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Exhaust smell in cabin

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Old 01-13-2018, 11:26 PM
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RickHuntz
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Default Exhaust smell in cabin

Just purchased a 2017 Grand Sport convertible. There is, what I think, an exhaust smell in the cabin. Has anyone had this? I could use your help. Thanks
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Old 01-13-2018, 11:43 PM
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owc6
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What trim level is yours?

I only ask because sometimes the "new car" smell is pretty potent, but seems to be less "chemical/petroleum" the "higher" you go, and more "leather-like."
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Old 01-13-2018, 11:56 PM
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Originally Posted by owc6 View Post
what trim level is yours?

I only ask because sometimes the "new car" smell is pretty potent, but seems to be less "chemical/petroleum" the "higher" you go, and more "leather-like."


2lt

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Old 01-14-2018, 01:11 AM
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fugly1
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Second owner...?
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Old 01-14-2018, 01:53 AM
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Check your clamps. If that doesn't do it, take it to the dealer.
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Old 01-14-2018, 02:55 AM
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Originally Posted by fugly1 View Post
Second owner...?
Yes 2nd owner
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Old 01-14-2018, 09:03 AM
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Were there any mods to the exhaust system, extensive warranty work, or accidents?
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Old 01-14-2018, 09:24 AM
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I picked up my 2017 GS 2LT on 2/1/17. It's stored in a garage with the windows up. To this day, when you get in there is still an adhesive/chemical smell. During delivery, when the sales guy gave an extensive ~3 hour orientation, I thought I was getting gassed. The smell is lessening over time. I guess I should leave the windows open more but I hate to let dust and dirt in.
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Old 01-14-2018, 11:43 AM
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Let just say the recirculation vs. outside air function on this car is the worst ever!! Not sure why but I have found absolutely no way to cut off or reduce outside smells at will .... ever in this car....
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Old 01-14-2018, 04:46 PM
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Originally Posted by RickHuntz View Post
Yes 2nd owner
You might want to find out what happened to the first owner....
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Old 01-14-2018, 05:42 PM
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Rick, could have been TUNED by the first owner; does it have that perfume smell when you're sitting at idle? Dale
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Old 01-14-2018, 06:56 PM
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Originally Posted by fugly1 View Post
You might want to find out what happened to the first owner....
The owner found out that he was losing his vision. Sold it with only 2,300 miles on it

I’m going to the dealership on Tuesday. Will have them check it out

Thanks everyone

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Old 01-14-2018, 07:37 PM
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Might be from a recent oil change. These cars seem to channel a burnt oil smell thru the AC system.
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Old 01-14-2018, 09:20 PM
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Originally Posted by Classic-Chevy-Guy View Post
Might be from a recent oil change. These cars seem to channel a burnt oil smell thru the AC system.
One possible way that can happen is a "mechanics helper" working the oil change bay doing few dry sumps. It is also IMO why some other dry sump issues occur such as overfill or not using Mobil 1.

99+% of the cars/trucks getting oil change service only require dexos approved oil. That is what is often in the oil change bay and with good mechanics hard to find a newbie may be working the oil change bay.

The easy thing for the person working the service bay to do is pump oil from the 55 gallon drum in the bay. The alternative for a Vette, is for them to go to the parts department, sign out for and carry 10 quarts of Mobil 1 back to the bay.

If they take the easy way out and pump from the drum they just pull the trigger on the fill gun. On a wet sump they can just pull the level fully and get max flow. There is essentially a bottomless pit under the oil fill neck! Do that in a dry sump and oil will quickly spill out the oil fill hole! There are baffles in the dry sump tank and oil must be introduced slowly. (I do my own oil changes and pour the oil slowly. To be sure there are no spills I put a large rag around the filler neck.)

The dry sump tank is next to the engine firewall. The filler cap is on the back side of the tank. If oil spills, it is relatively easy to clean the front and sides of the tank. The back not so easy as there is little room. On the firewall, behind the tank is the cover for the cabin air filter. It is a "flimsy" plastic cover not having a great seal. As the engine oil heats, it heats the tank and will increase the vapor from the spilled oil. The vapor can go past the cabin air filter cover seal and enter the car.

A number of reports of the smell occurring after an oil change and going away in a few weeks. I suspect after the spilled oil has all evaporated. There are other possible areas for an oil spill but I have done all my own oil changes in my 2014 Z51 and Grand Sport have never smelled oil. There has not been any oil spilled!

Just Sayn'. Could check the tank behind the oil fill neck.

Last edited by JerryU; 01-14-2018 at 09:25 PM.
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Old 01-16-2018, 07:23 AM
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Are you really sure it's exhaust fumes? One sure way to tell would be to put a carbon monoxide detector in the car. It should go crazy from fresh exhaust fumes, but not from most other things.

Put it in the car for a while before you start the engine. If being in the car with the engine not running doesn't set it off, then start the engine, and drive for a while like you normally do. If you get an alarm, put the windows down immediately.
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Old 01-16-2018, 01:37 PM
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You don't say if the smell is with the top up or down, at least I didn't see such. Also, you might, like I did, find it interesting that one of the questions on the Owner Survey GM sent me for my '18 I got in September was what I thought of the SMELL of the interior. I've never ever seen such before on a factory survey. The point is... there may be more, or have been more going on with odor than we "unwashed" are aware of.
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