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The Terminator
Engine/Tuning
160 Thermostat?
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<blockquote data-quote="05 Roush" data-source="post: 1930114" data-attributes="member: 10919"><p>No, those are incorrect statements. THW readings affect just about everything the ECU does. If N.O.T. is never reached, it will affect timing, idle speed, fuel A/F (Warm-Up Enrichment), and hot startup.</p><p></p><p>Startup enrichment is triggered by a timer immediately after startup. After that, the THW signal is used. Now, it might be safe to say that Ford is using 158° for basic calculations to turn off the cold start cycle, but as you can imagine reasonable error in the mechanical thermostat (meaning it runs open loop at 157°F can cause problems with this circuit.</p><p></p><p>Secondly, if the car never reaches normal operating temperatures, the 02 sensors continue to operate in an open loop, and therefore are never used to adjust A/F mixture.</p><p></p><p>Thirdly, if the coolant doesn't reach a certain temperature, it does three things. 1) The oil temperature may or may not reach the ever critical 190°F mark, and can cause premature engine wear , 2) The length of time the coolant is in the radiator is diminished (since the thermostat is open longer), and 3) For every pound of pressure exerted on the coolant in the system, the static boiling point of the coolant is raised by approximately 3°F; this of course is assuming the system is pressurized to the correct level after reaching normal operating temperatures, which may not happen if the majority of coolant is below 180°.</p><p></p><p>For everyone's reading enjoyment:</p><p></p><p><a href="http://www.autoshop101.com/forms/h24.pdf" target="_blank">http://www.autoshop101.com/forms/h24.pdf</a> </p><p><a href="http://www.centuryperformance.com/coolingsys.asp" target="_blank">http://www.centuryperformance.com/coolingsys.asp</a></p></blockquote><p></p>
[QUOTE="05 Roush, post: 1930114, member: 10919"] No, those are incorrect statements. THW readings affect just about everything the ECU does. If N.O.T. is never reached, it will affect timing, idle speed, fuel A/F (Warm-Up Enrichment), and hot startup. Startup enrichment is triggered by a timer immediately after startup. After that, the THW signal is used. Now, it might be safe to say that Ford is using 158° for basic calculations to turn off the cold start cycle, but as you can imagine reasonable error in the mechanical thermostat (meaning it runs open loop at 157°F can cause problems with this circuit. Secondly, if the car never reaches normal operating temperatures, the 02 sensors continue to operate in an open loop, and therefore are never used to adjust A/F mixture. Thirdly, if the coolant doesn't reach a certain temperature, it does three things. 1) The oil temperature may or may not reach the ever critical 190°F mark, and can cause premature engine wear , 2) The length of time the coolant is in the radiator is diminished (since the thermostat is open longer), and 3) For every pound of pressure exerted on the coolant in the system, the static boiling point of the coolant is raised by approximately 3°F; this of course is assuming the system is pressurized to the correct level after reaching normal operating temperatures, which may not happen if the majority of coolant is below 180°. For everyone's reading enjoyment: [url]http://www.autoshop101.com/forms/h24.pdf[/url] [url]http://www.centuryperformance.com/coolingsys.asp[/url] [/QUOTE]
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