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Old 11-18-2012, 12:32 PM   #1
love2drive330CI
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Join Date: Mar 2005
Location: Ft Myers, FL
Posts: 317
My Ride: 2001 330CI
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ryannel2003 My previous car, a Cadillac Seville, had the Northstar engine which was notorious for carbon build-up causing the exact noise you are describing. To cure this I would find an empty stretch of highway, get it up to 55MPH, drop it into 2nd gear and then floor it right before it downshifted to 3rd gear. Then I would let off the gas once it hit about 80MPH and let the car get back down to 55MPH again and repeat. This not only kept the motor free from carbon, it helped with oil consumption (another common issue with the motor).
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ryannel2003	 My previous car, a Cadillac Seville, had the Northstar engine which was notorious for carbon build-up causing the exact noise you are describing. To cure this I would find an empty stretch of highway, get it up to 55MPH, drop it into 2nd gear and then floor it right before it downshifted to 3rd gear. Then I would let off the gas once it hit about 80MPH and let the car get back down to 55MPH again and repeat. This not only kept the motor free from carbon, it helped with oil consumption (another common issue with the motor).
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ryannel2003     My previous cara Cadillac Sevillehad the Northstar engine which was notorious for carbon build-up causing the exact noise you are describingTo cure this I would find an empty stretch of highwayget it up to 55MPHdrop it into 2nd gear and then floor it right before it downshifted to 3rd gearThen I would let off the gas once it hit about 80MPH and let the car get back down to 55MPH again and repeatThis not only kept the motor free from carbonit helped with oil consumption (another common issue with the motor). 
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