Q: Engine RPM Oscillates When I Come to a Stop and Thumps When Placed Into Drive

asked by on

Whenever I place the car into Drive, the car makes a loud thump like a glove hitting a boxing bag. When I come to a stop while in Drive, the engine RPM oscillates as if it's stuck in gear (see link). When I place the car into Neutral, there isn't any oscillation. Now I've just had the transfer case and front differential replaced from a 52,000 mile Grand Cherokee. Occasionally, ill get the "Service 4WD" notice. As a side note, there seems to be a whirring in the front right tire. (https://youtu.be/To_C5S0ZPgg)

My car has 88500 miles.
My car has an automatic transmission.

Hello. The throttle issue is likely related to the throttle body or mass air flow sensor needing to be cleaned and tuned. It could be transmission related, but that’s not likely.

The clunking could be related to a bad or failing mount for the engine or transfer case. From the video, it is really hard to tell. If it is a very consistent issue I would blame a mount. A qualified technician should inspect the engine and transmission mounts, as well as suspension, for any play. A certified mobile mechanic from YourMechanic can provide this inspection at your home or office.

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
  1. Home
  2. Questions
  3. Engine RPM Oscillates When I Come to a Stop and Thumps When Placed Into Drive

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: Radio don't work after installing new battery

Hi there, thanks for writing in about your 2009 Dodge Ram 1500. The removal of the fuse is so the connect and disconnect of the battery does not spike the radio. If the battery spiked the radio, then you may...

Q: My car tries to crank but won't start. It sounds like it is not getting gas - 2011 Jeep Grand Cherokee

Hi there. It sounds like it has a bad electronic ignition switch. I have seen a lot of these fail on this vehicle. I usually do a voltage test of the switch, but most of the time it is the...

Q: Q: Hard starting

Hello and thanks for writing in. This could be a few different things, however what you are describing sounds like a faulty fuel pressure regulator. Th fuel pressure regulator is a unit that bleeds off a bit of the fuel...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
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.