yep thats what i thought. and you wouldnt be able to tell unless you could view the real engine temps the ecu sees.
I explained on another thread a while back.
basically if the thermotat opens fully (sat in traffic for example) when you speed back up it fails to close enough causing a massive undercooling (warmup enrichments restart)
I did loads of tests even bought a new genuine fiat thermostat. 2 new ford stats (incase i had a faulty one when i first did it) and a halfords (not sure on the make) fiat stat.
tried all combos of springs and thermostat and non worked as it should.
I think its something to do with how far the fiat stat is designed to open and the spring pretension.
i bet if you put your low temp stat in a pan with a normal one then heated till they where both fully open then let it cool you will see what i mean. the low temp one will stay open a LOT longer then the normal one. (iirc when the normal one was fully shut the low temp was still about half open)
I explained on another thread a while back.
basically if the thermotat opens fully (sat in traffic for example) when you speed back up it fails to close enough causing a massive undercooling (warmup enrichments restart)
I did loads of tests even bought a new genuine fiat thermostat. 2 new ford stats (incase i had a faulty one when i first did it) and a halfords (not sure on the make) fiat stat.
tried all combos of springs and thermostat and non worked as it should.
I think its something to do with how far the fiat stat is designed to open and the spring pretension.
i bet if you put your low temp stat in a pan with a normal one then heated till they where both fully open then let it cool you will see what i mean. the low temp one will stay open a LOT longer then the normal one. (iirc when the normal one was fully shut the low temp was still about half open)