20 Most Recent 2002 Mercury Grand Marquis Questions & Answers

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Question edited for clarity. Question moved to sub category. That sounds a bit of a mess and all because power to the vehicle wasn't maintained during the battery swap. Likely to be a failed Body Control Module. You need a good local auto-electrician with a $5,000 pro grade scan tool computer for diagnose. You can't fix stuff like that yourself Judy.

I think you mean 'intermittent'. Also, the problems of using abbreviations and lack of information.

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So, when removing the sender, do you have to remove the entire intake manifold?

I am not familiar with this model but often this sort of fault is caused by one of the various inhibitors on the system that stops it's use in a dangerous conditions. Pressing the brake pedal for instance automatically stops the cruise otherwise it would try to speed up when you are trying to slow down. If this is a manual transmition vehicle it will have microswitches on the clutch, gear change, brake and hand brake. Automatics will have them on the brake, gear change and hand brake. Check these microswitches for correct operation.

This sounds most like a worn lock actuator which wouldn't be uncommon. If you need a diagram on how to replace, let me know.

Take your vehicle to a qualified repair shop . We could tell you think's to check , but doubtfull you could .

Need to locate the source of drain. After waiting half hour after shutdown, connect ammeter to car and measure current drain. Then one by one remove a fuse until you see the current go down - note it. Do it with all and check out the circuit with the largest drop. You should be drawing around 50 milliamps ordinarily for your radio clock, radio memory, etc.

Could be your fluid is low.

i would tell you to do fuel pump test's pressure an flow ,voltage drop testing etc..... Do you know what these are ? Testing is the way to finding the problem ! Videos on youtube showing how to do it. Testing Electric Fuel Pump Problems with Voltage Drop Test you can find free wiring diagrams here http://www.bbbind.com/free_tsb.html Do you know what a wiring diagram is , how to read one ? Electric Testing Techniques You Need to Know

Best way is to remove oil pan and weld in a new nut for drain plug, next best is to retap the threads to a slightly larger size and replace drain plug.( get plug then retap to fit the new plug.) may change from std thread to metric to be able to do this. Lastly the least effective way i know of- buy a small rubber expansion plug that fits in and tighten bolt that runs through it to expand the plug. ( this should work for a while till you can get it fixed properly.

There can be a water fitting to the heater hose located under the rear of the intake manifold.

Check the DPFE sensor and the 2 hoses going to it. Has to be on a scanner to see the voltage the DPFE is sending.

Look for a blown fuse on the inside fuse block.

If you want to fix this yourself your going to need to develop some kind of electrical diagnostic skill's . Finding wiring diagrams at www.bbbind.com . watch videos on youtube for basic electrical testing . You'll need to buy a DVOM - digital volt ohm meter . Electrical Series Tools Theory Of Auto Electrical Diagnosis and Repair Electrical Troubleshooting Basics EricTheCarGuy It mite be best for some people to just take it to a qualified repair shop .

Fuel pump relay, 4.6L System overview Relay center box 1, wheelwell, front, LH side

I do not think this is a safe idea, the tank is plastic and if you drive through it you may cause a fire.

Good news! Your car does not have a history of such problems. Now, what could be the answer? I would start with the battery connections and cables. Disconnect the cables and clean the battery posts shiny bright with sandpaper or a pocket knife, or whatever. Then clean inside the battery terminals to also shiny bright. Then look carefully at the thick wires that are attached to the terminals, right where they end. Be sure there is no corrosion there. It can be cleaned with boiling water, if you see any. Have someone check the starter and also the starter solenoid, either of these could be in the process of failing. God bless your efforts.

You need a new switch (rheostat).