Help - diagnose this engine noise - Saab 9-5 Bulletin Board - Saabnet.com
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Help - diagnose this engine noise
Posted by BrianCT [Email] (more from BrianCT) on Wed, 11 Jul 2012 10:15:25
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2005 Arc w/ 110,000 miles. I get a low pitched groaning (or moaning) sound coming from the engine ... when I gradually accelerate the vehicle. The noise seems to be rpm or frequency dependent ... it only happens at a certain spot (rpm) in the acceleration process. When it happens, if I add or take-away just a little throttle ... the noise goes away. I can not make the noise happen when revving the motor in idle. It wont make any noise just cruising down the road .. or when decelerating. Car has to be gently accelerating. Truth be told, I think I heard a faint whisper of this noise many miles ago (say at 50,000). I mean faint - would only last a split second. Now the moaning will last 3-4 seconds .. or as long as the car is in the right rpm band. If anyone might have an idea ... and you need more info - ask away. Thanks, Brian
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