Q: My car misfires when it's cold al so idling rough

asked by on July 16, 2017

My car is idling rough and misfires when it is cold outside when it is warm normal temp she doesn't misfire I also noticed my rmps are higher than usual and I smell gas

My car has 195000 miles.
My car has an automatic transmission.

Hello, thank you for writing in. The vehicle may be having one of several issues including clogged fuel injectors, poor compression (metal expands when hot), any of your air intake sensors, or a vacuum leak. The valves and lifters can also form leaks. You will want to check into each of these components until you find the issue. You can also try scanning the vehicle for diagnostic codes to see if the computer has detected any issues. For more help with diagnostics and repairs, contact our service department to schedule an appointment.

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

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

Stalling, misfiring, and erratic idle - 1995 Chevrolet K1500

Stalling and rough idling are usually an indication that the motor is not able to adjust to varying loads. The Manifold Absolute Pressure (MAP) sensor senses engine load and generates a signal that is proportional to the amount of vacuum...

Smell coming from A/C vents

Hello there, a few different items can cause this type of smell in the vehicle. The most common is the heater core, but that has already been checked. Other likely causes would be an exhaust leak, fuel leak, or something...

Car jerking uncontrollably, trouble accelerating, rough idle, cylinder 1 misfire code

Engine misfires can be caused by many different problems, but there are a few suspects that occur more than others. Generally, misfires are caused by either a spark or fuel issue or in cases, a combination of both. Spark related...

Related articles

How to Get BMW Dealership Certified
BMW car dealerships offer automotive technician jobs to mechanics who are certified through the Universal Technical Institute (UTI) program.
A Buyer’s Guide to the 2012 BMW X6
The The X6 is a study in identity crises. While the sleek fastback styling and cozy interior suggest a sporty coupe, the hatchback and SUV platform speak to a weak attempt at imitating a wagon (without the roomy passenger capacity)....
How to Replace a Coolant Temperature Sensor
The coolant temperature sensor switch is not working if the engine emits black smoke. The switch may have failed if the car gets poor fuel economy.