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.

Engine is misfiring Inspection $79.99 - $99.99 Get a Quote

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.

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


Experienced Mechanic?

Earn up to $70/hr

What others are asking

Saturn vue 2005 check engine light most of the time P0172 errors.

P0172 means the fuel system is too rich; rich beyond the ability of the closed loop system to compensate. It might be a vacuum leak, a mass air flow sensor, or a fuel pressure regulator problem. At that age it...

I Had a diagnostic test for Ford escort. What can I do about the Mass Air Flow sensor?

Hi there. You can remove and clean the Mass Air Flow sensor with an electrical cleaner that is non chlorinated. If the sensor is cleaned out and the light is still on, check the intake hoses from the sensor to...

car will turnover but wont start.

Hello, and thank you for writing in. The vehicle is likely experiencing some issues with control module that communicated between the anti-theft components. Typically when the vehicle is messed with and the anti-theft system goes into action, you will need...

Check Engine Light, dealership quoted me for a coolant control valve replacement.

Hi there, thanks for writing in. The coolant control valve controls the flow of coolant to the engine, the storage tank, and the heater core. A fault with this valve could prevent proper engine starting and reduce your fuel economy...

When I turn ac on it overheats

Your car is equipped with an electric radiator fan. It should come on when the engine reaches a certain temperature. It should also come on immediately when you turn the air conditioning on. While on the move, the fan does...

My SUV is making a grinding noise

The noise may be coming from the transmission torque dampener. The transmission would need to be identified by the dealer as a failed part number on the transmission. If the number on the transmission match, then the transmission should be...

Suburban idling high and won't accelerate

The symptoms that you are experiencing with your Chevy have lead me to believe that your Suburban is experiencing issues with its’ Throttle Position Sensor (TPS). If the TPS is failing, it will duplicate many of the symptoms that have...

How do I cancel the security alarm system?

The security alarm system will be automatically canceled any time a key or remote transmitter is used to unlock the doors, or when a key is used to turn the vehicle on.

Where are the fuses located in a 2012 Nissan Altima?

If one of the electronic components in your car doesn’t work, the first thing to check is the fuse. Fuses act as protectors – if high voltage surges through the circuit, the fuse blows. This prevents damage from occurring to...

Related articles

The Importance of Warming Your Car Before Driving
Scandphoto / Shutterstock.com Many people feel that it’s important to warm a vehicle up before driving off. This has long been the dominant school of thought, dating from when cars had carburetors and many would not run...
A Buyer’s Guide to the 2012 BMW Z4
BMW’s BMW’s entry in the hardtop roadster segment, the Z4 delivers the ideal combination of performance, looks, and standard comfort features. This two seater is not only classically stylish and heavy on extras that aren’t, well, extra, it’s also the...
How to Replace an Ambient Temperature Sensor
The ambient temperature sensor monitors the car's temperature inside and out. This sensor allows the AC to maintain comfortable cabin temperatures.