funny noise when starting from cold!

[jme 350z]

sometimes when i start my z from cold it makes a real fast rattling sound which only lasts a few seconds. could sound like vales or tappets or something any one else had this or heard of it would be great to know thanks. i almost feel that its oil related as the weather is so warm maybe its had an effect.......god knows!!

[captain]

I'm no expert but in my experience lots of cars rattle for a few seconds when cold and this stops when a car is warmed up a few seconds later and the part has expanded with the heat and stopped rattling.

 

I'd only worry if the rattling continues when warm.

[dyla350z]

never had it on the z but have on lots of other moters,i was told its coz all the oil is in the sump&takes a couple of secs for the oil pump to get round,not an expert but would not worry unless its knocking bad,i never rev it for a few seconds.

[jme 350z]

thats what i thought thanks. some people say different oils get round the engine quicker ex castrol. only since the heat really and there is still plenty of oil in there!!

[M13KYF]

have you checked your oil level recently

[Dicky]

sometimes when i start my z from cold it makes a real fast rattling sound which only lasts a few seconds. could sound like vales or tappets or something any one else had this or heard of it would be great to know thanks. i almost feel that its oil related as the weather is so warm maybe its had an effect.......god knows!!

 

Funny you should say that because I was just considering reporting the same thing . Mine’s been with me from new and although it doesn’t do it every time I do get a sort of rattle sound coming from what seems like low down on the left hand side of the engine when I start up from cold.

Don’t believe its oil level related as it doesn’t happen every time but it’s got me thinking what it could be. I’m starting to monitor just when it happens to see if I can get to a point of recreating it when at will so I can demo it to the garage.

[Beavis]

Does it on mine from time to time and especially when its been standing for a while. The oil is correct so nothing to worry. And iirc quite a few members have mentioned this before.

[BulletMagnet]

My mate had a rattling sound too that once the engine warmed up disappeared.

Turned out it was a loose heatshield in the y-pipe.

Removed shield, noise gone.