #5
Do you have CEL any on the dashboard?
Throttle Learn
Without Scan Tool-Learn
1. The engine speed is between 450-4,000 RPM.
2. The manifold absolute pressure (MAP) is greater than 5 kPa.
3. The mass air flow (MAF) is greater than 2 g/s.
4. The ignition 1 voltage is greater than 10 volts.
5. Start and idle the engine in Park for 3 minutes.
6. With a scan tool, monitor desired and actual RPM.
7. The ECM will start to learn the new idle cells and Desired RPM should start to decrease.
8. Ignition OFF for 60 seconds.
9. Start and idle the engine in Park for 3 minutes.
10. After the 3 minute run time the engine should be idling normal.
If the engine idle speed has not been learned the vehicle will need to be driven at speeds above 70 km/h (44 mph) with several decelerations and extended idles.
11.After the drive cycle, the engine should be idling normally.
If the engine idle speed has not been learned, turn OFF the ignition for 60 seconds and repeat step 6.
12.Once the engine speed has returned to normal, clear DTCs.
This is what i basically did. Was hoping it would relearn all you he way after diving. Would it be possible that a air leak would cause it. I had exhaust manifold done a while ago. So kind of wondering if a bolt is loose or broke. This is driving me crazy. Lol
 
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