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Discussion Starter · #1 ·
Err Lads.....

I've been driving around for a few days now with this unpleasant high pitched metallic grinding noise coming out of the engine. I always put it down to a dying bearing on either the alternator or any of the other things being pulled about by the pulley system.

Shock and horror this morning when I REALLY put my ear to the 1.8 8v TS lump and discovered it'sactually emanating from the throttle body!!! It's imperceptible at low revs but becomes very apparent at over 2000 rpm. It appears to depend solely on engine revs with engine loading making no difference at all. This kind of points suspicion away from it being induction noise of any kind. Is there anything moving in the throttle body? I always thought it's a mess of injectors and oxygen sensors and the rest of it.

What gives?

Amir "I'm GUNNA sell that 155- honest!!" Isa

Discussion Starter · #2 ·
Maybe something has got stuck in there and it's made a kinda whistle ???
Don't know hoe it would get in though.


106 Posts

had sth similiar - in my case the sound came from a bend vacuum hose, as a side effect it made this whistling sound.
Happened in Italy in the middle of nowhere, first I thought the engine was gone.
I would have never believed that such a small hose could make such a big noise...

Good luck

Amir (but Germany...)

Discussion Starter · #4 ·

Will have a look at that, cheers Amir. Come to think of it the former car, the Masturbishi VR4 made a very similar noise when it had a leak in a vacuum hose.

Would also explain why the 155 is running a bit hotter (as well as smoother and more powerfully). Could be the fuel-air mix is a little lean as a result of the leak.

Obviously grasping at straws now. But let's see.


Amir "Mr. Vacuum" Isa
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