Question about 2000 Honda Passport

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Vacuum Leak on a 2000 Honda passport

How does one fix a vacuum leak on a 2000 honda passport? Is this something I can do myself, I enjoy working on cars but am not very experienced

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  • kenneydavid Apr 24, 2009

    i think I have located the area of the leak there is a loud hissing on the left hand rear of the engine (left hand as you look at the engine from the front) the right side does not have this sound at all. Can't tell where exactly it is comming from

  • kenneydavid Apr 24, 2009

    there is a loud hissing sound ( sounds like leaking air on the rear of the engine) passengers side of engine 2000 honda passport 4wd

  • kenneydavid Apr 24, 2009

    there is a loud hissing sound ( sounds like leaking air on the rear of the engine) passengers side of engine 2000 honda passport 4wd

  • kenneydavid Apr 25, 2009

    it sounds like it is idling low than normal and not getting enough gas but i can still hear what sounds like air going in does the idle also regulate gas when not pushing on the gas

  • David Melrose May 11, 2010

    Yes, you can do this yourself. It is a little tedious and time consuming and doesn't always end with a solution but it is worth a try. You will need some inspecting tools like a strong flashlight and an inspection mirror. An automotive stethoscope can help. A small vacuum pump and gage is a real plus. Start by looking for vacuum lines that are disconnected or damaged. You can use the light and mirror to look for damage in hard to see areas. the stethoscope with the sensor end removed so that the tube is open can be used to listen for the hissing sound of a vacuum leak around the intake manifold gasket area while the engine is running. If a suspected area is found, you can shoot it with throttle body cleaner or just drip oil on it. If the hissing stops and the engine smooths out--you found the leak. Sometimes the leak is in a vacuum diaphragm that is not accessible. Use the vacuum pump and gage to test that component and see if it will hold vacuum. The EGR valve, fuel pressure modulator, and the master brake booster (and others) can all be tested this way.


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Replace upper intake gaskets. They are made of metal and plastic. A common problem. Do not remove the very top plenum cover gasket.

Posted on May 10, 2009

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A vacuum leak will make the car idle higher than normal. With the engine running you can take carburetor cleaner or throttle body cleaner and slowly spray around the intake manifold. If you come across the leak, the idle should drop momentarily while the carb cleaner plugs the hole for an instant. It could be a vacuum line. Sometimes they are difficult to find. Another source is the check valve on the brake vacuum booster.
Good luck, it is not terribly difficult, you just need to use a methodical approach to finding the leak.

Posted on Apr 25, 2009

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