Thread: 98 300Tdi noise when cold and under load

Try the manifold gasket/exhaust gasket leaking slightly, don't know much about these but I know the 110 Isuzu's when they leak it sounds like that or even slight "whisle". As everything heats up and exspands it takes up any v small gaps.

i second the manifold gasket theory....

just about to do mine as it is doing similar things..

MMM, I have had a similar noise in both LR diesels Tdi and TD5 and it drives me nuts. Was part of the reason I got ride of the Disco so easily. The LR dealer could never find anything. The Disco used to do it at about 90kph and the Defender does it about85-100kph under load. It sounds like a little piece of tin or something flapping around in the tunnel area. Have not been able to find anything loose. More insulation around the tunnel so I can not hear it or turn the stereo up.
May or may not be the same, drives me nuts.

Pom,
I was just about to ask exactly the same question on here, my 96 300tdi auto started doing the same thing a week or so ago. I was going to record the sound first so I could post the noise. I spoke to Brad at KLR in Penrith he said could be exaust leak or intercooler line leak. I am yet to have a good look.

Stephen

Originally Posted by stephen

Pom,
I was just about to ask exactly the same question on here, my 96 300tdi auto started doing the same thing a week or so ago. I was going to record the sound first so I could post the noise. I spoke to Brad at KLR in Penrith he said could be exaust leak or intercooler line leak. I am yet to have a good look.

Stephen

My mechanically minded gentlemen (i.e not me) will be looking at this on Thurs - so I'll post the result here..... Ta Pom

Well folks, I've had my mechanic look at the exhaust system. And he tells me that all looks well. So back to square 1.....

I had a wierd noise when cold however it had nothing to do with engine temp just outside air temp.Treid everything finally changed the fuel filter cause it was all that was left, noise went away. Got no idea why, only thing i can think of is when the diesel is cold it may not flow quite as well and changeing the filter free'd it up again. When your engine warms up that may be just enough heat to allow the fuel to flow better especially as when it's under load it needs more fuel flow. Cheap thing to check though.

Originally Posted by CraigE

It sounds like a little piece of tin or something flapping around in the tunnel area. Have not been able to find anything loose. More insulation around the tunnel so I can not hear it or turn the stereo up.
May or may not be the same, drives me nuts.

Oh dear, that sounds exactly like the noise I developed on this last trip. It sounded like a tin cover of something rattled loose from the tunnel area. If I had a diff guard I'd go straight there with a spanner. Had a quick look underneath - exhaust is solid all the supports tight. Hope it is found it really rattles sometime.

Fo me though it is a low revs and when coming off the throttle. Under load it is much better if not gone completely.