Q: Knocking when starting from a cold start

asked by on

When I crank my car first thing in the morning after setting all night there is a knocking sound for a few seconds. One mechanic said it was because the oil filter is a sideways one and it takes a second for the oil to get where it needs to be and my other mechanic said it may be the timing chains. Neither one of them can fix the timing chain because they don't have the equipment. But going to the dealer fills my soul with dread!!!! What's your opinion on the knocking. Oh yeah it's been knocking for several months- maybe even a year.....

My car has 120761 miles.
My car has an automatic transmission.

This is somewhat normal as the oil sits down in the oil pan when the car has sat for an extended period of time. When you first start it in the morning, it takes a bit of time for the oil pressure to build allowing the oil to circulate properly throughout the motor. This can cause a bit of knocking and is somewhat normal as long as it does not last too long and is not excessive.

Your vehicle is also equipped with something called a knock sensor which works similar to a microphone listening to the engine and sends signals back to the computer when there is excessive knocking detected. When this happens it retards the timing slightly as a means to protect the motor from potential damage. When this happens it will also trigger the Check Engine Light registering a fault code.

As mentioned above, as long as the knock does not last for an extended period of time, your car should be fine. If you’re avoiding the dealer and would like to have it looked at, consider YourMechanic, as one of our mobile technicians can come to you and diagnose the knocking sound firsthand.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1,000 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
  1. Home
  2. Questions
  3. Knocking when starting from a cold start

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: Intermittent Windshield Wipers move 1/4 of the way

Your windshield wiper motor controller is not able to control the motor to bring it to the park position. The problem is in the wiper motor most likely or the body control module since you have same issue with the...

Q: Location of the door actuator that controls the defrost floor and vents. Controls where the air goes through.

I will tell you where it is located, but it requires the removal of the glove box to access it. In addition, there are

Q: Misalignment

The preferred toe setting in the front for the 2011 Savana 1500 is 0.10 degrees. However, toe can be set anywhere in the range of -0.1 to 0.3 degrees and still be acceptable. If your toe setting is outside this...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
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...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...