auto choke on 1990 ls400.

[nick pilbeam]

hi gang. this question may be easy for some but i am struggling, how do you shut off or take down very low the auto choke on a 1990 ls 400, i live on the gold coast in sunny australia & it gives me the pip when i have to start the car a few mins before going out or it runs at 1300 rpm untill warmed up, i have no need for it when it is 25 deg cel at 7 am & gets to 35 by midday, not to forget the petrol it is useing to warm up, any help on this matter would be most welcome. thankyou nick.

 

[Nick M]

All Toyotas with fuel injection have "electric choke". The ECU runs richer when you start the car. The engine is not near hot enough to run at a leaner condition smoothly. The Outside air temp has a smaller role in fuel enrichment than does coolant temperature. The computer watches that the two start at the same temp, and if they are, that is a cold start. As the variance between water and air temp grows, the computer will lean out. This takes a few minutes as you have noticed.

 

[nick pilbeam]

thanks for the reply nick, i understand what you have said,so in short i am controlled by the computer & cannot do anything to lower the electric choke or the high idle, & thats why even when the car is hot & you start it up it revs high for a minute & then settles down to normal idle.thanking you.