Fluttering noise in engine while accelerating at a fast rate
Only when I accelerate at a quick rate do i hear the slight fluttering noise...I don't hear anything if I accelerate at a slower rate. The fluttering noise quits when I reach my desired speed. But no matter how slow or fast I am going, I hear the fluttering noise the whole time I am accelerating at a fast rate.
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This sounds on the base of it to be pre ignition, if so the moment you take the foot off the gas it goes? The cure is to retard the ignition timing slightly, have you recently changed your octane of fuel? this will also cause this? The noise is caused by the expansion of the compressed gases expanding before the piston reaches top dead centre causing the piston to \'rattle\' left unchecked will cause permanent damage and engine failure
It sounds like the engine is "pinging" as you are speeding up. If so, this is often caused by plugged EGR passages at the intake elbow or a non-functioning EGR valve. The EGR valve allows a small amount of exhaust gasses back into the intake manifold to slow and cool the combustion down slightly to prevent the fuel from burning too fast [which we hear as a pinging sound] and it helps reduce emissions at the tailpipe. When the valve quits working or the passages get blocked the pinging sound will be heard when accelerating or at higher speeds & heavier loads. Pinging is not good for an engine and should be checked out as soon as possible. A quick test drive with a good service tech should quickly narrow down the cause of the noise. Hope this helps and good luck!