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Old 11-10-2011, 06:41 AM   #15
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If you use a 160* thermostat in a motor with electronic fuel injection without modifying the ECU software the ECU will always think that the engine is too cold at 160* and will enrichen the fuel mixture for a cold engine. MPG will decrease and the over rich mixture will wash down the cylinder walls and the rings will wear at a faster rate.
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Old 11-10-2011, 12:06 PM   #16
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Originally Posted by Mike Canter View Post
If you use a 160* thermostat in a motor with electronic fuel injection without modifying the ECU software the ECU will always think that the engine is too cold at 160* and will enrichen the fuel mixture for a cold engine. MPG will decrease and the over rich mixture will wash down the cylinder walls and the rings will wear at a faster rate.
Mike you may have a point. But I would imagine the engine ECU and the O2 sensors will make it go into "closed loop" operation at 160 or less, I would also think under a load it's still going to run someware around 180-185 by the time the T/stat is full open, but just a guess been a while since I worked on an FI motor that old.
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Old 11-10-2011, 01:26 PM   #17
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Mike you may have a point. But I would imagine the engine ECU and the O2 sensors will make it go into "closed loop" operation at 160 or less, I would also think under a load it's still going to run someware around 180-185 by the time the T/stat is full open, but just a guess been a while since I worked on an FI motor that old.
Ment to say carb or FI motor, I don't think they said which.
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Old 11-11-2011, 10:46 AM   #18
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It's FI, I think 160 t/statt is too low, I would be happy with 195 if it would stay at 195 regardless of conditions, A properly working cooling system should stay at set temp no matter what, right? My 10 year old Mazda tribute v6 temp guage Never budges even pulling trailer will 800lb motorcycle up hills in 100 degree. shouldnt MH do the same. If temp climbs under harsh conditions, cooling system is inadequate. Maybe new thread area, but how have other MH owners beefed up thier cooling system, I plan to add a good sized additional trans cooler. A shop near me Harbor Radiator makes custom radiators. Im going to talk to them today about possibly larger core/ coolant/trans fluid/engine oil cooling capacity
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Old 11-11-2011, 11:13 AM   #19
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Your 92 chassis has throttle body injection. I would not drain and fill cooling system as this will tend to leave more scum etc in system. Have it thoroughly flushed and refilled. Since you live in CA, you have to worry about emissions testing, under no circumstances should you replace the thermostat with a 160, I would not even try a 180, as it came with a 192or 195 thermostat simply because it needed to be that hot in order to pass emissions(unfortunately). With a good electric fan(s) and a good clutch fan you should be good to go and your temps should remain down. On my previous P chassis MH, my temps never went above 210 no matter how steep and long the grade was. If you climb higher than that consistantly then you probably should add a separate trans cooler to the unit.
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Old 11-27-2011, 12:45 PM   #20
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Could it be a head gasket? the MH only has 19,000mi but its 20 years old. I have noticed some dripping from exhaust when cold but pretty sure its condensation, engine runs fine maybe ran a little warm climbing a hill last week 210 up to about 225 but cooled back to about 200
Yes, I would think it could be a head gasket, to see if true open the radiator cold, start it op and look for air bobbles in the coolant and oil floating, oil and or coolant sud bee seen on the out site of the motor .
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