Stock mufflers rattle - Ford Mustang Forum
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post #1 of 5 (permalink) Old 07-09-2019 Thread Starter
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Stock mufflers rattle

2014 V6 with 40K miles. Completely stock.

Wife complains of rattle towards rear of car, I go out start the car, and can plainly hear an annoying rattle with car idling in the driveway. The mufflers are both rattling occasionally, not constantly. After a few minutes of scratching my head, I turn the AC off and presto!, the rattle completely stops. When the ac compressors kicks on and off, the rattle goes on and off. The initial extra load on the motor sends a vibration through the motor, through the head pipes, through the tailpipes and rattles the mufflers. The ac cycle, I'm guessing is 15-20 seconds?

Now I can rap the bottom of the muffler with my fist and they both rattle with the car not running. First of all, is this normal or are there loose baffles in both mufflers? $400 would get two replacement stock mufflers, but I need assurance this would fix the issue. Believe me when I say I've checked all the hangers, clamps, and assorted hardware. I'm leaning toward the mufflers are junk.

The motor idles at approx 650-700. I don't see any fluctuation with the AC on. I don't see an easy stop screw to adjust the idle, guessing it's all programmed. I was imagining another 100 rpm might cure the momentary vibration.

Everything about the car seems normal and it's really been a great car other than this weird issue. If you have any ideas or thought, I'd appreciate input.
Thanks!

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post #2 of 5 (permalink) Old 07-09-2019
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You might try to see what is actually rattling. Mine were hitting suspension and I slid the exhaust back by loosening the 2 clamps in the middle of the car where the mid pipe and the over axle pipe came together. Does not need much or at least mine didn't


http://i124.photobucket.com/albums/p34/Siberexpress/Sterling/Stripes/af58edf0-2e2e-4ffe-a201-405b00a627bc_zpseb5ae052.jpg
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post #3 of 5 (permalink) Old 07-09-2019 Thread Starter
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Thanks Siber. I've looked with lights, mirrors and other's eyes, the consensus is the mufflers are rattling. Suppose I could just yank one out and shake it on the assumption that an internal rattle isn't normal.
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post #4 of 5 (permalink) Old 07-10-2019 Thread Starter
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Quote:
Originally Posted by Siber Express View Post
You might try to see what is actually rattling. Mine were hitting suspension and I slid the exhaust back by loosening the 2 clamps in the middle of the car where the mid pipe and the over axle pipe came together. Does not need much or at least mine didn't

I finally took off drivers side muffler and it rattled like a can of marbles. Ordered a set of Ford Racing by Borla axle back mufflers.
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post #5 of 5 (permalink) Old 07-10-2019
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Quote:
Originally Posted by turbobuick86 View Post
I finally took off drivers side muffler and it rattled like a can of marbles. Ordered a set of Ford Racing by Borla axle back mufflers.
I have the Borla Touring on mine, but the Ford racing are built for Ford so there is some difference. I have my stock mufflers downstairs, those are the ones that rattled but it was hitting the suspension on the left side. I think my car was bottomed out during a dealer transfer though, the case around the tank vent carbon canister was broken and shorted out about 70,000 miles and I know I never hit anything and it was hit on the bottom.

http://i124.photobucket.com/albums/p34/Siberexpress/Sterling/Stripes/af58edf0-2e2e-4ffe-a201-405b00a627bc_zpseb5ae052.jpg
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