Question about 2002 Nissan Quest

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Vacuum Diagram manifold - 2002 Nissan Quest

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  • Nissan Master
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Hi Karen,here's a link to some vacuum parts.

Posted on Apr 28, 2013

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Posted on Jan 02, 2017

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Vacuum. Diagram for a 2002 jeep grand cherokee 4.0


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On 4.0L 6 cylinder engines, a molded vacuum tube connects manifold vacuum to top of cylinder head (valve) cover at dash panel end. The vacuum fitting contains a fixed orifice of a calibrated size. It meters the amount of crankcase vapors drawn out of the engine.

On 2.5L 4 cylinder engines, a fitting on drivers side of cylinder head (valve) cover contains the metered orifice. It is connected to manifold vacuum.

A fresh air supply hose from the air cleaner is connected to front of cylinder head cover on 4.0L engines. It is connected to rear of cover on 2.5L engines.

When the engine is operating, fresh air enters the engine and mixes with crankcase vapors. Manifold vacuum draws the vapor/air mixture through the fixed orifice and into the intake manifold. The vapors are then consumed during combustion.

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I found lots of info for you, hope it helps, you will probably like the last one the best:

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I need a vacuum line diagram fo a 1996 Chevy Lumina, 3.1. One line that is not connected to anything, is located at the top of the engine.


Sorry I don't have the diagram, but I do have a diagram of the engine and component locations. Your vacuum system is fairly simple. You have a MAP sensor attached to the air cleaner. I have pasted a picture below. It has one electrical connector and one vacuum hose that goes to the intake manifold or the throttle body.
Behind the right headlight is your evap canister. This will have a hose or line running to the fuel tank. Then it will have another hose going to the purge valve. The purge valve should be close by and it has a connector plus another hose that goes to the intake manifold.
Then you have the PCV hose that goes from the PCV valve in the valve cover to the air cleaner or intake manifold. I think yours just has a hose from the air cleaner and the rest is internal.
There is one more vacuum hose, and that is the bog one that goes from the intake manifold (or throttle body--looks to me like there are a couple of vacuum ports on the back side of the throttle body, and there may be a "T" on one of the hoses) to the brake booster. It this one was off, the engine would not run, as the vacuum draw is large. Please let me know if you cannot figure it out from these instructions and provide a picture, if you can.

MAP sensor:
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purge valve:
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I need a vacuum line diagram


Use a industrial vacume tester, check each port coming off of the manifold, run your lines.

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Hello, I have the 1993 Ford Festiva shop manual in front of me. The vacuum hose on the Fuel Pressure Regulator goes to the intake manifold. The manual says that the fuel pressure is maintained at a constant 36.3 psi, and when the engine vacuum drops (caused by high fuel demand) it causes the fuel pressure to increase inside the regulator. There should be a vacuum diagram on the bottom side of the hood that will help to show you what vacuum port on the manifold that it attaches to. If the decal is gone, look on the intake manifold for a vacuum port that is open and causing a vacuum leak. I hope this helps.

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UNDER THE HOOD IS THE VACUUM DIAGRAM ON A WHITE STICKER. IT IS LOCATED ON THE TOP OF THE HOOD OR ON THE STRUT TOWER. I HOPE THIS EVAP DIAGRAM IS EXACTLY WHAT YOUR AFTER. THANKS FOR USING FIX-YA AND FOR AN HONEST RATING AS WELL. PLEASE KEEP ME POSTED. BEST OF LUCK.

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hmmmm... im not expert in these kind of problem but... try to replace the diagram? it is possible?

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