Q: If the air is too cold, motor knocks on startup

asked by on

The motor in my 2010 GMC Terrain rattles and kinda knocks when I start it up cold in the morning. The sound goes away but it is just enough to make me concerned that something may be wrong in the engine. Is it possible for the cold motor knock to not be a problem? Can this naturally happen? My car is at 38,000 miles after all, and I always make my scheduled oil changes.

As strange as it may sound, the oil filter that was used during one of your oil changes may be the root cause. GMC Technical Service Bulletin (TSB) 10-06-01-003C has detailed technical information showing that some non ACDelco oil filters do not meet the demands of the oiling system and can restrict oil flow to the valve lifters or cause aeration in the oiling system to the lifters, thus causing a rattle noise on startup. The most likely reason that the noise goes away is that the lifters become pumped back up and it all goes back to normal. My recommendation is to have the oil changed by a certified mechanic from YourMechanic, and make sure the correct ACDelco (or equivalent) oil filter is used and keep up on those oil changes. If the noise persists, then some diagnosis is needed. A certified mechanic can help diagnose the noise with an early appointment, as this noise most commonly happens first thing in the morning.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. If the air is too cold, motor knocks on startup

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: Blown engine, is the repair cost worth it?

My first question to you would be to ask you why the engine is being replaced. Did you already have the problem diagnosed and were told you need an new engine? I would need more information to properly diagnose your...

Q: Struts and shocks

You do have front struts and rear shocks on your GMC Terrain. If you are having any problems with your suspension, or need replacement struts, a certified mechanic from YourMechanic can come to your home or office to service your...

Q: Lexus IS 250 2010 electrical problems

I have checked all the recalls and technical bulletins for this vehicle and there are no known issues that can cause the battery to go dead in 3 three days. I would suggest you observe the vehicle in the dark...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
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...
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.