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 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. Rough Idle after warm up

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: Car wont start but battery is new and only my headlights work nothing else in the car shows power

Hello there, many common faults will cause your 1995 Nissan Quest to have problems starting. You did great in replacing the battery as this is the most common fault of all time for no start conditions. There are a few...

Q: Cv Axle

Hi there. Once an axle starts making noise, it's best to replace the assembly. The internal bearing have developed uneven surfaces as indicated by the noise. Continued use may result in the axle literally coming apart and leaving the vehicle...

Q: Truck starts but only runs for a minute

The actual fuel pressure and volume should be measured. Be sure the gas is not older than three months. You do have an OBD-II diagnostic system, so check for diagnostic trouble codes and a real time scanner would help pinpoint...

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...
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...
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.