Do fuel injected motors have a 'choke'?

Question

Thanks hsueh010

How do they handle the difference between cold motor and hot motor?

Answer 1

No. The car operates in "open loop" or mechanical settings only when the engine is cold.

Once it warms up the loop closes and the computer takes over the timing and fuel/air mix for the best miles per gallon.

The only "flap" that controls air intake is inside the throttle body. This throttle plate has an idle mechanical setting and does not move until you step on the gas pedal. When the throttle body gets gummed up with goop from recycled oil vapors this throttle plate can't suck in as much air at idle and will idle rough and stall the engine sometimes.

Cleaning the throttle body should be part of any tune-up or regular maintenance schedule. Most people ignore it until it becomes a problem and then they spend all kinds of unneccessary money on other stuff they don't need.

Good Luck!

Answer 2

fuel injected cars use an en richer to help the motor start when it is cold. It does what the choke on a carb did, rich out the mixture, more gas less air. Of course modern fuel injection works many many times better than the typical carb.

Answer 3

Fuel injected cars have an automatic fuel enrichment program managed by the computer, fuel injected motorcycles have a manual enrichment which from operators perspective works just like a choke, on my FI bike its a knob you pull out to activate and push in once the bike warms up, it enriches the gas mixture and speeds up the idle.

Answer 4

They have a computer which does the job a choke used to do i.e. inject more fuel per volume air into the combustion chambers when the engine is cold.

Answer 5

Sort of. When the sensors indicate that the engine is cold, the ECU tells the injectors to supply more fuel, while the throttlebody butterfly remains closed. This makes the mixture rich, just like the old "choke".

Answer 6

Yes, kind of. The engine management computer will perform the task of a choke when necessary. When cold conditions are reported to the computer by various sensors, the computer will call for a richer mixture, taking the place of a manual choke.

Answer 7

they do not have a "manual" choke. Some may be programmed, however, to adjust the air/fuel mixture and engine rpm until the engine is warmed up enough to run smoothly and efficiently at idle - in effect, an "automatic" choke

Answer 8

no,
the choke just forces the carburetor to dump more fuel in to the motor.
the computer just adds more fuel in when it needs to, if the car has fuel injection.
the computer and fuel injection systems are always changing the fuel air ratio based on conditions anyway, so there is no need for something like a choke.

Answer 9

Some motorcycle & power sports EFI engines do have a manually operated cold start enrichment circuit ,often marked as a "choke" on the knob, but its not actually a carburetor style choke plate .

Answer 10

Throttle body, no choke. Chokes are only on carburators. Cute Ferret.