| I obtained this info through painstaking reverse engineering of the ECU source code and hardware over the last 8 years... a significant time investment/obsession :) If your aftermarket temp gauge is anything like mine, then there could be a +/- 10C difference between what the ECU reads from the OEM sensor and what the aftermarket one shows. The only way to really be sure on coolant temp is to check the OEM sensor via Consult. The hesitation will be gone at 3000rpm, as this secondary warm-up timing is disabled above 2600rpm. There is quite an abrupt jump in the timing when it is disabled, very noticeable when driving! The best way to disable this feature would be via a re-tune. It might be possible to trick the ECU via a 2-pole switch and resistor on the coolant temp circuit, i.e. wire a switch to flip between the temp sensor and a resistor to force the ECU to see, say, 10C on startup, regardless of the actual coolant temp. After startup you would then manually switch the circuit back to reading the sensor. This would work because if the ECU sees 10C on startup it won't enable the secondary warm-up (i.e. the temp. on engine startup is less than the 15C minimum mentioned above).
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