Raspy sputtering on low acceleration.... - TerrainForum.net: GMC Terrain Forum
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post #1 of 9 (permalink) Old 05-08-2019, 08:26 PM Thread Starter
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Raspy sputtering on low acceleration....

So recently I just realized this raspy noise when accelerating. When accelerating from 0-30mph there's this random raspiness that I can't pin point. It's coming from the front. But when I hit higher speeds of 45+mph its completely gone. This is the first time I'm hearing this. I have a AWD 14' V6 with about 61k miles. Any ideas what I can look at would be appreciated.

Last edited by antiks; 05-08-2019 at 08:40 PM.
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post #2 of 9 (permalink) Old 05-13-2019, 10:58 AM Thread Starter
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attached is a sound clip of the equinox at idle with a bit of acceleration...

https://www.flickr.com/photos/218199.../shares/8610E8

Harriman 2 by leebernardo, on Flickr

2014 Chevy Equinox 1LT 3.6L AWD Ashen Grey

Last edited by antiks; 05-13-2019 at 11:05 AM.
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post #3 of 9 (permalink) Old 05-15-2019, 08:38 PM Thread Starter
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So after getting under the carriage I think I have a bad flex pipe.
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2014 Chevy Equinox 1LT 3.6L AWD Ashen Grey
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post #4 of 9 (permalink) Old 05-16-2019, 01:47 PM
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So after getting under the carriage I think I have a bad flex pipe.
AGree . . looks like it with the black showing up there.
IT seems we're back to exhaust systems rusting out again after years of long service with better stainless steel systems.

Daughter with 2014 Sonic and 77K miles had her's blow out last winter. I told her to get it fixed and her hubby says it isn't "Broken bad enough".

I checked with t local muffler repair shop and they have weld in flex section replacements. Would cost about $150 to $180 to fix it.

Or. . replace the whole system for $500 to $800. . . .

2019 GMC Acadia SLT-1 3.6L LGX V6 - Build Date: 4-11-2019 - Bought 6-22-2019

SOLD - - 2015 Equinox LTZ 3.6L FWD Champagne Silver Metallic *Build Date 1-08-2015 *

SOLD with *38,865 miles 8-15-2019.
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post #5 of 9 (permalink) Old 05-16-2019, 02:06 PM Thread Starter
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AGree . . looks like it with the black showing up there.
IT seems we're back to exhaust systems rusting out again after years of long service with better stainless steel systems.

Daughter with 2014 Sonic and 77K miles had her's blow out last winter. I told her to get it fixed and her hubby says it isn't "Broken bad enough".

I checked with t local muffler repair shop and they have weld in flex section replacements. Would cost about $150 to $180 to fix it.

Or. . replace the whole system for $500 to $800. . . .
I ended up dropping it off to my mechanic shop and having them replace the entire y pipe. Was quoted $550 to have it replaced and done. Was hoping to get away with it for a bit longer. But thinking about it I don't want to run into possible sensor and engine issues if it gets any worse. This will just give me a peace of mind that it was replaced with a new part. Rather than just replacing, cutting and welding that flex section.
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post #6 of 9 (permalink) Old 05-16-2019, 03:20 PM Thread Starter
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Also just wondering as well. Would this cause me to have poor gas mileage. At one point I was doing 360mpg or so on a full tank. Now I'm doing about 270mpg.
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post #7 of 9 (permalink) Old 05-16-2019, 06:36 PM
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Also just wondering as well. Would this cause me to have poor gas mileage. At one point I was doing 360mpg or so on a full tank. Now I'm doing about 270mpg.



Yes. . it could cause worse MPG. If exhaust is getting out, it also allows air in during exhaust pulsations. This extra fresh air tells the O2 sensors that the engine is running lean, so the ECM adds more fuel to each fuel injection cycle.
IF the exhaust leak is left unrepaired, it also will foul the catalytic convertor with carbon from that extra fuel.

2019 GMC Acadia SLT-1 3.6L LGX V6 - Build Date: 4-11-2019 - Bought 6-22-2019

SOLD - - 2015 Equinox LTZ 3.6L FWD Champagne Silver Metallic *Build Date 1-08-2015 *

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post #8 of 9 (permalink) Old 05-16-2019, 07:42 PM Thread Starter
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Thanks for the info jay tee.
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post #9 of 9 (permalink) Old 05-17-2019, 09:25 PM Thread Starter
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Had it replaced. Now it threw a cel and code is saying its a Catalytic Converter...

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