'84 Stat replacement question
03-14-2012, 02:50 PM
#1
Instructor
Thread Starter
'84 Stat replacement question
Can someone tell me if I have to drain the coolant to replace the Thermostat, it looks like the rad is low enough but wanted to ask the experts...thanks in advance.
G
G
Last edited by GMAN1953; 03-14-2012 at 02:51 PM. Reason: wrong folder..sorry
03-14-2012, 03:02 PM
#2
Even if your coolant system was completely full.. you would loose about 2 - 3 pints
Squeeze the upper hose.. if there is nomore coolant in the upper hose.. that would be the perfect level to work with
Squeeze the upper hose.. if there is nomore coolant in the upper hose.. that would be the perfect level to work with
03-14-2012, 03:05 PM
#3
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G
Ps...will I need to do anything else after installing the 160 stat, reprogram or just fill and run?...Thanks!
Last edited by GMAN1953; 03-14-2012 at 03:23 PM.
03-15-2012, 02:30 AM
#5
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I ran a 160deg T-stat for 12yrs with mileage from 98K to >200k with no problems, i.e. valve train looked nice and shiney.
Lower coolant temp gave me two benefits:
-more HP
-the ECM does not call for EGR until colant temp is >175 deg F.
Lower coolant temp gave me two benefits:
-more HP
-the ECM does not call for EGR until colant temp is >175 deg F.
03-15-2012, 04:16 AM
#6
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Thanks! G
03-15-2012, 04:18 AM
#7
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Thanks! G
03-15-2012, 07:10 PM
#10
Your car's computer uses the coolant temp sensor (among other sensors) to fuel the engine, a cooler engine needs more fuel to run properly. Remember efi engines dont have chokes which restrict air (or richen up the mixture), so the ecm uses the cts to richen the mixture. Thats why efi engines run better cold then carbed egines, they get a much more accurate mixture.
So running an efi engine at a cooler temp is like having the choke closed alittle. You might not notice the mpg drop in warm weather because your engine temp will excede 160* while going down the road. But if its cool, like 50s or lower, your coolant temp might be close to 160* while going down the road.
I used to live in sw michigan, ran a 180 stat for a year, I noticed a 3-4 mpg drop during the early spring & late fall.
So running an efi engine at a cooler temp is like having the choke closed alittle. You might not notice the mpg drop in warm weather because your engine temp will excede 160* while going down the road. But if its cool, like 50s or lower, your coolant temp might be close to 160* while going down the road.
I used to live in sw michigan, ran a 180 stat for a year, I noticed a 3-4 mpg drop during the early spring & late fall.
03-15-2012, 07:32 PM
#11
Instructor
Thread Starter
Your car's computer uses the coolant temp sensor (among other sensors) to fuel the engine, a cooler engine needs more fuel to run properly. Remember efi engines dont have chokes which restrict air (or richen up the mixture), so the ecm uses the cts to richen the mixture. Thats why efi engines run better cold then carbed egines, they get a much more accurate mixture.
So running an efi engine at a cooler temp is like having the choke closed alittle. You might not notice the mpg drop in warm weather because your engine temp will excede 160* while going down the road. But if its cool, like 50s or lower, your coolant temp might be close to 160* while going down the road.
I used to live in sw michigan, ran a 180 stat for a year, I noticed a 3-4 mpg drop during the early spring & late fall.
So running an efi engine at a cooler temp is like having the choke closed alittle. You might not notice the mpg drop in warm weather because your engine temp will excede 160* while going down the road. But if its cool, like 50s or lower, your coolant temp might be close to 160* while going down the road.
I used to live in sw michigan, ran a 180 stat for a year, I noticed a 3-4 mpg drop during the early spring & late fall.
Regards; G
this winter.
03-15-2012, 07:42 PM
#13
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03-16-2012, 04:16 AM
#15
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