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How can you reset the computer on a 2003 Chevy Trailblazer when you have replaced the thermostat and now it is idling low when AC is on and you have been told that computer needs to be reset?
Wiki User
∙ 9y ago
Whenever you disconnect the battery for several minutes then you will reset the PCM (computer).
It sounds more like you have a dirty throttle body based on your description of the problem. If you disconnected the battery when you changed the thermostat housing (most times it is impossible to change it without removing the alternator.....that bottom bolt!!!!! dang!!!) the PCM resets.
The difference is it had learned to run with a dirty throttle body. Now, after the reset, it provides running parameters for a new or clean throttle body. Problem is that the throttle body is probably dirty after several years running. The changes are slow and the computer modifies it's running parameters to maintain the trucks performance through a learning process.
Long story short: disconnect battery, remove throttle body, clean the backside of it and be careful of the sharp edge on the body where the butterfly seals - razor sharp!
Wiki User
∙ 9y ago
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