Skip the auto shop - Our mechanics make house calls

Q: After you sit with the car running, the car starts smoking and eventually starts shaking

asked by on

I start the car, car runs fine after awhile and after I park the car and sit with the car still running, it seems as if the engine starts shaking and after awhile starts smoking! Is it overheating? What could be the problem?

My car has 110000 miles.
My car has an automatic transmission.

A: Hi, thanks for writing in. It all depends w...

Hi, thanks for writing in. It all depends where the smoke is coming from. If it is from the exhaust then your engine be running rich and starting to foul out the spark plugs. Have the computer tested to see if any codes are present that could indicate what is causing the smoke. If you see smoke from the engine compartment then you may be running the engine hot due to low airflow over the radiator. Have the cooling fan checked to make sure it is running. If it is running and the vehicle has the AC running and the blower is on or near high then you may be using more energy than the alternator can keep up with. This can cause the radiator fan to not turn as fast as it should and let the temperature to rise if idled for long periods. If you would like help, consider having an expert automotive technician from YourMechanic come to your home or office to inspect and diagnose this issue for you, and make or suggest any repairs as needed.

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・Save up to 30%

Get a quote

What others are asking

Q: Car shorts out and drains battery

Hi. If your battery is draining, then it is not unlikely that there may be a short somewhere in the vehicle. As wiring problems can often times be difficult to detect, I would recommend having the vehicle's wiring inspected by...

Q: Valve cover/gasket replaced car is now shuddering I shop liable

The labor to replace the valve cover gaskets should only be 3.0 hours. The list dealer list price for gaskets are only $50. It sounds like you were charged double of what you should of been charged. You most likely...

Q: I have a dead short and need to know what to fix.

If you feel certain the problem is related to your repair, relay this information to the mechanic. This will give him a starting point in what can be a difficult and time consuming diagnosis. It is possible the wrong part...

Related articles

How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
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.