I have a 97 F150 4x4 with the 4.6L. I have almost 90k on it and I am smelling eggs going up hills. I happen to live in a county that does not have emmisions testing for inspection. Do the cats sound like they are bad? I knew I saw 2 but 4?? Do they really make a better flowing cat that will not screw anything up?

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1997 F-150
Ext Cab
4x4 w/offroad pkg
towing pkg
4.6L with Auto Trans

 

It's your gas. Find a station where the sulphur content is lower. They don't usually post the information, so just try different stations until the smell goes away.

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Model: '99 F150 Lariat Supercab 4x4 SS Mechs: 5.4L, 3.73 Diff (9.75" LSD Rear, 8.8" Front)
ORP: Skid Plates, LT265/70R17 GY Wrang. AT/S
Group III towing: HD Electrical/Cooling, GVWR 6500# (Extra leaf spring).
Stuff: Step Bars, 4W Disc ABS, K&N filter, 0W-30 Series 2k Amsoil @ 8200 miles, Herculiner
Stock Items That Differ Across F150s: Steel Driveshaft, Oil filter bolted to engine w/ drip guard, 4R70W transmission.

 

I was going to say give your cat a bath and then realized what you were talking about.

 

Very funny Snow!hehehe

 

Of course your cat stinks.. it's a cat!
A good dog will take care of your problem.

-IKE