Q: Engine rattles when I I turn on my engine for the first time in the morning. It seems like it only does it when it's cold

asked by on November 14, 2016

My car engine rattles when I turn on the engine for the first time in the morning. It only rattless for a while for about 5 seconds after that the car doesn't do it all day. It only does it when the car has been off for more then 8 hours. I was wondering if it's maybe the timing belt as I've read other comments about this problem and also maybe the engine oil?

Here's the link of the video of how the engine sounds when I turn it on for the first time. https://youtu.be/1nsmncAMRJQ

My car has 90000 miles.
My car has an automatic transmission.

Hello. Most likely, the noise you describe is coming from one or both of the camshaft phasers on your engine. These devices which are operated by engine oil pressure, vary camshaft timing (relative to the crankshaft), enhancing engine performance and fuel economy. Since these devices are operated by engine oil pressure, when the engine is off overnight, engine oil drains out of them, and it take the first few seconds of engine operation to refill them when you first start the engine each day. For those few seconds, a metallic rattle can be heard as you have experienced. While not immediately threatening, they should be replaced when the timing chain service is done on your engine.

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

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

Pulled out ignition fuse and put back, now Lexus isf won't turn over.

Removing the fuse while the circuit was powered might have caused the fuse to open. Both fuses should be tested for continuity. If the fuses are intact and they are securely installed but the car won't start, there's a possibility...

Car is idling rough and missing

This may be a sign of a faulty MAP sensor. The Manifold Absolute Pressure (MAP) sensor senses engine load and generates a signal that is proportional to the amount of vacuum in the intake manifold. The engine computer then uses...

I have an oil leak and dealership is telling me can't be fixed

Hey there. I have never heard of an oil leak that cannot be fixed. Even if the engine had to be replaced. The oil leak can be fixed. I recommend having a different mechanic give a diagnosis of the leak...

Related articles

Pontiac Certified Pre-Owned (CPO) Car Program
If If you’re in the market for a used Pontiac vehicle, you may want to check out cars under their certified pre-owned program. Many manufacturers have a certified pre-owned (CPO) program, and each one is set up differently. Read on...
Symptoms of a Bad or Failing Timing Chain
Common signs of a faulty timing chain include engine misfires, metal shavings found in the oil, and rattling sounds from the engine while idling.
How to Buy a Classic Pontiac
Whether you want to buy a classic Pontiac for yourself or as a gift, here are some tips on buying one for a great value.