Exhaust leak/misfire

2011 CHEVROLET AVEO
125,000 MILES • 1.6L • 4 CYL • 2WD • AUTOMATIC
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BOBBYPUE DOPEHI
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On my OBD it shows engine misfire no check engine light, coil pack and plugs replaced. I haven't checked coil pack connector voltage yet. I posted a video in the beginning of video you here like a fart sound, I have no car oil leaks at all oil cooler and gaskets replaced, valve and manifold. No gas smell in engine bay the fart sound is very pronounced when A/C is running when off faint but noticeable. Second half of clip A/C on with engine noise, is this a misfire sound or leak somewhere? Cause fart sound with misfire. Regrading fart sound in video: it's best heard, if you play clip with no back ground sound thanks.
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Jun 4, 2019 at 6:29 PM
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JACOBANDNICKOLAS
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Welcome to 2CarPros.

I think I heard it. I need you to check something for me. See if the noise is heard when the AC compressor first cycles on. Also, turn the climate control completely off and see if the noise is gone. Don't have AC or defroster on.

Let me know.

Joe
Jun 4, 2019 at 10:17 PM
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BOBBYPUE DOPEHI
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Took to Firestone it's the tensioner.
Jun 6, 2019 at 6:34 PM
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JACOBANDNICKOLAS
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Welcome back:

I had a feeling it was something that was driven by the accessory drive belt. I don't know if you had them replace it or not, so I am going to add the directions in case you still have to do it. The attached pictures correlate with the directions.

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REMOVAL AND REPLACEMENT
Drive Belt Tensioner Replacement

Removal Procedure


picture 1


Note: To remove the power steering pump belt, do remove the accessory belt in advance.

1. Rotate the tensioner star-nut (1) and remove the accessory belt.
2. Remove the power steering belt. Refer to Power Steering Pump Replacement (1.2L LMU Engine) (See: Power Steering Pump > Removal and Replacement > Power Steering Pump Replacement)Power Steering Pump Replacement (1.4L L95 and 1.5L LV8 Engines) (See: Power Steering Pump > Removal and Replacement > Power Steering Pump Replacement)Power Steering Pump Replacement (1.4L LDT and 1.6L LXV Engines) (See: Power Steering Pump > Removal and Replacement > Power Steering Pump Replacement).


picture 2

3. Remove the accessory belt tensioner (1).

Installation Procedure


picture 3


Caution: Refer to Fastener Caution (See: Vehicle > Vehicle Damage Warnings > Fastener Caution).

1. Install the accessory belt tensioner (1) and tighten to 50 Nm (36.8 lb ft).


picture 4

2. Install the power steering belt. Refer to Power Steering Pump Replacement (1.2L LMU Engine) (See: Power Steering Pump > Removal and Replacement > Power Steering Pump Replacement)Power Steering Pump Replacement (1.4L L95 and 1.5L LV8 Engines) (See: Power Steering Pump > Removal and Replacement > Power Steering Pump Replacement)Power Steering Pump Replacement (1.4L LDT and 1.6L LXV Engines) (See: Power Steering Pump > Removal and Replacement > Power Steering Pump Replacement).
3. Rotate the tensioner star-nut (1) and install the accessory belt.
4. Install the engine front shield at the position of right front wheel.

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Let us know if you have questions in the future.

Take care,
Joe
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Jun 6, 2019 at 7:07 PM