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Question - when using the Corral's tech article for setting the idle on a EFI 5.0L Mustang, do you do this with the engine cold or already warmed up?

Thanks!
 

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get it up to normal running temperature first..
 

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Warm. When the engine is cold it's not reading the O2 sensors and it's running off the fuel and timing tables that are stored for cold idle. Adjust it when it's warm and the EEC will transpose the new correction factors into the cold idle tables to update the tables. Good luck.

Carson
 
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