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Finally caught one today.
It started as I was driving at slow speed through the city. When I parked the car the coolant fan turned on at only 63F temp outside. Got home quickly for my tablet and started driving again. The car wanted so badly to go up in EGT but driving on the streets did not help matters at all.
I got on the freeway and the EGT went up to 1150-1170, EGR 0%, Coolant 205F, Load 60-64% for 10 minutes. Then temps cooled down a bit, EGT 500F, coolant 188F, EGR 94% and load less than 50%.
This happened to me last week too, but I couldn't get to the freeway. It tried to go up in EGT but did not happen, so it quit by itself.
Torque is an indispensable tool.
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