R32 Making Rattling Sound At Night

[r32matt]

I have a R32 Skyline and lately it has been making a rattling noise at night. The noise comes in once the turbo kicks in or once i put my foot about halfway. I can rev the engine all the way out without the noise coming in if i give it a small amount of acceleration. The rattling sounds like its coming from the turbo but im not sure. The rattling also gets faster with the more acceration i give it or the more revs its doing. The rattling noise sounds like metal.

During the day my car is fine and I hear no noises at all. During the night the noise starts but the car still performs perfect. There has also been some nights where there is no noise as well. I thought it might be a bolt loose somewhere in the engine or something becasue it still perfroms well and it doesnt make this noise during the day and only sometimes at night.

Any ideas would be Great!!

Thanks

Matt

[r32matt]

Any Ideas Please?

[MerlinTheHapyPig]

check all the bolts are tight

you can remove the intake pipe to the turbo, and check for excessive shaft play (or any signs that the turbine has been contacting with the housing)

it could also be just an exhaust gasket leak or cooler piping. check this also.

[Primordial]

Check for ghosts or attempt an exorcism.. These things are usually worse at night

[xr8eater]

ha ha

check the manifold heat guard it is prone to a minor rattle

or it may just be a lepracorn thoes clover eating f**kers are in my car for sure

[r32matt]

Thanks,

Ill check those things 2nite. Hopefully its something simple.

[silver gts-t]

ill put money down that when ur boosting its rattling a intercooler pipe against the body...

you hear it at night due to it being more quiet

check to see if theres anything touching

[Primordial]

Ahh! ditto that!

Now that you mention it, I had the same prob!

I just unbolted my IC support and bent it a bit so it wasnt rubbing against the body to fix the prob

[AzzurrA]

i know it sounds a bit silly, but does it sound like someone has a can full of little rocks and are shaking it?

if so, it could be detonation?

(bought on by the cooler temperatures at night)

[Guilt-Toy]

during the day try turning your headlights on for about 5 minutes and drive around and see if you can hear the rattle.

it could be the altinator on its way out

[B0oStEr]

I have a R32 Skyline and lately it has been making a rattling noise at night. The noise comes in once the turbo kicks in or once i put my foot about halfway. I can rev the engine all the way out without the noise coming in if i give it a small amount of acceleration. The rattling sounds like its coming from the turbo but im not sure. The rattling also gets faster with the more acceration i give it or the more revs its doing. The rattling noise sounds like metal.

During the day my car is fine and I hear no noises at all. During the night the noise starts but the car still performs perfect. There has also been some nights where there is no noise as well. I thought it might be a bolt loose somewhere in the engine or something becasue it still perfroms well and it doesnt make this noise during the day and only sometimes at night.

Any ideas would be Great!!

Thanks

Matt

Sounds exactly like detonation to me especially the "sounds like metal" part, actually everything in this post screams internal destruction.

[Cubes]

As it only occurs at full throttle.......

Nights are colder than day, colder air is denser, denser air requires more fuel, fuel can't be supplied as fuel pump is on its last legs and finally.... as the fuel pump is on its last legs the cooler denser air is enough to have it start pinging.

Time to throw it on a dyno for a cheapo power run to see whats going on. Everything you have described indicates this, apart from the faster as engine rev's increase. Unless you mean louder? I have this horrible image in my head of you holding it down going yea see its getting faster, as the detonation becomes more and more intense sounding, but surely a motor couldn't live through such abuse.

So... I'm back at square one.. nfi. Could be a million things.

Get some one to look at it.

[Primordial]

Im probably totally wrong, but wouldnt the the frequency of the detonation increase as revs increase?

The higher the revs, the more detonation you will get per second because you obviosuly have more strokes per second?

[AzzurrA]

but surely a motor couldn't live through such abuse

The old holden 202 did... it pinged for 3 years, constantly....

mind you, its hardly the epitome of technological excellence....

what i want to know is why roughly 50% of cars on the road today seem to ping?

you drive next to them in traffic an you can hear it as they accelerate, and i cringe :

[Cubes]

Combustion pressures...

Have it pinging at low rev's with bugger all load is nothing like have a motor pinging thats making large amounts of power for its capacity.