Q: Heard a thunk and lost throttle

asked by on

I was on the highway and heard a thunk. I then lost throttle and had to pull over.

There are several possible things that could have happened. If the car is running, but has no throttle response, the throttle body could be bad. This is the part that opens as the accelerator is pressed to let more air and fuel into the engine, with out control, the engine would still run, but unable to rev up. If the car will not start, the timing belt may have broken and the camshafts can’t turn, and the engine will not start. This would be a noisy scenario. I suggest having a qualified technician, such as one from YourMechanic, inspect your vehicle for a proper diagnosis.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1,000 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!
  1. Home
  2. Questions
  3. Heard a thunk and lost throttle

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: Throttle body needs aligning.

Yes, on your vehicle the throttle body does require a relearn procedure after replacement. You do indeed need the factory scan tool, or a scan tool with factory capabilities. Have the experts at YourMechanic a call, they have a wide...

Q: I have an 08 lexus rx350, i hear a clunking at low speed on uneven road. I checked the rear wheel by shaking and I feel some free

What you are describing sounds like a failing CV joint. A CV (Constant Velocity) joint is a shaft that connects the transmission to the wheels, essentially transferring the power from the drive train directly to the wheels. The CV joint...

Q: Mode control on air conditioning does not work.

Your car comes equipped with a possible manual and an automatic heating and A/C system. The automatic system is a set it and forget it system. You set the desired temperature and the car will adjust itself accordingly. The manual...

Related articles

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...
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...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.