Q: Idle rough when engine warm.

asked by on

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

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.

Was this answer helpful?
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. Idle rough when engine warm.

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: Q: How many catalytic converters on the car

This vehicle will have one or two catalytic converters since it only has one bank of exhaust. It is very unlikely that this vehicle even has two catalytic converters. It will, however, have two oxygen sensors for every one catalytic...

Q: Truck won't start after warming up. 1992 Ford-F-150

Hi there. You should check to see if the fuel pump is turning on when it will not start. This can be done by checking fuel rail pressure or listening for the fuel pump to make noise when you turn...

Q: Windshield wiper go to fast and beat hard against the glass.

Hi there. The switch to the wiper system could have a fault causing the wiper arms to move too fast. If you are referring that the wipers are bouncing on the windshield when on the highest setting, then the springs...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...