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
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.
Recommended Services
| Coolant Temperature Switch (Sensor) Replacement | $103.56 - $422.45 | Get a Quote |
| Oxygen Sensor Replacement | $123.80 - $932.74 | Get a Quote |
| Car idle is rough Inspection | $94.99 - $114.99 | Get a Quote |
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.
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
What others are asking
How do I use the power outlets?
The power outlets allow you to use electronic devices in your vehicle, as long as the car is turned on. Items such as cell phones can be charged with the power outlets. Your car has four power outlets: 1. One...
How do I use the automatic lighting control?
The automatic lighting control is a feature that will automatically turn your headlights on when it is dark out. To use the automatic lighting control, locate the light switch, which is located on the turn signal lever (the turn signal...
Electrical problems with car
Hello. The key issue is probably due to a worn ignition cylinder. Replacing the cylinder (https://www.yourmechanic.com/services/ignition-lock-cylinder-replacement) should do the trick. These vehicles are also known for having the key completely stuck in the ignition due to a failure in the...
Car started stalling after being stopped in traffic - 2015 Infiniti Q50
Hello. There are a few things that can cause this, but the most common cause of this is a failing throttle body (https://www.yourmechanic.com/services/throttle-body-replacement). I have changed a number of these for similar problems. If the throttle body is fine, then...
Squealing coming from brake power booster/check valve?
Hello - your problem sounds like a failed vacuum or fresh air valve in the power brake booster, or possibly a ruptured diaphragm in the booster. And, you are correct that this failure will not lose brake fluid. I would...
How would I know if I need to replace the rotors on my 2016 Mazda 6 sport without removing the tire?
Hello. Thank you for writing in. With the age of your vehicle, it is rather unlikely that you would have to replace the rotors already. The brake pads that stop the rotation of the rotors however do likely need to...
I'm getting power to distributor coil, but I'm not getting power to the spark plugs.
Hi there. Check the spark plugs with a spark adapter tool to see if there is a park induced from the coil. If there is no spark, then the spark plug wires could be burned and need replaced. If the...
The oil gage reads full over, even with the engine not running but ignition on.
The most common cause of the problem can be the oil pressure sender unit needs replaced and and the filter screen below it needs removed and cleaned. When the pressure sensor is removed you should have the oil pressure tested...
Can you tell me how to remove the charcoal canister in a 02 hyundai sonata 2.4l it needs the foam replaced
To remove the canister, perform the following: Remove the two bolts that hold the canister onto the car and drop it down. Then remove the bolts that secure the canister to the shield cover. Disconnect the wiring harness to the...
Related articles
How to Buy a Good Quality Cylinder Head
The The cylinder head is one of the single most critical parts of your car’s mechanics, and one part that can trigger the most engine damage if it becomes compromised. The cylinder head, along with the head gasket, sits on...
Symptoms of a Bad or Failing Low Oil Level Sensor
Common signs include inaccurate oil readings, the Oil Light coming on for no reason, the car not starting, and the Check Engine Light coming on.
How to Replace a Coolant Tube
The bypass hose in the coolant system may have failed when the coolant level is low and there is a visible leak underneath the vehicle.
Browse other content
Maintenance
Estimates