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Old 07-26-2013 | 06:57 PM
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The 6.2 MPI s in my 29' Fountain Fever came with 160 degree thermostats. Will switching to 140 degree thermostats
cause the computer to think the engines are not at operating temperature and give an improper air/fuel ratio or
would the switch be ok?
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Old 07-26-2013 | 11:17 PM
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They are made for 160*'s. If it ain't broke, don't try and fix it.
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Old 07-27-2013 | 05:04 PM
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Your ECM 555 is mapped accordingly to the original 160 degree t-stat. Your motor has the possibility of running rich with a lower T-stat temp. Coolant temp sensor and map sensor are main sensors that report back to the ECM for proper fuel deliveries.

Last edited by BUP; 07-27-2013 at 05:06 PM.
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Old 07-27-2013 | 10:07 PM
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Originally Posted by BUP
Your ECM 555 is mapped accordingly to the original 160 degree t-stat. Your motor has the possibility of running rich with a lower T-stat temp. Coolant temp sensor and map sensor are main sensors that report back to the ECM for proper fuel deliveries.
+1
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Old 07-28-2013 | 01:24 AM
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Originally Posted by Wes Burmark
The 6.2 MPI's in my 29' Fountain Fever came with 160 degree thermostats.

Will switching to 140 degree thermostats cause the computer to think the engines are not at operating temperature?
...give an improper air/fuel ratio?
...would the switch be ok?


Yes.
Yes.
No.
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Old 07-28-2013 | 11:20 AM
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I appreciate the feedback on this. Thanks for your expertise.
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