My six and a half month yeti has twice emitted the most horrendous rattle, scraping screeching from N/S of engine on start up.  The first time it lasted for four or five seconds and the second time about 1 second. On the first occasion the dealer checked the vehicle and could find nothing wrong.  On the second occasion they suggested monitoring the situation - not ideal. 

Anybody got any ideas?

 

Yellowknife

Such a young car I would persist with dealer could be many things many moons ago getting a lift in a fiat similar noise the all quiet a few miles on woomph lots of smoke and flames starter had stuck on overheated and set oil in sump ablaze all got in time car totaled fire service sent to wrong place with similar name.

Years ago loud screeches on start up usually indicated a loose fan belt. Given modern cars don't have fan belts any longer, I wonder if there are any other belts than can be a bit loose and slip thereby emanating a screeching sound. I'm not aware of any on the Yeti but I could be wrong.

Years ago loud screeches on start up usually indicated a loose fan belt. Given modern cars don't have fan belts any longer, I wonder if there are any other belts than can be a bit loose and slip thereby emanating a screeching sound. I'm not aware of any on the Yeti but I could be wrong.

 

Yes they do!

What do you think runs the alternator, or water pump, power steering pump, oil pump and on many cars the air con pump?

Edited 13 January, 201610 yr by Llanigraham

Yes they do!

What do you think runs the alternator, or water pump, power steering pump, oil pump and on many cars the air con pump?

 

Multi ribbed V belts that's what, as our cars no longer have a fan driven by a belt.

Technically Graham he is correct.

Modern vehicles have Auxiliary drive belts, not Fan belts..

 

The modern vehicles have electric fans, old vehicles had Fans driven by a belt.

 

Quote " What do you think runs the alternator, or water pump, power steering pump, oil pump and on many cars the air con pump?"  Answer...Auxiliary Drive Belt. 

Keep your phone handy and record the noise - it will hopefully give the techs a clue

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Yes they do!

What do you think runs the alternator, or water pump, power steering pump, oil pump and on many cars the air con pump?

Assuming your reply relates to the emboldened part of your post, then no they don't! By definition a "fan belt" drives the fan, not the other auxiliary belt driven equipment. The cooling fans on modern cars are driven by electric motors - what did you think drove them?

OFGS!

 

OK the "fan" is driven by an electric motor, but we still have what most people still call a "fan" belt driving lots of other things.

That's a bit of/sort of a coincidence. I had a horendous scraping and screeching noise a couple of weeks ago. It then went within a few minutes and I put it down to a stone caught in the wheel. I now get the rattling of the remains caught in the plastic tray under the engine. It is driving me nuts.

 

Colin

 

A good point. I didn't consider that because the OP said the noise was coming from the engine area. I had a stone trapped between the disc and the back plate on my Yeti and it made some horrendous screeching and other noises. I just loosened the disc and it dropped out.

It's well worth the OP investigating this possibility.

I've had similar noises from trapped stones in the brake caliper but from what the OP says my understanding is that it occurred as soon as the engine was started and not by the car moving.

 

My first thought was a belt slipping but that wouldn't explain the rattling sound as well. I've not looked at the engine in detail yet - are there any exposed pulleys and belts on the N/S of the engine and is there any possibility that a stone could have been thrown up into the engine bay? Or more likely in through the grille given the size of the apertures!

Maybe a failing clutch in the alternator pulley ?

I could have sworn my tinkering noise was nearside but it was clutch bearing which is offside.

There are no exposed belts, pulleys, etc on the nearside of the engine. If the car was stationary at the time, then it can only be something relating to clutch.... or is there any separate mechanical drive to the cam position sensor that replaces the distributor on modern VW engines?

Maybe a failing clutch in the alternator pulley ?

Goodness!

Do alternators now have clutches?.

My six and a half month yeti has twice emitted the most horrendous rattle, scraping screeching from N/S of engine on start up.  The first time it lasted for four or five seconds and the second time about 1 second. On the first occasion the dealer checked the vehicle and could find nothing wrong.  On the second occasion they suggested monitoring the situation - not ideal. 

Anybody got any ideas?

 

Yellowknife

Further to the above - things I should have made clear in the original post were that the car was stationary having been started for the first time that day and that the noise was similar to what I would imagine if it were a stone stuck between a rotating disc and the back plate. On both occasions the noise stopped abruptly which could suggest a starter stuck and suddenly freeing itself. I did suggest this to the dealer but they dismissed the idea.  

I have been ready on numerous occasions to record the noise but it has never re-appeared.  I do however get some funny looks from my neighbours as my wife starts the car while I kneel with a mobile phone inside the N/S wheel arch.

 

PS the car has only done 2.9k miles

Edited 15 January, 201610 yr by Yellowknife

I do however get some funny looks from my neighbours as my wife starts the car while I kneel with a mobile phone inside the N/S wheel arch.

 

 

 

 

-He must be the new Yeti-whisperer in town

I think if you continue to locate your wife in the wheel arch with her phone, the noise will stop. However, I fear that if you remove said wife from the wheel arch the noise will almost certainly quickly return [emoji23]

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