Skip the auto shop - Our mechanics make house calls

Q: My truck shakes at traffic lights

asked by on

My truck shakes at traffic lights when hot. The shaking isn't that big but I can still feel it. When I stop at a traffic light my truck shakes for a while, stops, and then starts shaking again. The truck drives and runs very nicely, and I haven't had any troubles with it. I don't have any warning lights on my dashboard such as check engine. When the truck is cold it doesn't shake at all but when it gets hotter when the truck idles it shakes. I've noticed that my rpm needle isn't steady when idling it moves up and down just a little bit up and down, thank you for your help.

My car has 143000 miles.
My car has an automatic transmission.

Hi. The symptoms you describe could be a dirty or malfunctioning idle air control valve. Especially when hot, when the engine gets a leaner mixture of air and fuel, the idle air control will have a greater effect on idle and low speed running. In general, it will not set a Check Engine code either. I would recommend having a rough idling diagnostic completed by a mobile professional mechanic, such as one from YourMechanic, to inspect the problem and replace the idle air control valve if 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!
  1. Home
  2. Questions
  3. My truck shakes at traffic lights

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: 08 ford fusion batt died jumped it now flashers wont go off

Hello, thank you for writing in. The vehicle will go into a security mode when the it's battery dies. What the vehicle wants is for the security system to be shut off and reset. Use the key fob to lock...

Q: Idle sounds real rough

This may be a sign of a failing idle air control valve. The idle air control valve is located on or near your intake manifold that monitors the air intake as it is mixed with fuel prior to being injected...

Q: Engine running rough

Hello! The running rough symptom on your particular vehicle is commonly caused by a clogged or faulty VCT (Variable Control Timing) solenoid. The solenoid uses oil pressure to determine if the timing needs to be adjusted. The oil is filtered...

Related articles

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...
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.
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.