The ALL Florida Online Corvette Club - View Single Post

**Rich Z** · 02-15-2014, 01:50 PM

Possibly. A lot of tables the PCM references have values and state switching points that are dependent upon the engine coolant temperature. 165 degrees does seem rather low. But it just might be because of the cooler temps this time of year. Do you have an aftermarket radiator in there? Seems kind of odd that a stock radiator would work that efficiently.

How long have you had your car? You might want to wait till you drive it in the heat of the summer before thinking about doing anything about the thermostat. It COULD just have a a 160 degree thermostat with one hell of an efficient radiator in it, and the cooler temperatures outside are influencing what you are seeing. And it has been rather chilly in these parts this Winter.

In any event, if the tuning is presuming a stock thermostat and not the one (or lack of one) currently in your car, it could even cause your PCM to constantly run in open loop, as closed loop mode is normally set to kick in based on the engine coolant temps. So you would be constantly be running in "engine warm-up" mode as far as the PCM is concerned.

I guess buying an already modified car does present some challenges trying to figure out exactly what has already been done to it.

02-15-2014, 01:50 PM	#10
Rich Z Internet Sanitation Engineer Join Date: Mar 2006 Location: Crawfordville, FL Posts: 15,134 Name : Rich Zuchowski	Possibly. A lot of tables the PCM references have values and state switching points that are dependent upon the engine coolant temperature. 165 degrees does seem rather low. But it just might be because of the cooler temps this time of year. Do you have an aftermarket radiator in there? Seems kind of odd that a stock radiator would work that efficiently. How long have you had your car? You might want to wait till you drive it in the heat of the summer before thinking about doing anything about the thermostat. It COULD just have a a 160 degree thermostat with one hell of an efficient radiator in it, and the cooler temperatures outside are influencing what you are seeing. And it has been rather chilly in these parts this Winter. In any event, if the tuning is presuming a stock thermostat and not the one (or lack of one) currently in your car, it could even cause your PCM to constantly run in open loop, as closed loop mode is normally set to kick in based on the engine coolant temps. So you would be constantly be running in "engine warm-up" mode as far as the PCM is concerned. I guess buying an already modified car does present some challenges trying to figure out exactly what has already been done to it. __________________ Last edited by Rich Z; 03-27-2014 at 07:45 PM. Reason: Reversed a couple of terms.... duh.