Q: Idle rough when engine warm.

asked by on May 16, 2016

Starts fine-once engine warms up car idles rough. Can not be driven until engine cools down.
My car has an automatic transmission.

Car idle is rough Inspection $79.99 - $89.99 Get a Quote

There are a few possible problems that could cause these symptoms. It could have a failed coolant temperature sensor, which reports the temperature of the engine to the engine control module. The engine control module uses this info to determine how much fuel to inject for the given engine temperature. It could also have a failed manifold absolute pressure (MAP) sensor, or a bad intake air temperature sensor. I suggest having the system diagnosed by a qualified professional, such as one from YourMechanic, who can quickly and accurately diagnose the rough running and provide you with a suggested repair.

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

I had both axles replaced and car still sqeaks alot what could the problem

Hello, thank you for writing in. The vehicle may be squeaking for a number of reasons. The best way to tell if it is the axles causing the sounds is to isolate the noise with a series of tests. You...

Horn stopped working.

The horn is powered by the fuse you changed out. The control is the horn button and it goes through the steering wheel and clock spring behind the steering wheel. The horn relay gets power from the fuse and control...

My car has some trouble codes and has a rough idle in reverse and drive but is fine in neutral and park.

Hi Justin. Thanks for contacting us today. Trouble codes can be caused by multiple issues ranging from component failures or simply sensor or electrical harness connection issues. However, the best way to determine what is causing the codes is to...

How much does it cost to replace the lug nut stud on a 2006 Honda Pilot EXL

The cost depends on whether it is in the rear or the front and also on whether there is space behind the wheel hub to push out the stud and draw in a new one. If the wheel hub does...

Problem transmission/ i have vibration steering wheel

The vibration in your steering wheel at 70 mph indicates the vibration is in the front end of your car. The most common thing is that the tires are out of balance. If any of the tires had any stop...

Switched to synthetic oil, now I smell burning oil, possibly engine running hotter

Hi, thanks for writing in. Synthetic oil is typically a little bit thinner than conventional oil. Often times when a vehicle is switch from conventional to synthetic this can cause oil leaks or burning oil. I would recommend changing your...

Where is the TCC Solenoid location on a 97 cavalier?

The TCC solenoid location is in the front of the transmission on the top of the valve body (brain of the transmission) in the side pan. If you need further assistance with your TCC solenoid location or replacement, then seek...

Why is my steering wheel and gas pedal locked?

This is a common issue with the Honda CRV. Occasionally, the steering wheel will lock like this when the gears in the steering become slightly misaligned. I have seen this remedied by physically rocking the vehicle back and forth until...

Filling Windshield Water Tank 100%

Hello. Every dealer and manufacturer will have policies regarding certain things. Typically engine damage will not occur if it is completely filled. I do know that most manufacturers, such as Honda, do not recommend it because if it is filled...

Related articles

The Most and Least Expensive Cars to Insure
Car insurance quotes depend on the car make and model. The Honda Odyssey is the least expensive and the Dodge Viper is the most expensive to insure.
The Best Used Cars to Buy If You're an Uber or Lyft Driver
Are Are you thinking of becoming a driver for Uber or Lyft? That could be an exciting career change – you’ll get to meet a lot of interesting people, and if you love to drive, what better way to spend...
The Best Used Cars to Buy If You're a Dog Trainer
If If you are a dog trainer, you expect a lot from your vehicle. You want a ride that is safe, roomy, and of course, dog friendly, since your training operation will often mean that you need to transport the...