Just had my "Lady in Red" serviced (GT 2.0 - JTS). 60,000 Kms. There is an Alfa recommendation to change the drive belts, so I let the garage do it. First shock was the price for three belts and a few tensioners... oh well. Also repaired at this time was a leaky power steering oil pipe (yes, the PS reservoir did run low twice in the week preceeding - but with no other symptoms than pump noise lock to lock.
Initial drive impressions were OK at normal town and country raod speeds, BUT
On the Autobahn there is now a noticeable high frequency vibration that can be felt in steering wheel, pedals, gearstick... Not (yet) high amplitude, but most certainly a buzz that is faster than RPM by a multiple of two, maybe even four. More than that, the vibration is causing a harmonic resonance in the interior that makes the car sound louder than it was before the service. My instincts are telling me that the mechanic must have slipped the belts somehow. Not much, but something at the top of the engine isn't right. Oh, they also added new spark plugs... That was a price shock too. 30 quid for one plug? Another story. Back to the vibes...
It's been a good 30 years since I maintained my own car. I am happy to pay good money for good work, but the mechanics in this case are saying things like "I can't hear what you mean, sir." and: "Sounds like an Alfa GT to me". It's a multiple dealership (with Renault, Dacia and Nissan) and mine is probably one of very few GTs on their books.
What I do know is noise = energy being used. More noise = more energy being used. My proof of the pudding is that the consumption is up by 2 to 3 mpg. Something is making the engine work a fair bit harder for the same performance.
Anyone any ideas please? What could be the source? What is being driven by the belts that might cause resonance in the car interior?
Thanks in advance for all your sympathy...
Last edited by Eagleskinner; 19-01-13 at 10:48.