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: Over heating but water is flowing through radiator

Hi there, there are a number of things that can cause a vehicle to overheat. The water flowing through the radiator can be a little misleading. Here is a list of possible causes: Thermostat Water pump Clogged radiator. Inside...

Q: Q: Starts then dies

When the engine is in crank mode the fuel pump relay is energized by ignition start signal. Once the car starts the fuel pressure relay is energized by the oil pressure switch. If you have fuel pressure during crank but...

Q: Transmission tapping on a 2011 Honda Accord

Automatics do have automatic clutches, but you have to rebuild the transmission to replace them, which on a 2011 Accord, a full rebuild starts at about 4,000 dollars. So just change the fluid in it every 30,000 miles and don't...

Related articles

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...
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...
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...