Skip the auto shop - Our mechanics make house calls

Q: noise when starts cold

asked by on

My GMC Sierra with only 4000 miles on it makes a rattling noise when it starts. Then the noise stops after hitting 210 temperature on it. This only happens in the mornings. It sounds like something is loose or just vibrating against other metal. I don't have any other problems with my truck. It's just the noise. It doesn't sound like a piston slap. Do you have any idea what is causing the noise?

Hello. This noise typically comes from the valve train. It is due to the design of the variable valve timing system. It is normal to make some noise, but it becomes worse if the wrong oil weight is used or if a good quality filter is not used. It can also be an issue within the system that needs to be checked such as a failing lifter. If you want to have it inspected, consider YourMechanic, as a certified mechanic can come to your home or office to diagnose what’s causing the noise.

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・Fair and transparent pricing

Get a quote

What others are asking

Q: Timing belt broke

I believe that you are right: your drive belt is broken. Unfortunately, this happens to everyone at some point. The best course of action is just to replace the belt. I don't believe anything happened to any internal engine parts...

Q: Torque converter goes in/out of lock up at cruising speed

Thanks for writing in about your 1999 Chevrolet Suburban. There are DTCs (diagnostic trouble codes) that will indicate faults with TCC solenoid and brake pedal switch circuits. A scan tool can be used to observe brake pedal switch position while...

Q: I sometimes hear a rattling noise when shifting into second gear. 2013 Toyota Corolla

Hi there - the rattling noise you hear is probably a loose heat shield or other metal bracket attached to the engine. The combination of vibration and engine torque produced while accelerating is the source of rattle, assisted by a...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.