Some strange noise like tarr....tarr from dashboard at 1500 to 2000 RPM. This problem occurs only at morning for first 10 min (when temperature gauge is more towards 'C'). After driving 10 min no further noise. Another thing i noticed when i reviving engine (specially in morning) at neutral gear (0 speed) then same noise appears. Why such problem occurs for particular band of RPM? I reported (but couldn't duplicate) this problem to TASC at first service but could not resolve.