Squeeling noise from engine bay

[marcuscorvanius]

So this morning i was half way to work and sat in traffic.

 

I could here a real low level, constant squeel noise. One i got to some open road i realised it was my car that was making the noise. I had cambelt change 1 yr ago (15000 miles)

 

it has a rough sounding start motor which i am told by a Skoda master technician is a common issue on the tfsi engines. Not sure if it's relevant but it was also -2 this morning

 

Anyone got any other suggestions?

[Ootohere]

You need to check the Antifreeze Ratio is correct

& that a Water Pump was replaced when required and fan belts are correctly tensioned.

 

As well as all other Service and Maintenance Schedule items are done.

[Phil-E]

It could be a number of things.

 

Most likely related to the aux belt somewhere. Could be the alternator pulley as they are a weak point.

 

Phil

[marcuscorvanius]

Water pump was changed at the same time as the cam belt and coolant changed last services. (12 months ago)

 

Its interesting you mention the coolant as the last 2 really cold mornings my coolant light has been flashing. After looking around people put it down to a dodgy sensor as the level are ok and coolant is good to -28 on the last services

[Guest]

With the engine running and squealing open the bonnet and splash the auxiliary belt with a cup of water.

If it stops squealing you've found the culprit.

Usually just dirt on inner grooved face of the belt causing a glaze to form and then the squeal.

I've often remedied squealing belts by aiming a flow of hot water and detergent at the inner surface while the engine is running using a watering can and extension hose.

Be careful not to foul moving parts and follow up washing with several hot water rinses.

You may need to repeat the procedure.

I hope this helps and you don't have a more expensive problem.

[Aspman]

Won't be the cam belt it's toothed so won't slip and squeal. If it slips there will be a crunching noise, followed by a banging noise usually followed by quiet sobbing.

 

Aux belts can start to slip in the cold weather. Might be worth getting it looked at in case it's on its way out.

[Phil-E]

Aux belts can start to slip in the cold weather. Might be worth getting it looked at in case it's on its way out.

 

Yeah... just seen this morning a member on the facebook group posted a picture up of his aux belt breaking and taking out the cambelt with it!

[marcuscorvanius]

Well bad news chaps I think

 

I had a look at the issue earlier tonight and the noise is like a squeel but its from the opposite side of the engine

 

When i start the engine it seems ok but when its driven for a little while the noise starts and is constant even if you leave it idling in neutral. The worrying thing is that when i then turn the engine off there seems to be a loud hissing noise from the same area of the engine for 30 seconds to a minute before it slowly starts to quieten down and stop altogether

 

Really got me worried this has :(

[Aspman]

Leaking expansion tank?

[marcuscorvanius]

I checked my water earlier and i think it has dropped slightly but not so much it could be a leak

[Phil-E]

Could it be the PCV valve?

 

Phil

[Aspman]

I checked my water earlier and i think it has dropped slightly but not so much it could be a leak

 

I was wondering if vapour escaping could be the reason for the noise. That might not drop the level of the coolant much.

 

My VRS used to make a weird peeping / cheeping noise when it was switched off not long after I got it. It was a like vapour escaping from a seal.

Never did get to the bottom of it and it stopped on its own.

[marcuscorvanius]

This is frustrating me now lol, i seem many posts about similar but no-one has ever got to the bottom of the issue.

 

Il have another try at explaining it and what I tried so far.

 

So when the engine gets up to temperature I notice a squeel / schreech noise this noise often gets a little louder and immediately back to a dull squeel. I doubt it's a belt and i'l explain why further down. I listed with the old screwdriver trick and the noise seemed more noticeable when place on the alternator. I spent £166 on a new on to find it wasn't that lol. 

 

It was then that i realise something else. When i pull up on the drive and its making the constant squeel / schreech I shut the engine off and then as soon as its off the noise continues for about 3 seconds. I say continues once the engine is off its sounds more like i loud chirp than a squeel and that to me rules out any belts or bearing as when i shut the engine off everything stops. The chirping gets quieter and quieter and is then replaced by a loud hiss which again gets quieter until gone

 

I have ruled out the wate   rpump by taking the cap off the expansion tank while the engine is running and the noise is still constant. All I am left thinking is its some kind of valve or pipe

[Phil-E]

Have you checked the PCV valve at the front of the engine?

 

Phil

[marcuscorvanius]

I haven't but looking around forums i cannot see anyone else reporting the same issue with the valve. Mostly people saying about poor idling or fuel consumption.

[Phil-E]

There was a member on here recently with a 1.6 Ocatvia and had a loud screeching/squealing noise.

 

Turned out to be a faulty PCV valve.

 

Phil