Question about 2001 Toyota Avalon

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Fumes enter when outside vents are open. Toyota could not find problem.

I have to keep outside air closed off to prevent fumes from entering inside car. Makes breathing difficulty and sick feeling. Need help!!!

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  • Contributor
  • 16 Answers

Probably exaust manifold gasket leak or the doughnut gasket between manifold and exaust pipe is bad.

Posted on Mar 19, 2014

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Posted on Jan 02, 2017

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SOURCE: i can smell the fuel fumes inside the car when running even when the windows and doors are closed

evap system has a leak in it . dont worry its not raw fuel its only vapors.

Posted on Oct 08, 2008

alicantecoli
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SOURCE: 2009 Corolla defroster

get a small motor bike or scooter and wizz through the traffic jams

Posted on Jun 30, 2009

  • 163 Answers

SOURCE: Toyota Corolla 2008 with 9000

they need to check under your back seat and see if the seal is still working your gas tank sending unit is under your back seat .toyota needs to do this for you

Posted on Jan 14, 2010

  • 10 Answers

SOURCE: hi my toyota cressida 1984

Hi First check that all the grommets under the vehicle is still in place, then check that the exhaust is not leaking anywhere. You can also check the boot rubber and the alignment of the boot.

Posted on Nov 19, 2010

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I have a 2010 Chevy Equinox. The air vents in the vehicle all work except for the drivers side right vent ( to the left of the radio and to the right of the driver ). All vents were working but it seems as...


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I emphasize with you on this problem. If you are smelling fumes you are inhaling car "exhaust" which is extremely dangerous as you know. I have a 1999 Passat that had a "fume" issue that baffled me for over a year. Your description of the conditions that you smell the fumes may not be complete enough for me to definitively say what your problem is but I will tell you what I experienced and discovered on my car. I only smelled the fumes when my heat or AC was on and the car was NOT moving forward. Also, if the AC recirculate button was on I didn't smell the problem as bad. So, what I found was that the car's emission control piping was leaking the exhaust fumes that bypass the pistons and go into the crankcase. These fumes are normally piped back into the intake manifold to be re-burned to reduce emissions. With a completed disintegrated rubber emissions pipe coming off the engine block, the fumes entered into the engine compartment which is sealed from the interior of the car. So, how did the fumes get in my car? Well, when waiting at a red light and with the heat or AC on (no recirculate) the fumes would fill the engine compartment and overflow out the wheel wells and wrap over the hood to the intake vents (near the wiper blades) of the car's interior air system. If the recirculate button is pressed with the AC on, the car's interior air (no exterior air) is recirculated inside the car to cool it faster and I didn't smell the fumes as bad. Also on windy days the fumes didn't get a chance to wrap over the hood and get into the intake vents. Because of the unique conditions that had to occur in order to smell or not smell the fumes it was a difficult problem to solve. By the way, the disintegrated rubber pipe was almost impossible to see and there is no real reference material to read that describes the location and depiction of the emissions plumbing. I hope this helps you!

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1 Answer

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Three things come to mind. You may have an exhaust system leak. Or, the rear hatch is not closing good, or not sealing properly, allowing exhaust fumes to enter the rear compartment. If you drive with the rear windows open, the exhaust fumes will be drawn into the vehicle while the vehicle is moving. Just some ideas on where to look for the source of the fumes. Don't take the problem lightly. The fumes can be deadly, or at the very least, make you ill.

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This issue is caused by crankcase pressure issue.
Normally filtered air enters the engine, runs through the crank case and then is pulled into the intake through the PCV valve. Durning hard acceleration, the PCV valve closes (to prevent explosion of fumes in crank case and blowing valve covers and pan off) and the PCV system reverses, with fumes coming back through the filtered intake.

Usually there is minimal oil that gets back into the air cleaner.

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