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Cold start exhaust smell !

  

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Happy New Year Scotty, I have a question why do most modern cars when starting cold in the morning leaves a weird exhaust smell or is it the smell of burning gasoline ? I notice this on all of our cars (2010 nissan pathfinder 4.0 L V6 with 52,781 miles, 2016 ram 1500 5.7 L hemi with 47,013 miles, 2016 hyundai elantra 1.8 L 4 cylinder with 46,581 miles ), none of them are burning any oil, this doesn't happen on warm startups. Thanks. 


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yeah many cars stink my wife was griping the other day that her Lexus smelled and I said it's freezing cold outside that's warming up and you just happen to open the trunk with the engine running


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