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Yeah, on a short run low temps won’t throw a check engine light. But temps consistently below 90c will. It’s been covered extensively in other threads one of which I linked above. This guys engine temps hit 93-96c which is what you’d expect on a fully warmed engine around the 745 mark with a recalibrated tstat. Then he floors it and temps drop. the engine temps are dme controlled so the car under heavy load activates a tstat heater to open it further and lower coolant temps. Glad this Hamburg tech worked. Like I said it’s a craps shoot with Hamburg tech some work, some don’t.
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