Skip the auto shop - Our mechanics make house calls

Q: Choke not releasing upon cold startup.

asked by on

After a cold start up the automatic choke does not release and the engine runs very rough. Once the auto choke is released, the engine performs normally.

A: Hello, the choke relies on 12v heating elem...

Hello, the choke relies on 12v heating element, as it heats up it allows the idle speed cam to lower, allowing the idle speed to decrease as the car warms up. If the heating element has failed it will cause the car to have a higher idle longer than normal till it's heated by the heat from under the hood. To test the choke a DVOM will be need to check power and ground to the choke. You can also check the resistance of the choke coil, if there is an open circuit the choke is bad. To test the choke with a cold engine, apply 12v from the battery to the choke coil at the positive side and see if the arm moves as the heating coil warms up. You my need the aid of a mechanic to perform testing and replacement.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Save up to 30%

Get a quote

What others are asking

Q: Car overheating in heat

These vehicles have electric radiator fans. If the fan is not working I would recommend having the system inspected by a qualified technician. This inspection will include checking fuses, relays, wiring, connectors, and the fan itself. The most likely cause...

Q: Possible valve seat loose

The valve seat is a part of the cylinder head and can not come loose. It is possible to have a broken spring, bent pushrod, or maladjusted rocker arm. This is all work that is associated with the repair you...

Q: Squealing noise coming from engine

Hi there, the Corolla has a timing chain that won't make a squealing sound because there are splines on the inside of the belt/chain to prevent slipping. There are tensioners and pulleys that can wear out over time causing unwanted...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.