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Grand Marquis

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Question
Loud bang when downshifting to passing gear
There are multiple possibilities that could be causing this issue. It is possible that your transmission fluid is low. It is also possible that your transmission fluid has never been changed. Either of these can be resolved by replacing the...
Question
Car wont start and the battery is great.
Hi there. Check the throttle position sensor on the throttle body and see if the sensor is working properly. The sensor is common to fail and cause the engine to not restart. I recommend replacing the throttle position sensor and...
Question
What is this part called ?
The round disc you see is just a rubber plug that covers the access port to the transmission torque converter drain plug. If you are leaking oil from this location you will need to first see if it is engine...
Question
Gas gauge stays at full was fine until I replaced the fuel pump/sending unit
Since you took the fuel pump and sender from another vehicle then it most likely needs a new fuel sending unit. The sending unit is most likely corroded from sitting in an empty tank for who knows how long. You...
Question
Rear End Differential Fluid
You should only have the differential serviced when you have a leak on the rear cover or an axle seal has leaked and needs replaced. The gear lube should not need replacement unless a problem is present.
Question
Transmission problem?
Hi There, What you are describing sounds like a problem generally connected to the flow of transmission fluid. Since you have checked the fluid and it is full, this would suggest you may have a faulty solenoid or bad valve...
Question
Vehicles Check Engine light blinks and then stays on, runs rough like on 6 cylinders/misfiring when wet.
Hi there. Check the spark plugs and see if they are sparking. Get a code reader and check for any codes that could be stored in the computer as the check engine light is on. The code will give you...
Question
Stuttering with check engine light
If you are having an electrical system problem that is causing the lighting and other systems to have erratic issues then you need to check the alternator wire connections on the back of the alternator for loose or bad connections....
Question
I have a 2000 Grand Marquis my girl crashed up the front end so I need some aftermarket body parts.
Billing question sent to CS for the cost of aftermarket parts to repair the front end after a crash.
Question
Transmission problem
Of course, be sure the transmission fluid level is correct, the fluid is not contaminated and the filter is not clogged. A fault like the one you are describing is likely to be due to a hydraulic control issue. If...
Question
Runs rough and misfires
Hello. The trigger system that your codes may be referring to could be the crankshaft or camshaft position sensors. Many engine management systems use these signals as a trigger point for their ignition systems. It could be possible that there...
Question
Racing engine
The idle may be high due to a vacuum leak at the pcv hose where it connects to the back of the intake manifold. It gets a hole in it causing a large vacuum leak. The hole may change in...
Question
Car won't shift out of park.
Hi there. The shifter interlock solenoid could be shorting out causing a draw on the vehicle. Turn the key on to the 'ON' position and step on the brake pedal. Try putting the transmission in neutral. If the shifter will...
Question
I need to replace the master cylinder brake on my 1988 Grand Marquis
The brake master my need to be replaced but you still need to locate the leaks first if you are losing fluid. You should have every brake line checked to see what is leaking. If the lines are rusted and...
Question
Hesitation
The first thing to try is to disconnect the mass air sensor and drive it to see if the hesitation is still there. If hesitation is gone then replace the mass air sensor and drive to see if hesitation has...
Question
Starter
Hi There, It sounds like you may have two possible issues. When the car dies as you put it into gear, this suggests you have a problem with what is called a MAP sensor. The Manifold Absolute Pressure (MAP) sensor...
Question
Serpentine belt snapped, replaced it and jumped the car it semi worked but then didnt. I changed my alternator but wont start
If you have what seems like a dead battery and when you try and jump start the vehicle and it still will not crank good enough to start the motor then you will need to have a voltage drop test...
Question
Water leaking in trunk fills a pool of water inside.
Hello. There are few things that could cause a water leak in the trunk on your particular vehicle. Which are, faults such as the trunk not fully closing due to a faulty trunk latch or the more common problem of...
Question
Vibration at 35 mph
Hi there. This is very odd, as typically when a mechanical component is damaged, the vibration or rattle will progressively increase as you accelerate. In most cases, a tire / wheel out of balance will cause this type of vibration,...
Question
How do I know if I need upper or lower control arm bushings for the front? 1999 Mercury Grand Marquis
Hi - worn, damaged or "soft" control arm bushings will usually make themselves known as "loose" steering, requires more frequent or constant "corrections" from the steering wheel, abnormal tire wear, or the inability to get the front suspension aligned properly....

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