Engine vacuum line diagram for 03 grand marquis 4.6

Question edited for a lot of clarity.
Question moved from MISC to correct category.

https://www.google.com/search?q=1991+Mercury+Grand+Marquis+GS+5.0.+Vacuum+hose+diagram&rlz=1C1QJDB_enCA643CA644&sxsrf=ALiCzsbNrlH1W5VV0OAK4h8jTsQrUJYYeQ:1662518015156&source=lnms&tbm=isch&sa=X&ved=2ahUKEwjzjued0oH6AhWShYkEHWqvAisQ_AUoAXoECAEQAw&biw=1920&bih=937&dpr=1

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There is a diagram under the hood with all the vacuum line routing it is either on the hood or the shock tower unless it has come off . It is a color coded diagram .

A little confusing I found 3 fuse box diagrams which cover your car. Not sure but hope it helps.

Mercury Grand Marquis (1998 - 2002) - fuse box diagram
https://www.autogenius.info/mercury-grand-marquis-third-generation-1998-2002-fuse-box-diagram/

Mercury Grand Marquis Third Generation (1998 - 2002) - fuse box diagram
https://www.autogenius.info/mercury-grand-marquis-third-generation-1998-2002-fuse-box-diagram-2/

Mercury Grand Marquis Fourth Generation (2002 - 2011) - fuse box diagram
https://www.autogenius.info/mercury-grand-marquis-fourth-generation-2002-2011-fuse-box-diagram/

I would think your only chance of finding a diagram of the hoses would be to buy a repair manual which cost around $25 and it may not even have the diagram in it.

If you know someone with the same car as yours you can copy the setup!
As far as finding it on-line I doubt you will, there are many sites that sell manuals but once you pay they tell you they don't have the one you need. In other words (SCAM)!!!

Hey Tom Terriffic,here's a link showing your vacuum lines.

Section 03-13: Evaporative Emissions 1995 Town Car, Crown Victoria, Grand Marquis Workshop Manual DESCRIPTION AND OPERATION Evaporative Emission Canister Fuel vapor emitted through the evaporative emission valve (9B593) is stored in two evaporative emissions canisters (EVAP canister) (9D653) . I think you should have 2 engine vacuum lines, one for each canister.


Evaporative Emission Canister Purge Valve


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Evaporative Emission Tube Shut Off Valve The evaporative emission tube shut off valve (9G332) is located in-line between the evaporative emission valve (9B593) and the evaporative emissions canister (EVAP canister) (9D653) . The evaporative emission tube shut off valve control valve is mounted on the fuel tank (9002) by an integral bracket. The evaporative emission tube shut off valve closes the flow path from the evaporative emission valve to the evaporative emissions canister during refueling to prevent overfilling of the fuel tank .

Evaporative Emission Tube Shut Off Valve

SECTION 303-05: Accessory Drive 2006 Crown Victoria/Grand Marquis Workshop Manual DESCRIPTION AND OPERATION Procedure revision date: 03/18/2008 Accessory Drive Printable View (104 KB) The accessory drive system:

• has a single serpentine accessory drive belt with 6 ribs.
• has an idler pulley.
• has an automatic drive belt tensioner.
• is not adjustable.

The accessory drive system provides power to operate components which power other systems. These could include components such as the generator, power steering pump and A/C compressor. Each of these components is equipped with a pulley which is driven by the accessory drive belt. The accessory drive belt is driven by the engine crankshaft pulley. One or more idler pulleys may be provided to facilitate belt routing and alignment. The automatic belt tensioner maintains correct belt tension and compensates for component wear and changes in system load. System load changes can be caused by the A/C compressor clutch engaging or disengaging, or demand changes on other systems powered by the accessory drive belt. To maintain correct operation of this system, it is critical that the correct length drive belt be installed. The pulleys must also be correctly aligned and kept clean.
Accessory Drive Belt Routing

Item Part Number Description 1 8678 Accessory drive belt idler pulley 2 10344 Generator pulley 3 8620 Accessory drive belt 4 3A733 Power steering pump pulley 5 6312 Crankshaft pulley 6 8509 Coolant pump pulley 7 2E884 A/C clutch pulley 8 6B209 Accessory drive belt tensioner pulley Belt Tensioner
Automatic tensioners are calibrated to provide the correct amount of tension to the belt for a given accessory drive system. Unless a spring or damping band within the tensioner assembly breaks, or some other mechanical part of the tensioner fails, there is no need to check the tensioner for correct tension.

For the 4.6L V8:
Firing Order:
1-3-7-2-6-5-4-8
Cylinders:
(back of engine)
4-----------8
3-----------7
2-----------6
1-----------5
(front of engine)

Let me know if this helped...

i found out that it grounds when u put it on the car so u dont need to hook anything to the ground connection. the power goes to the bigger connection. the feild is usually the longer wire of the 2 wires that are left. the third goes to the sta spot

the rev limiter is kicking in.without it in gear thats what it does.check that you have the throttle hooked up correct.an open vacuum will make it idle at 1400 or so not 7000