Vauxhall Insignia 2010 engine rattle/knock

[Jamesk77]

Hello all,

Hoping someone can shed some light on what's causing my car to sound like a bag of nails.

About a week ago started it up after work and there was a very audible knocking (tapping?) Noise. No engine warning lights so I thought maybe a lose exhaust bracket so slowly pulled off, drove fine and noise completely stopped. But today it has returned, again only noticable when idling at a junction and still no faults being reported, drives 100% normal.

Have uploaded a short video with audio.

https://youtu.be/Zv7CI2KCUu8

Thanks

[stevieturbo]

If it's that intermittent random noise during the video...it sure doesnt sound good...although wouldnt be convinced it is the engine itself.

Doesnt even sound like a DMF..although that would be a potential candidate if one is fitted.

or maybe clutched alternator pulley or something

Would really need to see/hear in person to attempt to diagnose.

[GreenV8S]

It's not the only possibility, but a sticking lifter would fit the symptoms of a tapping noise at engine speed after startup that goes away for no obvious reason.
A lifter might stick because of a problem in the lifter itself, or the oil supply to it.

[Belle427]

My Saab has a similar noise but it’s not all the time, it sounds like the gearbox to me. May be worth googling getrag rattle if yours is the same.

[Jamesk77]

stevieturbo said:

If it's that intermittent random noise during the video...it sure doesnt sound good...although wouldnt be convinced it is the engine itself.

Doesnt even sound like a DMF..although that would be a potential candidate if one is fitted.

or maybe clutched alternator pulley or something

Would really need to see/hear in person to attempt to diagnose.

Yes it's the random intermittent knocking noise you can hear in the back ground. Sometimes it is more continuous, but Everytime I got out to record it it would stop. Will try and get a better video.

[JONATHAN_11_80]

These engine do suffer with main and big end bearing failure. This is caused by failed regens dumping diesel into the sump and diluting the engine oil. This happens gradually overtime.

[Hd_scott]

I have exactly this problem !!! Anyone find out the cause and how to fix it

[Markandcaz]

I have a 2009 2.0 cdti. Over 2000 revs it sounds like a trackter. I've gave it an oil change to see if that made a difference, witch it did until the other day and its doing it again. Can anyone point me in the right direction. I'm being told its bottom end. Any advice I can do or isit gone

[GreenV8S]

If the oil change fixed it last time, how about trying that again?