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Tech & Fab
LS thermostat talk
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<blockquote data-quote="altfuel1991" data-source="post: 538084" data-attributes="member: 1211"><p>On a stock LS truck engine the thermostat is designed to keep the engine above 195 degrees. When the engine is cold the ecm adds extra fuel to keep it running and heat it up quicker, basically you have an electronic choke. The ecm has to see at least 187 degrees in the engine before it will go into hot-run mode and lean the mixture out. That function needs to be programmed out if running a colder thermostat. On trucks we see at the shop if the thermostat is stuck open the engine will not get above the 187 degree level.</p></blockquote><p></p>
[QUOTE="altfuel1991, post: 538084, member: 1211"] On a stock LS truck engine the thermostat is designed to keep the engine above 195 degrees. When the engine is cold the ecm adds extra fuel to keep it running and heat it up quicker, basically you have an electronic choke. The ecm has to see at least 187 degrees in the engine before it will go into hot-run mode and lean the mixture out. That function needs to be programmed out if running a colder thermostat. On trucks we see at the shop if the thermostat is stuck open the engine will not get above the 187 degree level. [/QUOTE]
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