Backfire sound on 2016 Equinox - TerrainForum.net: GMC Terrain Forum
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post #1 of 7 (permalink) Old 09-17-2019, 02:26 PM Thread Starter
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Backfire sound on 2016 Equinox

This has been happening for some time and figured I’d see if anyone else has same issue. The sound comes from basically underneath the rear drivers side passengers feet. I know this because I was sitting there as a passenger and it literally felt like it was under my feet. It is a pop which reminds me of a backfire. It only does it once and there is no rhyme or reason to it. Doesn’t always do it in every drive. Does it when the car is hot, cold, Highway, in town, fast or slow. No idea. Anybody have any answers or experience the same thing?

2016 Equinox 60,000 miles It's the Bee's Knees
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post #2 of 7 (permalink) Old 09-17-2019, 02:34 PM
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To me, it sounds like you are running a rich fuel mixture, and the extra fuel is collecting in either the Cat. Conv. or muffler. I would try to replace the O2 sensors. They tend to get lazy, and it is not a bad idea as preventative maintenance. It may save enough fuel to "pay for itself" even if it doesn't stop the back-firing. How is your gas mileage ?

2018 Equinox LT1 1.5 L 4 cyl, AWD, S/R Cajun Red Tintcoat/Black

2010 Equinox LTZ 2.4 L 4 cyl, FWD, S/R Cardinal Red/Black
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post #3 of 7 (permalink) Old 09-17-2019, 03:20 PM
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If you've had it scanned and aren't showing any codes, take it to a mechanic that can put it on a lift, do a thorough inspection underneath and if there isn't anything glaring wrong, his helper can start the car and put it in gear while the mechanic uses his eyes and ears underneath the car. If you're not showing any codes and as you say it only happens once after start up makes me dubious that it's an engine issue, I'm leaning towards something else especially if you have AWD, caveat, I've been known to be wrong more than once, just ask my wife.
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post #4 of 7 (permalink) Old 09-17-2019, 04:12 PM
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#PIP5122E: Pop Noise From Fuel Tank After a Cold Start or EVAP Purge Event - (Nov 2, 2016)
Subject: Pop Noise From Fuel Tank After a Cold Start or EVAP Purge Event

Models: 2010 -2017 Chevrolet Equinox
2010-2017 GMC Terrain

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This PI was superseded to update Parts Information. Please discard PIP5122D.


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The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.

Condition/Concern
Intermittently customers may comment about a pop or multiple popping noise from the rear of the vehicle shortly after a cold start or EVAP purge event.

Recommendation/Instructions
The technician should be able to duplicate the concern by commanding a purge and seal on the EVAP system using GDS2.

As the vacuum reaches 3 to 5 inches, the pop/popping noise should be duplicated.

The cause for this concern is the auxiliary fuel pump in the left side of the fuel tank changing height (spring loaded leg).

The part number on the box of the auxiliary fuel pump has not changed but the auxiliary fuel pump inside of the box has.

After ordering the auxiliary fuel pump, remove it from the box and verify the letters "PPA" are cast into the top of the fuel pump flange.

This is the revised auxiliary fuel pump designed to correct the pop/popping noise. The original auxiliary fuel pump has "POM" cast into the flange.

Important: The condition described in this PI applies only to the auxiliary fuel pump module assembly. The Parts Catalog calls this auxiliary pump component the "Fuel Pump Auxiliary" which is the correct part for this repair. Replacing the primary fuel pump module assembly would NOT correct this noise condition. The parts catalog calls this primary pump component the "Fuel Pump" which is the incorrect part for this repair.

Object ID: 3723460Click here for detailed picture of the image.

 1. Flange location of the auxiliary fuel module (Fuel Pump Auxiliary)
 2. Primary Pump NOT the correct component to replace (Fuel Pump)
Object ID: 3468882Click here for detailed picture of the image.

Parts Information
Part Number
Usage
Description
Qty

22755798
2010-2011 Equinox/Terrain LAF & NT7 or NU5 2012-2017 Equinox/Terrain LEA FHO & NT7 or NU5
Fuel Pump Auxiliary
1

22755799
2010 Equinox/ Terrain LF1 & NT7 or NU5 2011-2012 Equinox/Terrain LFW NU5 2012-2017 Equinox/Terrain LEA FHS NT7 2013-2017 Equinox/Terrain LFX FHS
Fuel Pump Auxiliary
1


Warranty Information
For vehicles repaired under warranty use:

Labor Operation
Description
Labor Time

4028830
Fuel Tank Fuel Pump Module Replacement - Secondary
Use Published Labor Operation Time
bigb12359, buggsy and garagerog like this.

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post #5 of 7 (permalink) Old 09-18-2019, 09:24 AM
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rbarrios is on top of things like usual !!!!!!!!!!
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post #6 of 7 (permalink) Old 09-19-2019, 07:20 AM Thread Starter
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Quote:
Originally Posted by RIT333 View Post
To me, it sounds like you are running a rich fuel mixture, and the extra fuel is collecting in either the Cat. Conv. or muffler. I would try to replace the O2 sensors. They tend to get lazy, and it is not a bad idea as preventative maintenance. It may save enough fuel to "pay for itself" even if it doesn't stop the back-firing. How is your gas mileage ?
. Gas mileage is around 25-27 consistently

2016 Equinox 60,000 miles It's the Bee's Knees
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post #7 of 7 (permalink) Old 09-19-2019, 10:34 PM
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FWIW - My Vue did this the entire time I owned it...about 12 years. All us Vue folks knew there was no need to worry. Other than the 2-3 pops there was never any other cause for concern. If its still under warranty let them fix it...otherwise just leave it and save the trouble and cost. You'll wonder if there's something wrong if you don't hear it from time to time. Rbarrios has got it right - that's the cause.

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2019 Acadia SLE2 - Metallic Grey - Hers
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