Exhaust leak/misfire

BOBBYPUE DOPEHI

MEMBER
2011 CHEVROLET AVEO
1.6L
4 CYL
2WD
AUTOMATIC
125,000 MILES

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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3 Replies

JACOBANDNICKOLAS

MECHANIC
108,524 POSTS

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

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Tuesday, June 4th, 2019 AT 10:17 PM

BOBBYPUE DOPEHI

MEMBER
40 POSTS

Took to Firestone it's the tensioner.

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Thursday, June 6th, 2019 AT 6:34 PM

JACOBANDNICKOLAS

MECHANIC
108,524 POSTS

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.

_____________________

Let us know if you have questions in the future.

Take care,
Joe

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