Rough starts on cold mornings

Before you start it cold, prime the fuel pump twice or three times. Lets make sure you have adequate pressure.

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most likely your engines making a noise because of the oil gets thick when it gets cold. when it heats up it gets thinner. so when you start it cold its running roughly and that the noise you hear. its completely normal don't worry.

Could be bad EGR valve or vacuum leak. Egr valve, depending on whether it is stuck open or closed can act like the old choke thermostats on the carburator system making the vehicle run and idle rough when it is cold OR hot but normally only one or the other. Will run fine cold but rough once it's hot or rough when cold and fine when hot. Check or have someone check for any trouble codes in the system. It can hold codes and not make the check engine light come on and may help diagnose the problem.

have you checked the oil it may be low on oil or you may have a bad cps(cam posistion sensor) so it is not exactly firing correctly you can go to auto zone and they will check the codes for free even if you dont see the check engine light on there will always be some type of codes stored. even codes that say no codes found. this will atleast give you a starting point.

Sounds like a cold start valve (which is actually an additional injector in the intake to assist in cold starting) If you can get it to your local prts store while the light is on they will read the codes for free and tell you what the car thinks is amiss.

You should have 2 02 sensors in your exhaust system. The second one trips the ligt if your emmissions are too high abd it monitors the condition and efficiency of the cat converter. The 02 sensor in front of the muffler monitors the fuel adjustment for too rich or too lean. Now, on a cold start there ias a "cold start valve tha enriches your fuel like a choke. It can be the culprit because the #2 02 sensor is doing its job. The cold start valve can be chk'd to see if it is working by observing it.. It is behind the Throttle body. It should be clicking. Good luck and I hope this helped. Oh, wwhen the engine warms up, and you have clear the exhaust of excess fuel the light should go out.

HAVE THE COOLANT TEMP SENSOR CHECKED TO SEE IF IT IS FUNCTIONING PROPERLY.HOPE THIS HELPS. BEST OF LUCK. LET ME KNOW?

If this happens only when the engine is cold or cool, I would suspect a coolant temperature senor that has lost its calibration.
One way to check would be to have the engine controller scanned when the engine is cool then cold.
The coolant temperature should be the same as the intake air temperature. If the readings are not close to one another, change the coolant sensor.
The coolant temp sensor controls the fuel mixture when the engine is cold, normal or hot.
Good luck, let me know.
Regards,

make sure you have the plugs gapped properly this can also cause this problem

On start (Especially in Cold temperatures)it is harder for the oil pump to bring oil to the top of the engine,making noise more prevalent .Keep fluids level and oil clean and you shouldn't have to worry.