Skip the auto shop - Our mechanics make house calls

Q: When cold the car misses. Later in the day it runs good. This is a new car to me recently purchased. Morning temps are mid 40's

asked by on

When I fist start and run the car in the morning it missed alot. Later in the day it it runs very good.

My car has 156000 miles.
My car has an automatic transmission.

A: Hello there, many different faults can caus...

Hello there, many different faults can cause your 2004 Hyundai Santa Fe to run poorly when cold. The most likely faults would be a stuck open thermostat, coolant temperature sensor, oxygen sensor, vacuum leak, or exhaust leak. A qualified technician from YourMechanic will be able to diagnose your rough running when cold issue and make any repairs required.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
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・Save up to 30%

Get a quote

What others are asking

Q: Is it better to get it to a garage?

Hi there: Thanks for writing in about the issues you're having with the 2006 Hyundai Santa Fe. The crankshaft position sensor is a critical engine sensor that can cause an engine to shut off without notice or other symptoms. It's...

Q: Can't turn key - 2004 Volvo S60

Hey there. It sounds like your ignition cylinder might be jammed up. I would recommend having a qualified professional take a look at your ignition switch to determine if this diagnosis is correct. If it turns out that your ignition...

Q: Car jerking and hard to start

I wouldn’t jump the gun and replace O2 sensors yet. When the engine is cold and first starts, the O2 sensors are not used until they warm up. A poorly running engine, and/or exhaust leaks, can cause false O2 codes....

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
How to Renew Your Car Registration in Oklahoma(DELETED)
Having your car registered with the Oklahoma Tax Commission is an important part of driving legally in this state. You will need to do this within 30 days of moving to Oklahoma...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.