Noise on start up

Hopefully someone can help with this. I bought a used Amica (W reg)
last June. Had a load of niggles, covered under warranty but one
thing is still not rectified and it is really annoying. One of the
things that went wrong was an 'engine plug' of some sort, the garage
had it for 3 weeks while they sorted, had trouble getting the part
apparently as the car was more than 6 years old!! Since having this
fixed when I start the car there is a high pitched noise which gets
higher and faster until I reach revs which take me into 3rd gear
approx and then it stops and is okay from then on, until the next
time I start the engine. The garage thought it was to do with the
Drive belts as there had a 'chirping' noise before and they thought
that was the belts and they tightened them up, when I reported this
latest noise I think they just presumed it was related without
actually hearing the noise!! Does anyone have any idea what this
could be to give me some inkling what this could be, I need to make
sure that it will be under the warranty given to me with the car
which was for 3 years.
Lynn

 

What year car? What engine?

Your best bet might be to take the car to your service center (garage) the
evening before they plan to work on it. Leave it with them overnight so
they can hear the noise the next morning when they come in and start the car
cold.