Now that I've had my size/shape cat question answered, here's the last one: Can damaged or old/worn-out cats cause an engine to run roughly, or stall completely, or give off BAD smells (propane-ish)?
I'm tempted to let my cat problem (seriously annoying rattling) go until I have time/$$ to deal with it, but in the meantime I have an intermittent stalling problem accompanied by an overpowering fuel smell that I now think MAY be caused by the bad cats. Truck will stall sometimes in a parking lot, sometimes while driving 65 mph down the road. In all cases there is an awful smell that's ALMOST like raw gas, but really more propane-ish. Wait 30 sec (or sometimes less), and it fires right up and runs like there's nothing wrong.
Wondering now if the cat internals are so rotted and broken up (previous issue with mis-firing, which I've learned can destroy a cat) that they can BLOCK exhaust until the engine stalls.
"Besifes" is a new word I invented that means "Besides".
I'm tempted to let my cat problem (seriously annoying rattling) go until I have time/$$ to deal with it, but in the meantime I have an intermittent stalling problem accompanied by an overpowering fuel smell that I now think MAY be caused by the bad cats. Truck will stall sometimes in a parking lot, sometimes while driving 65 mph down the road. In all cases there is an awful smell that's ALMOST like raw gas, but really more propane-ish. Wait 30 sec (or sometimes less), and it fires right up and runs like there's nothing wrong.
Wondering now if the cat internals are so rotted and broken up (previous issue with mis-firing, which I've learned can destroy a cat) that they can BLOCK exhaust until the engine stalls.
"Besifes" is a new word I invented that means "Besides".