Hello

 

i hope everyone is well.

 

I would assume this issue may have been asked on here but I can't really find the solution to the noise so thought I would ask.

The wife's car is making a rattling / knocking noise which started yesterday.  If you try and rev the engine the knocking does seem to reduce as the revs reduce  but then goes back to being the same noise.

 

i have attached a video in hope it may give someone an idea of what it could be 

Welcome.

 

Sorry no idea but someone less deaf than me will be along.  Hopefully something simple.

 

?

So has the car been serviced to schedule or manufacturers recommendations, guidelines?

Spark plugs changed, cam belt / tensioner replaced? 

 

 

Alternator bearing would be my guess. You might be able to unplug it in situ and therefore rule in/out, while the engine is running. 

Please note - I am not a mechanic or expert in anything.

 

Hi, welcome.

 

I find lots of different noises from the engine bay on different days and different times, I think it's the various computer programs during their thing for the various circumstances, weather, engine warm/hot/cold, what electric is on.

 

Check your battery's state of charge, about two hours after after the car has been parked up, and see what it is.  If 12.3v or below fully recharge using an appropriate battery changer/maintainer (just driving around often isn't enough).  Try for a full recharge done as long, low and slow as possibly which might take an evening and overnight (or more).  Just because the car starts and the lights seem bright enough and you have no warning messages or symbols doesn't mean that your battery is not in a lower state of charge.  Alternator and battery are related of course, low battery and the alternator is working more.

 

If your car has had the full servicing schedule done (at least) for a 6/7 year old car then you have some reassurance, if not then it just might need servicing (properly).

 

You could plug in a scan tool to see if any error codes are present (you can get a few just from battery being in a low state of charge).

 

Let us know how you get on.

 

Edited 9 January, 20233 yr by nta16
ETA: Please note - I am not a mechanic or expert in anything.