Skip the auto shop - Our mechanics make house calls

Q: Low idle after cleaning carb

asked by on

Hi, I hope to seek some advice... I cleaned my car's carb with carb cleaner, removed the idle air control valve and cleaned it as well (cleaned the parts with my negative terminal disconnected). After cleaning the carb and started the car, I noticed that the idle speed gets low which starts at around 1300 and drops at around 800 within a second after starting. Hope to hear some advice from you guys and thanks in advance!

My car has 305000 miles.
My car has a manual transmission.

A: Firstly, you'll want to verify that you...

Firstly, you'll want to verify that you cleaned the throttle body thoroughly since carburetors have not been used for years. The fact that you cleaned the carburetor and disconnected the battery means that the computer will need to relearn the idle again.

To do this you'll need to warm the vehicle by holding the throttle part open for at least 2 minutes. Let it idle with all of the accessories off for 2 minutes and then turn on the A/C and put it on medium blower speeds and let the car idle for 2 minutes.

By doing this the computer should have relearned the idle now. An idle of 800 RPMs is a good speed for the idle to be at as long as you do not have stalling when you decelerate.

If you need help with getting this done, consider YourMechanic, as one of our mobile technicians can diagnose your idling issue and help you make the necessary repairs.

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

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

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: Battery will randomly die overnight

You may have an intermittent problem with the power relay control box staying engaged after the key is turned off. This would require replacement of the relay box controller module. I'd recommend getting some assistance from a professional mechanic to...

Q: Car won't start

Hello, thank you for writing in. With no response from the fuel system, it is safe to say that there is at least an issue with the level sending system. Considering the fuel level sensor, pump, and filter are all...

Q: Car idles low. What's going on?

Hey there. The engine will need to be checked for vacuum leaks in the PCV system or if the Check Engine Light is on and the idle control valve stopped working. Have a mechanic scan the computer and test the...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...
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.