Skip the auto shop - Our mechanics make house calls

Q: Intermittent throttle failure upon ignition

asked by on

On first ignition the car loses throttle on next ignition it gains throttle and so on. It's honda n wgn japan 660cc
My car has an automatic transmission.

A: This may be related to a couple of differen...

This may be related to a couple of different things such as a failing idle air control valve or a failing throttle position sensor. The idle air control valve monitors air intake as it is mixed with fuel prior to being injected into the motor. This information is used to make adjustments to the air/fuel ratio. When this is not working properly, this may cause an imbalanced air/fuel load going into the engine which may cause the condition you describe. To avoid any unnecessary repairs, I would recommend having an expert from YourMechanic come to your home to take a look at your car to properly diagnose and repair your vehicle.

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・Fair and transparent pricing

Get a quote

What others are asking

Q: My car's engine intermittently stalls

Hello. If the engine is just shutting off then it may be an electrical issue with the ignition switch or the main relay. If the engine starts sputtering before it turns off and then it starts up again then that...

Q: Car stopped randomly and didn't drive afterwards

Hello, thanks for writing in. The computer will go into a failure mode and may not allow the electronic throttle to open if it detects a major computer or sensor fault. There can be many possible failures that will cause...

Q: The Mercedes service advisor recommend replacing the rotors when they replace the brake pads.

The dealer would like to change the rotors to help prevent any come backs due to bad brake performance, vibrations, etc. It is not always necessary to replace the rotors, but if there is damage to them, like deep scoring,...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
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...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...