Skip the auto shop - Our mechanics make house calls

Q: Rough Idle after warm up

asked by on

My car feels like a heavy thumping while idling at the stop light or in park. I replaced the max air flow sensor and the TSP and also cleaned the throttle body it still thumping no sounds just the feeling it runs smooth but thumping after drive for about 15 mins

My car has 160000 miles.
My car has an automatic transmission.

It sounds as though you may have a misfire. You didn’t mention a check engine light, but normally a misfire would turn it on.Try turning on the key but not starting the car. The check engine light should be lit and then go out when the car is started. This is a bulb check function. If the light is not on, then the bulb is not working and needs to be changed. Either way, I would want to scan the car and check for codes to be sure. Another thing to do is check carefully for vacuum hoses that may have come off or are leaking. Any vacuum leaks will affect the quality of the idle. If you figure you have done all you can, contact Your mechanic to have a technician come to your home or office to check out your car and recommend a solution to your problem.

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: Sound when turning

This suggests your power steering pump may be failing or you have a leak elsewhere in one of the power steering lines. The [power steering]((https://www.yourmechanic.com/services/power-steering-fluid-is-leaking-inspection) system operates on very high pressurized hydraulic pressure (in some cases as much as 300...

Q: Code P0505 will not reset

Code P0505 stands for Idle Air Control (IAC) Malfunction. Anything that affects the idle control system could be the cause. This could be anything from the IAC control circuit (PCM, wiring, etc.) to a mechanical problem such as a vacuum...

Q: Swapping 98 5.9l engine for 96 5.2l

The first clue is the EGR system. One engine has it and the other does not. Even though it may be illegal for you to change your vehicle engine from a 98 to a 96, as long as it is...

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...
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.