2007 Mazda 3 Engine Noise on Cold Startup

2007 MAZDA 3
97,500 MILES • 1.5L • 4 CYL • 2WD • AUTOMATIC
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GERALDTUI
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Engine makes a loud throttling noise when cold started, most noticeable in the morning and after work having been left for 5 hours or more.

Is this a result of the type of oil being used? Or is this something much more serious I should pay more attention to?

I live in NZ where the average temperature during Summer is around 20 Degrees C and Winter is between 10 and 15 Degrees C.
Sep 28, 2014 at 4:38 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
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