View Single Post
Old 06-12-2008, 09:45 PM   #2 (permalink)
Master EcoModder
Join Date: Apr 2008
Location: Earth
Posts: 303

Pushrod - '02 Chevrolet Cavalier
Thanks: 0
Thanked 8 Times in 4 Posts
I have heard that when you start your car (cold) that is uses up to 6 times the amount of fuel that it uses in normal conditions until it warms up and goes into closed loop.
That's a bit of a stretch. I'd say 1.5x is more like it on the coldest of days.

If you do an EOC with a fully warmed up engine, and then start it with the clutch, does it still go through this routine?
No, the ECU is aware of coolant temperature and the O2 sensor is already at operating temperature.
and if so how long does it take to get back into closed loop roughly?
Almost instantly.
I ask because even when the car is warm and I do an EOC, whenever I pop the clutch to start, it seems to start just like I started it with the key and idles high for a while before it settles down. Maybe 30-45 seconds or so. Anyone have any info, links, ideas here. Any input would be appreciated, thanks.
Solution 1: Put the engine back to work so it won't idle.
Solution 2: Take idle control away from the ECU by unplugging the IAC.
  Reply With Quote