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2011 Cadillac CTS 1.6 L with a presumed exhaust rattle in…

2011 Cadillac CTS 1.6...

2011 Cadillac CTS 1.6 L with a presumed exhaust rattle in the right front area. What is this noise?

Mechanic's Assistant: Where exactly do you think the noise is coming from? And how long has this been going on?

From the inside of the car it sounds like it’s coming from under the hood in the right front. Sounds like marbles rattle around inside the exhaust pipe. It’s been going on for several months but seems to be worsening. But it is intermittent but can’t be triggered by a road bump

Mechanic's Assistant: Are you fixing your CTS yourself? What have you tried so far?

From the inside of the car it sounds like it’s coming from under the hood in the right front. Sounds like marbles rattle around inside the exhaust pipe. It’s been going on for several months but seems to be worsening. But it is intermittent but can’t be triggered by a road bump

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

If this turns out to be an exhaust issue I will fix it myself. I’ve jacked up a few times to try and replicate it but can’t seem to isolate it underneath. The exhaust from the outside appears stable with appropriate clearances

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Answered in 7 hours by:
3/18/2018
Jerry Newton
Jerry Newton, Cadillac Technician
Category: Cadillac
Satisfied Customers: 5,628
Experience: ASE Master Technician, L1, Master GM Technician. Over 20 years of bumper to bumper GM experience.
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That's the kind of noise that a catalytic converter makes when the ceramic comes loose inside, it bangs around in there and makes a lot of noise, and exactly when and how it makes this noise depends on engine speed, temp, etc. It's not always easy to replicate, but I think I know just the noise you're talking about.

If that's the case, you'll be replacing the right side converter. When you take it off, just shake it, you'll hear the thing rattling around if it's broken loose inside. Left unchecked, the catalyst will eventually break apart and plug the exhaust, so despite being an expensive repair, I wouldn't put it off for too long.

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Jerry Newton
Jerry Newton, Cadillac Technician
Category: Cadillac
Satisfied Customers: 5,628
Experience: ASE Master Technician, L1, Master GM Technician. Over 20 years of bumper to bumper GM experience.
Verified
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Category: Cadillac
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5,628 Satisfied Customers
Experience: ASE Master Technician, L1, Master GM Technician. Over 20 years of bumper to bumper GM experience.

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