IAC
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Most likely because the iac screw is turned too far cw-assuming that everything is working okay. Means your idle is being controlled by the throttle blade rather than the ecm. Most likely someone thought it was an idle adjustment screw.
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Follow these instructions to reset: http://www.gnttype.org/techarea/faq/IACreset.html
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No, don't do that..use your scanmaster..it works much better. Just unscrew the iac adjustment screw about a 1/2 turn at a time and stop/restart the engine to reset the iac...after each restart, check the iacs and continue until they are 15-25.
Be sure the engine is fully warmed up, in park, and the ac is off.
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Be sure the engine is fully warmed up, in park, and the ac is off.
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Buick service manual was written a long time ago and did not anticipate you would have a scan tool there to read. Also, Buick gives a pretty broad range and most of us have found that the lower end of the range works better-scantool makes it a lot easier...just important to keep restarting the engine after each adjustment so the ecm will reset everything.
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Guess that would explain why I could never get mine to drop. Shutdown/restart engine. Hmmmm.
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