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Intake manifold temperature creeping higher?

Yahoo Message Number: 101463
Hello Country Coachers: I have been noticing that my manifold temperature has been creeping higher.  It used to be 10-14 degrees F higher than ambient temperature. But now I'm seeing (via Silverleaf) 18-20 degrees higher than ambient temp.  Fuel milage is decreasing too.  Ambient temp today was from 88-92F. Anyone have any insight of possible causes?  TIA

Larry 03 Allure 30856 ISL 370 80K miles

Re: Intake manifold temperature creeping higher?

Reply #1 –
Yahoo Message Number: 101464
Failed to mention engine Temps are normal 180-195
 

Re: Intake manifold temperature creeping higher?

Reply #3 –
Yahoo Message Number: 101473
Mikee: It Has been a while. Indicator looks good, but I'm told,  unreliable.  Will take a look at it.  Thanks.  Larry