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Old 01-11-2017, 01:43 AM   #1
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Low RPM noise

Hey guys, complete newb here. I just bought a 2011 SE sedan with a 5 speed and I'm loving it. The only problem I'm having is when I'm in gear and the rpms are low, maybe 2k and under, I'm hearing a rumbling noise during acceleration. It does not happen when the clutch is engaged or the car is in neutral. I suspect it's a heat shield or something else vibrating with the engine under load, but I'm not sure where to start or if this is a common problem. I did poke around the forums but I couldn't find much discussion on it in this year range, but forgive me if I missed something. Any help at all would be greatly appreciated!


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Old 01-15-2017, 10:03 PM   #2
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You could be lugging the engine. (You said accelerating under load under 2000 rpm) These engines make max power at 6000 and max torque at 4200, so pretty low output at under 2k. Lugging makes a distinct sound and resonance that could be vibrating heat shields and stuff. Try downshifting before you accelerate to see if anything changes.
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Old 01-17-2017, 03:09 PM   #3
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Have you checked the passenger side hydraulic engine mount? Mine would make a strange metallic growl under 2K rpm from the engine mount being bad.
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Old 01-17-2017, 03:39 PM   #4
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Thanks for the replies guys. I'm pretty sure it's the engine mount like Miller said so I'm going to have that replaced. I rarely let the RPMs go under 1500 during acceleration so the engine shouldn't be bogging down, although I did say under 2k rpm I meant to say 3k.

"Metallic growl" describes the sound perfectly. I'll replace the mount within the next week or so and post the results.
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Old 01-19-2017, 12:03 PM   #5
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With mine it was pretty obvious that the fluid had run out of it. But that growl you hear is the metal portion of the mount that connects to the engine hitting the metal portion of the mount that connects to the "frame" of the car. They should be isolated by the mount.

Also - only use the Motorcraft mount. Aftermarket ones are way worse than your failed factory mount.
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Old 01-19-2017, 11:59 PM   #6
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Weird. My mounts never made noise, just vibrated the car more. I 2nd getting the OEM Ford mount and you won't find it for less than around $100. I tried the DEA mounts and in under a year I'm shaking again!!
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