2005 Mini Cooper S pinging sounds

2005 MINI COOPER S
40,000 MILES • 4 CYL • FWD • MANUAL
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KSAVINO
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hi. when i down-shift or slow down, i hear pinging noises from the back of the car- muffler area. what could this be? does not happen when accelerating. thanks.
Jan 28, 2010 at 7:06 PM
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MHPAUTOS
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Hi there,

Thank you for the donation,

This can often be due to a lean mixture have this checked, you may also have a small exhaust leak up stream of the cat converter.

Mark (mhpautos)
Jan 28, 2010 at 7:31 PM