Hilux making a very odd noise

Started today, noticed when I fired it up after work. If you can get what I'm saying, it sounds kinda like that cliche hot rod sound - I thought something might have been poking into the fan, but i popped the bonnet and cranked the throttle cable and it is definitely coming from the motor/engine bay somewhere. My thought was maybe the start motor isn't fully disengaging from the fly wheel, it has been over starting for a while. It starts and runs fine, performs like normal but constantly has that god awful sound, which speeds up relative to the revs. Hopefully my mechanic mate can come look after work. Any ideas?

It isn't very loud at all but definitely noticeable, sounds like something is sticking into something that's rotating. Fucked bearing? I dunno.

Have you asked it to be quiet?????
If not i usualy kick something... it makes me feel a bit better when things arnt workin!
The third option is to wear earplugs when its running and the noise should go away!

If it was my half fucked work ute I wouldn't care, but this is my steed.

Check all idil pulleys on front of engine.
If its got air con my money is on one of them .

Used to have to do mine every 6months to a year but mine did a lot of deep mud and water.

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Its a whine right?

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No not a whine, imagine a piece of plastic stuck in a fan, that's the sound

If you load up the thrust bearing (clutch) does it go away ?

Or water pump, belt idler, alternator etc

Crank pulley loose and flogging the key?
Harmonic balancer rooted?
There under load? Clutch in or out any different?

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When was the timing belt last replaced?

No difference clutch in or out. Mate came around and had a listen with ear muffs and a screw driver (mechanic thing I guess), said the cylinders, alternator etc sound fine. He said it sounds like something is loose and rattling, but no idea what, exhaust manifold or something. His other best guess was that it's dropped an injector. He said to him it sounds like an idling air compressor on a truck. Oh yeah we pulled off the oil filter, the oil isn't contaminated or anything. Off to the mechanic I guess.

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Originally Posted by Chris

When was the timing belt last replaced?

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50,000 KM's ago

Ok... I just turned it on so that the oil filter would take up a liter so I can top up, and the noise is gone...what the fuck

jap import?

Head gasget?

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What year?

Jap import, '92. Don't know about the head gasket, no reason I can think of for it to be buggered, I haven't cooked it or anything. Weird how it just stopped.

I have a Colorado and before that a rodeo, oil changes on the rodeo made it a diff ute, I had injector probs on the Colorado at 75k and they modified the injectors it blew black on start up and sounded like a chaff cutter till in warmed up. All good now.so low oil probably
Yr prob

Not 100% sure about the hiluxs but the surfs dual mass flywheels fall to bits and make a intermittent noise
See if you can have a look in the bell housing for hard black plastic looking bits

The new nissan navaras have the same problem with their dual mass flywheels

What engine? 2L, 3L, 1KZ (Surf)

2L & 3L don't have duel mass flywheel.

Crack off each injector in turn to isolate a problem cylinder / bearing problem. Just make sure to use a flare nut / hydraulic spanner not an open end 17mm!

I started it up again before, got it warm, revved it etc. No black smoke, odd noises etc. Everything seems normal. Perhaps an injector was blocked or packed a sad temporarily? I really don't have the tools, skill or know how to go looking for issues, so if it does it again it'll be off to the mechanic.

3L

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Originally Posted by kokako

What engine? 2L, 3L, 1KZ (Surf)

2L & 3L don't have duel mass flywheel.

Crack off each injector in turn to isolate a problem cylinder / bearing problem. Just make sure to use a flare nut / hydraulic spanner not an open end 17mm!

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iv done a dual mass flywheels on 2 jap import 3L in the last couple of months , nz new ones dont have them tho

should be able to feel the bell housing and feel roughness through the alloy
try the injector trick,mite be an injector but bearings noise dont go away with a diesel, can only move so far before it kisses the head

Don't you love trucks that fix themselves :ORLY:

Next time (if there is a next time) it occurs, might pay to video and upload to PooTube so that we can see / listen?

if its a 2.8 they get alittle noisyer when they get low on oil
just keep an eye on it

and when changing the oil filter run the motor then check it again
and the again a week later, then it should be sweet for a little while

what motor is it? 1kz, 1kd, 3l,5l?

Haha classic

Nothing out of the ordinary as of late, no dramas. I'm curious as to what it was.

wouldnt happen to have been a momentary block in an oilgallery by any chance.a moving part briefly having little or no oil and rattling.,before fault rights itself.