Mechanic Advice

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Gas smell only on cold start? (self.mechanicadvice)

submitted 1 year ago by theragu40 to c/mechanicadvice

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I drive a 2008 4runner with 85k miles. It's been receiving by the manual maintenance for its whole life.

Recently I have started noticing a gas smell when I start the car in the morning. It seems to dissipate after a few minutes. I also don't really notice it on subsequent starts on the same day if I take the car out multiple times. Or if I do, it's less pronounced.

There is no visible leak or gas on the driveway that I can see.

Any ideas? I'm planning to take it in but figured no harm in asking here to see if anyone knows what I might be dealing with first.

Thanks!

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[–] Everythingispenguins 2 points 1 year ago (2 children)

Is this gas smell only outside of the vehicle or can you smell it inside. If it is inside that is a much bigger problem. As brain cells and gasoline don't get along.

So a few thoughts - Could be normal because of the cold start. Though if this is a new thing there is probably something new that is being exasperated by the cold start.

Hole in the exhaust system. This is letting you smell the normal exhaust smell where you are not used to smelling it. (Still dangerous to the brain)

You have a leaky fuel injector which is leaking into the cylinder and causing an extra rich start. This would be more likely to cause the smell on hot restarts.

Leak in the fuel system. Which goes away after the engine is warm due to expansion resealing a gasket or something.

Do to the dangers associated with fire and brain cells quitting. I would recommend you take it in sooner than later. You will probably have to leave it overnight so they can do a cold start on it.

[–] theragu40 1 points 1 year ago

Just checked this morning and it is not detectable inside the car. And it is definitely stronger near the exhaust (and/or is coming from the exhaust).

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