View Single Post
Old 01-29-2010, 03:57 PM   #4 (permalink)
cfg83's Avatar
Join Date: Dec 2007
Location: Southern California
Posts: 5,864

1999 Saturn SW2 - '99 Saturn SW2 Wagon
Team Saturn
90 day: 40.49 mpg (US)
Thanks: 439
Thanked 529 Times in 356 Posts
thatguitarguy -

Originally Posted by thatguitarguy View Post
Will it still take a minute if you have to turn you key to start the car at the end of an EOC?
No. Once the engine is warm it takes less than 10 seconds. Sometimes less than 5. I think it goes to closed loop fast when the engine is warm. The ECU/PCM probably looks at the coolant temperature.

If closed loop does look at the coolant temperature, you could probably fool the ECU/PCM into faster closed loop operation by spoofing the coolant temperature sensor. The bad thing about this is the implication (but not the fact) that you could hurt your engine at warm-up. I think you would definitely harm your emissions.


What's your EPA MPG? Go Here and find out!
American Solar Energy Society
  Reply With Quote
The Following User Says Thank You to cfg83 For This Useful Post:
thatguitarguy (01-29-2010)