Skip the auto shop - Our mechanics make house calls

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.

A: As strange as it may sound, the oil filter ...

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?

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

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

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: hole in valve over??????/

I an sorry to hand you this news, but a loud boom followed by a stalled engine and smoke is not a very good sign. If the engine failed while low on oil and overheating at the same time, I...

Q: Metal shavings on variable timing solenoid

Hi there. Finding metal shavings on the tip of your VVT solenoid is indeed not a good thing. The reason why it's not a good indicator is that the VVT solenoid is usually attached next to the cam shaft. However,...

Q: does flushing your coolant system fix mixed fluid buildup?

Hi there. You may have to flush the engine a few times and then run fresh water a couple times until system is clean. Then refill it with the proper coolant and distilled water in a 50/50 mixture. If you...

Related articles

How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...
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.