Vauxhall Astra screeches & squeals at low speed, now sta

[DIYerHELP]

Hi, not sure if I have the right forum, this one or the Car Repairs below!

Anyway, my Vauxhall Astra has started to screech and squeal at start up and low speeds (under 30mph). Today it has started to misfire/jump at 50mph and stalls at idle.

Any ideas please? Thanks.

 

[Burnerman]

Things you need to check:
Tension on the alternator / PAS belt.
If that seems ok, listen to the engine offside, where the timing belt is. You could be looking at a squealing tensioner or water pump (particularly if there has been some coolant loss). I'm wondering if the timing belt has jumped a tooth.....
John

 

[DIYerHELP]

Thanks John for a quick reply!

I haven't noticed any coolant loss, check this at the weekend before the noise started. It's coming from the offside too, so great advise - thanks again.

Bloody awful noise until the speed picks up, so not going to drive it tomorrow.

 

[Peter.N.]

If it only does it when you first start for a minute or two its most likely the alternator belt slipping. Its trying to rapidly recharge the battery and needs a lot of torque, as soon as the battery voltage starts to rise the power needed by the alternator reduces and it stops slipping.

 

[DIYerHELP]

Thanks Peter... spot on! Found out today that the tensioner has seized, needed a new tensioner and belt.