Q: Why does my Echo rough idles at a red light or stop sign?

asked by on January 19, 2017

Every single time I shift my car into drive with my foot on brake, the car rough idles until I hit the gas. But every time I stop the car, it rough idles again.

The Echo is a VERY smooth drive on the road, it just sucks when I stop at a red light. Engine filter is new. Throttle body and plate has been cleaned. Spark plugs changed out last year. I am lost on what to do.

My car has 172600 miles.
My car has an automatic transmission.

Idle Control Valve Replacement $146.15 - $920.51 Get a Quote

Hello, What you are describing is a common sign of a dirty or faulty idle control valve. The idle air control valve is a small valve on the engine’s intake system that reads the air intake as it comes into the motor. This is controlled by the car’s ECM which uses this information to make adjustments to the air/fuel ratio depending on various inputs such as outside air temperature, intake air temperature, load and various other things. As you accelerate, your car’s engine is receiving a much higher dose of fuel than when at idle and conversely, when you let off the gas pedal, there is a sudden change in this fuel supply as a result of your foot letting off the pedal. When this happens, the job of the idle air control valve is to bring this deceleration down to a slow and smooth idle rather than suddenly cutting off the fuel supply causing the motor to die. When the idle air control valve is not working properly, this cause a disruption in this process resulting in the engine not being able to idle properly. I would recommend having a professional come to your location to diagnose and inspect your vehicle.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

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

What others are asking

engine rpm drops or stalls at stop light on abrupt braking.

Hi there. In many cases, the issue you're talking about is caused by an ignition timing problem; typically related to a damaged crankshaft position sensor or trouble within your ignition system such as the coil or distributor. This can be...

Gas pedal not working

Your vehicle uses an electronic throttle instead of a conventional throttle cable. In this system, the control module receives a signal from the accelerator pedal position sensor. The module then uses this information to control the motor to adjust throttle...

My climate control is not working properly.

This generation of Ram had common problems with the blend doors in the climate control system. They are cheaply made and were prone to failure. This is possibly the cause of your vent issues. Since you mentioned the mirror heaters...

I have a 02 Toyota Camry 2.4L auto trans that won't shift into 4 & OD

Hi Renee. Thanks for contacting us today. The Shifter Position Switch and Neutral Safety Switch are one in the same, but I don't think that's the source of this type of problem. Typically when that component fails, it causes all...

Rough idle when cold

Hello, As a general rule, car engines do not like cold weather and will generally require more fuel in cold operating temperatures. When you start your car in the morning and turn the key to on, the coolant temperature sensor...

Where and how do I check the transmission fluid? 2007 Toyota Tundra

Hi there - there is an oil port on the side of the transmission case where oil level can be checked. Requires getting the truck up on a lift. There is a specific process (and fluid temperature) for this check,...

I turn the key and I hear the starter spinning but it does not crank the engine. Is it the starter or part of it?

If the starter motor turns, but the starter pinion drive gear is not engaging the flywheel and turning the engine, there is a fault with the pinion drive gear and/or the actuating solenoid. The power to the solenoid can be...

Should I replace the timing belt?

Your engines timing belt is recommended to be replaced every 90,000 miles. If you cannot find proof that the timing belt was replaced at 90,000 miles then I would recommend timing belt be replaced. This engine is an interference motor...

Check Engine Light with code P0740

There are a number of symptoms that may accompany a P0740 code, it may be that your car will stall at stop lights, or have trouble shifting, or you may not notice anything at all except your gas mileage is...

Related articles

The Top 5 Selling Cars in Alabama in 2012
2012 2012 was a great year in Alabama for auto manufacturing, but that wasn’t the only bright spot. Vehicle sales in Alabama were also robust in 2012. Nothing much changed in terms of the vehicle types that were most popular...
The Best Used Cars to Buy for Highway Driving
Do Do you spend hours each week on the highway for work? Maybe you just live in a very rural area and have to drive for 30 or 45 minutes to get to the grocery store. Whatever the case, your...
Industry News for Automotive Techs: October 29 - November 4
Toyota and Getaround's smartphone key, future McLaren cars, DMCA car hacking, a fire at Ford's headquarters, and Chevrolet's SEMA 2016 show cars.