All freelanders have choke?

Hello,

I have noticed in these cold weather and cold start my Freelander rev. And reach approximately 1200 Rpm then decrease to ~ 750 RPm when gets warm( Approximately takes 2- 3 Minutes) My question all Freelnder’s have the same ? Where to locate Auto choke ? Thank u.

 

I don't know, but I would have thought that idle speed was simply controlled by the ECU looking at the temp sensor.

Edit : plus other things such as AC and whether its in gear.

 

Hello GrumpyGel,

from my humble memory Auto choke were exist on Carburetor engine and controlled by choke, newer car uses stepper motor to control it. But My Freelander seems to have an auto choke since it is an Euro specs (VIN tells) maybe !?
Note : coolant temperature sensor has been replaced with new one two months ago.
Thanks

 

It's not "choke" in the literal sense, as choke was a partial close of the throttle butterfly on the carburettor to starve it of air and make it run rich. Nowadays, as Gel said, the "choke" function is done with the ECU using a part of its software to look at the coolant temp and increase the rpm setpoint. As a consequence of this being an RPM setpoint tweak, implemented by a software value and manipulation of the idle air control valve, rather than a physical restriction and adjustment to the Air Fuel Ratio, the engine doesn't run rich or soot up when warming up with this "emulated choke".

 

Is the IACV a stepper motor?

It does appear common that they get clogged up and need a squirt of something (WD40?) to clear them out.

 

I don't know the answer to that specifically on freelanders, but on other vehicles they can either be a servo or a stepper motor, or on some primitive injection systems I've seen them as a solenoid. But the principal remains the same, the ECU actuates the IACV to modulate RPM, whether that be just to stabilise IDLE or whether it be to increase RPM in response to cruise control or low temperature or aircon activation.

 

choke was a separate butterfly that when closed increased the vacuum sucking more fuel into the cylinders,efi just injects more fuel
stepper motors/idle control valves allow a certain amount of air passed the closed throttle butterfly to stop the engine stalling and maintain correct idle

 

I used my old fl1, 1.8 petrol through 2 winters and I can't remember it ever reving higher on start up. It would start immediately and just purr on tickover.

Col

 

Iirc D3 does the same when cold enough, and when its hot and you have a/c on.

 

Completely normal on the KV6.

 

Hi Nodge68,
This is what i want to hear