If I was getting enough raw fuel to kill the cat in 7,000 miles wouldnt it kick out another code and get poor fuel milage. I checked milage on the last tank and it had gotten 32 MPG.
Not nessisarilly, depends on the cause of the rich mixture.
a small vacuum leak ( intake gasket ) will cause a lean condition that the O2 sensor with pick up and adjust the mix according (rich) this could be just enough to burn out the cat. it may not set a code until it's too late.
Do you have means to check engine data while it is running /driving ?
Check coolant temp, (190*-210*) if thermostat is hung open, it will not warm up properly and stay in open loop, causing a rich condition. again, something PCM will not detect as abnormal. ( newer vehicles after 2002 detect this and will throw a code for low coolant temp, just for this reason), DO NOT trust the dash gauge for this, they are refferance at best, not accurate at all.
greg slade The first 2 were part # 75014 the one they just put on was 2505R. They were all International Muffler Co. brand. I changed the plugs + wires right after the first cat was put on so its been about 25,000 and I used the AC Delco plugs+ wires. The o2 sensors were changed by me when the #2cat went bad. They were Bosh.
Slade is your man on Cats, can't help ya here.
Blkvoodoo I have not had to add an coolant at all. I have not preasure checked it but I havent had to add any coolant. Maybe I'll put the tester on it this weekend just for the heck of it.
it may not be loosing a noticable amount, was something to check. Antifreeze is pretty rough on a cat.
My work van (5.4L Triton, 227K ) is loosing coolant slowly, is very characteristic for 4.6 and 5.4L Fords to loose head gaskets and eat the converter around this mileage, just a waiting game now. Hope to be in a new van soon so I don't have to deal with it.
00bowtie I have never had to add any oil betwen changes.[/QUOTE]
) Maybe your FI is not working properly.
