Are there any reasons not to connect a digital meter to the coolant temp sensor and read it during these "sudden normal to high temp" spike conditions?
It is quite possible to have a temp sensor reading air in an air pocket then get splashed with a different temp coolant changing the output signal within the above mentioned 3 second time frame.
Makes me wonder how hot that air pocket is above coolant temp as well the surrounding engine metal around the sensor before the big bang, boom ouch happen$.
95 D1, 4.6 w/chip, Bosch 4 hole injectors, port work 96 heads, intake and exhaust manifolds, one off 1 1/2" ram tube base extension, 5-spd, Borla exhaust, 255/65/16. Tached out at 4,400 rpm's in 5th (three tach verification) on the flat. Stock height HD springs, 190% front / 230% rear stiffer anti-roll bars, full urethane suspension.
Going fast on the straights and around corners with confidence.
Carl.....~~=o&o>.....