Skip the auto shop - Our mechanics make house calls

Q: Odd sound on start up

asked by on

I've noticed that whenever I start my engine there is an odd grinding / shearing sound for about a second. It sounds very similar to Startup 1 in this video. It only happens on cold starts. I tried starting my car after I got home yesterday and didn't hear the noise. From what I've been able to find, it seems to be related to the timing chain, but I'd love to hear your thoughts and input as to what other possibilities it could be. Would you also be able to give me estimates / quotes for the various repairs that could solve it as I know it's best to tackle this early before more serious damage occurs. The other day when I was leaving for work I heard an odd grind when I was backing out of my parking spot, but I don't believe this to be related.

My car has 54000 miles.
My car has a manual transmission.

A: Another possibility that is quite common on...

Another possibility that is quite common on the Infiniti G35 is the ABS self checking function. This creates somewhat of a grinding sound that sounds similar and some are louder than others. This may be something best diagnosed by listening to it in person.

If the timing chain had enough slack in it to create this kind of sound, you would have likely already experienced much more catastrophic problems (i.e. a bent valve or worse).

I would suggest not driving or starting it until you have it looked a by a qualified mechanic, such as one from Your Mechanic. One of our mobile technicians can come to your home to diagnose the sound in order to pinpoint what's at fault.

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: Lots of engine noise, car is too new to have this problem

The issue you are experiencing is the engine and transmission during a cold start and warm up cycle. Your driving experience until the engine warms up can be different than after it is warm. There is a manufacturer recall that...

Q: changed gear box from automatic to manual spedoo not working what's the problem

Hello. When you change from an automatic to a manual transmission on this vehicle it will conflict with the electronics of the computer. Once this occurs other systems such as the ABS will not work right. You are going to...

Q: Will my car shut off when it's low on oil or coolant?

The signals you get in your car simply warn you to turn the engine off when the oil and coolant are too low, but will not shut the car off on it's own. When the oil pressure switch detects low...

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...
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 P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...