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From what you describe your catalytic convertor is going bad. Pretty soon, if you haven't already, you will experience a significant loss of power. There is no easy solution. It will have to be replaced. No reputable muffler shop will just cut it out because it is illiegal to run without one. Sorry about the bad news.
What else can I help you with?
How do you change gear oil in a 1998 expedition?
How do you change gear oil in a 1998 expedition?"
How do you replace a Heater Core in a 1998 expedition?
How do you replace a heater core in a 1998 Ford Expedition?"
What oil for a 1998 expedition?
The 1998 Ford Expedition owners manual shows ( 5W-30 )
Where is the power window fuse 1998 Ford Expedition?
where is the power window relay 1998 ford expedition
How do you replace a heater core in a 1998 Ford Expedition?
How do you replace a heater core in a 1998 ford expedition?"
Rear axel removal on 1998 Ford Expedition?
how do you remove the right rear axle on a 1998 ford expedition?
What type of oil to use in 1998 Ford Expedition?
The 1998 Ford Expedition Owner Guide shows ( 5W-30 )
Where is the cabin filter on 1998 Ford Expedition?
The Owner Guide doesn't show a cabin filter for the 1998 Ford Expedition
Do parts from a 1996 Ford Expedition fit a 1998 model?
There is no 96 Expedition. The first year for the Expedition was 1997.
How do you depressurize fuel system to install filter 1998 ford expedition?
How do you depressurize fuel system to install filter 1998 ford expedition?
What type of freon for 1998 expedition?
R134a
How do you know the fuel pump is going bad in a 1998 expedition?
how do i know the fuel pump is going bad in a 1998 ford expedition eddie bauer?
