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: A/C blows warm air

Hello. It sounds like you may have a weak compressor. The compressor is a pump for the A/C system and when it gets weak, it does not pump as well as it should. When this happens the air won’t be...

Q: Engine turned off while I was driving and wont start back up.

The noise you heard right before the transmission shifter went into neutral was the transmission probably popping a gear. A transmission that is noisy in gear and goes into neutral could have a solution such as adding some fluid or...

Q: not starting up

Hi there. If your S10 isn't starting, it's typically caused by either fuel, air or ignition system components that are faulty. If you've recently replaced the crankshaft position sensor, it's possible that the electrical harness or connection to this sensor...

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...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...