Have you changed the air filter too?
I have a 2001 marquis and there is no filter; contact your dealer to verify via vin number that you have one or not......
For a 1999 Mercury Grand Marquis : ( the engine air filter is Motorcraft FA-1668 )
99 G/M has no filter.
That car doesn't have a cabin filter.
The cabin air filter, in your 2004 Mercury grand Marquis, is located behind the dashboard on the passenger side. The air filter is directly behind the glove compartment.
I would say ( No ) I was looking at the 2002 Mercury Grand Marquis Owner Guide and it doesn't show any reference to a cabin air filter
If there is a PVC valve and hose and filter connected to the air intake, oil could be sucked up from the valve covers when the throttle is applied. perhaps the PVC valve needs to be changed.
driver side of motor in middle
According to the 1999 Mercury Grand Marquis Owner Guide ( and one of Ford's websites ) ( Motorcraft FL-820-S , engine oil filter )
It has a permanent filter that is changed when you have the fluid changed.
The fuel filter for your 2000 Mercury Grand Marquis is located under the car next to the rear left wheel, just pull off the hoses on each end of the filter and be sure that you have the right hose to the inlet of the new filter put on right.
According to the 2005 Mercury Grand Marquis Owner Guide ( and one of Fords websites ) The ( Motorcraft FL-820-S engine oil filter is used )
onan marquis 5500 generator
This could possibly be a fuel problem. Has the fuel filter been changed ? Fuel pressure checked ? Is there dirt in the fuel tank ?
69 Litres. I would assume.
motorcraft 820 S
it is right next to the air filter
According to the 1998 Mercury Grand Marquis Owner Guide ( and one of Fords websites ) The ( Motorcraft FL-820-S ) engine oil filter is used
The 1997 Mercury Grand Marquis owners manual shows : ( Motorcraft FL-820S ) and fordparts.com shows : ( Motorcraft FL-820 ) for the engine oil filter
on my 96 grand marquis its on the driver side uder the car right below the back door
fuel filter is on the frame under rear door on passanger side.