Noisy when accelerating

[Homer's HSV]

Firstly nothing in the engine bay is loose eg covers and plastic clips broken.
It happens when i just start the car and on hard acceleration its like a rattling noise but only happens as soon as you put your foot down then it quickly goes away the car runs 100% no issues with fuel consumption engine lights etc. It happens with air con on and off going to take it to Holden this week but wanted to know if anyone has had the same issue.

Cheers Eddie

[wez84]

If its only when you hit the pedel hard might be engine ping, its a metallic sounding rattle.
Mine never did it i got a tune and at only does it in a high gear at low rpm
hows the fuel that your using.

[RiCeY]

Sounds like its pinging which is a quick way to kill the engine.

Does it have an aftermarket tune?

What fuel do you use?

[wez84]

HA HA thats what i was getting to except i forgot to it the word pinging in after engine. I will fix it up

[Homer's HSV]

I just came back from a drive from Brisbane and put reg unleaded in it just to see if there was any difference in on my trip back i used it all the way home and still have some in it i have had it tuned if i use what i normally use with is 98 fuel will it go away

Cheers Eddie

[wez84]

yeah mate you should be right

[Homer's HSV]

Thx mate will drive it easy till i nearly run out then put premium back in

But as i wanted to see the difference and normal unleaded was using approx 1.5 litres per 100km more on the highway from Brisbane till home
Thx heaps for the responses was thinking something stuffed up.