On Monday a Daewoo Kalos is due in, I have never seen it before or even looked under the bonnet of one. The problem description is: MIL light on, does not run well, gets to 50 and sounds like 'an aeroplane' Someone (more than one, possibly) has looked at it and tried various things (shudder)
Generally I would turn something like this away, but things are quiet and the family of the owners boyfriend are customers for the last thirty five years, and they asked nicely.
So, guess away and if I find out what is wrong and fix it, I'll let you know one way or not.