Hi guys, I have a 3.7L and I'm wondering if it's possible to disable the ecu's coolant warm-up timer that's built into it. I've read that it wants to see the coolant temp hit 160 within a few minutes or something similar from startup to go into closed loop, if it takes longer it will assume you have an issue and illuminate the engine light.

Is it possible to either alter or remove this timer in the tune somehow?

I installed a 150L/min electric waterpump (thermostat is removed) which is probably a bit too powerful for the 3.7L, mine takes about 6 minutes to hit 160, and usually around the 8-10min mark my dash temp gauge suddenly drops to zero (obd2 is still showing 160-165), (unless i turn the engine off and on after around 5 minutes which resets the timer). The dash temp gauge will stay on zero even when coolant temps reach 180+, it's only when i turn off the car and let it cool below a certain point and start it again, then I usually get the engine warning light come on once I get into the 160s again. Then the instant i clear the code, the dash temp gauge springs to life to read the correct temp.
I plan to switch to e-fans eventually so hopefully setting them to come on later will allow it to warm up quicker, but in the meantime I'd like to change or remove this warmup count down timer if possible.

Thanks,

Michael

 

Do you have the original pump in the engine?
The timer can be disabled by flashing the computer. But this will affect fuel consumption (warm-up mode).
Why did you put in an electric pump? Why?

 

Install a thermostat, oem stays closed until 187°F (86℃).

 

Nup I removed the impellers from the oem pump.

Ok thanks, so how does one flash the computer?
Oh ok, could you please explain how flashing the computer affects fuel consumption?

I installed the EWP for a few reasons, I have used one in my other car for years and it works great, one less draw on the engine, if it fails it wont leak, plus I discovered my thermostat was stuck open and didnt know the life of the water pump, so was able to substitute both of those with one EWP for the same cost.

 

Yes this is a potential option, but will need to drill some holes in it regardless so that there is some flow through the engine until thermostat opens, as the ewp is on the radiator outlet. I may well go down this route. The main concern Im have is I'm not sure if having the EWP pushing against a closed thermostat would be detrimental to its lifespan or if it will be fine...

 

To reflash a computer, you need to give it to a specialist. But I don't recommend doing this.
With the cooling of our engine (3.5 3.7) we must be careful. Since if you give a lot of pressure with an electric pump, then the 5th cylinder may not be cooled. The engine has input and output through its cylinder. Many machines have an input on the first and an output on the last (or vice versa).
You need to install electric fans (with PWM control) and remove the thermostat altogether. Then you will get the desired result.

 

Sorry could you please explain what you mean by the 5th cylinder might not be cooled if I have too much water pressure? I dont quite understand. If I have lots of water pressure wouldnt this cool each cylinder thoroughly?

Yes electric fans are the goal! Is our clutch fan thermo controlled? If so, at what temps does it activate?

Thank you

 

Sorry could you please explain what mean about the 5th cylinder not being cooled if there is a lot of water pressure? I don't quite understand.

Yes an electric fan is the goal! Do you know how much flow our oem water pumps are capable of producing?

Thanks

 

Sorry, could you please explain what you mean by the 5th cylinder not being cooled if there is too much water pressure? I don't quite understand. I would have assumed lots of pressure would mean everything is getting thoroughly cooled.

Thanks

 

Could you please explain what you mean about the 5th cylinder not being cooled if water pressure is high? I dont understand