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Hi, just got alternator, all belts and airflow meter changed at my Grand Vitara xl-7,2004, 2.0td. Still a squealing noise from the engine. just when i am changing gears and the revolutions going down to 1000rpm for a moment ( driving slow). At the moment only when the engine is cold. Any idea what it could be? Thanks for help.
 

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99 Tracker, 5 door, 2L, 4x4
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Did you spin everything by hand when the belts were off??

Can you replicate the noise when sitting parked...

....Philip
 

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I don't see why a gear shift would make any difference to belt noise, however, increased vacuum resulting from the throttle plate closing can produce a high pitched whistle if a joint in the intake is leaking (this used to be a fairly common problem in the days or carburetors), so check the joints around that air flow meter, especially if it's one that's close to, or a part of, the throttle body.
 

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IF the noise presents in conjunction with higher engine RPM (at the end of each gear change), then it sounds like belt looseness / squeal to me. ;) Can you rev the engine while parked and simulate the same noise?

Bad tensioner, wrong belt, contaminated (oil? coolant?) belt, or an accesory gone bad (bound / dragging). Maybe even a pulley alignment issue.
 
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