1997 lean condition

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Killer Ride

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It's not a grand but not cheap found a local guy $ 650 installed all 4. It used to be more in 2011 for replacements had to be OEM 6-700$ each. Would have been $3,500. universals today cost $70-80 ea. Thank God they changed the rules.

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Killer Ride

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These are the original cats also depends how much mileage, and how its driven. This truck only has 166,000mi my F150 had 267,000 when I had to replace them. Luckily back then in 2011 I got some used ones for $50 each.

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TobyU

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I think the difference is when one is plugged vs when you are checking to see if one is working. A working one is hotter after do to the process taking place inside. If mostly clogged nothing gets through and the reaction taking place can't exit to show it increase in heat.
 

1955moose

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Here in the Bay area, decent quality cats are about $400.00 to $500.00 each. You can buy the cheap ones that last about 2-3 years for $200.00 to $300.00. Actually a catalytic converter will last the life of vehicle, avg 250-300k. But this only happens when fuel entering is clean and lean. They just go bonkers when raw unburned fuel enters them on a regular basis. You'd think after all these years 1975- present, they'd make one that held up better. But why, when they can sell you a new one. It's like getting caught in an Hov lane by yourself, it ain't cheap.


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crowncrazy87

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Ok. Well pulled some live data this evening and here is what I got...

SHRTFT1- 1.6% (would go from -4ish to 8l
LONGTFT1- 3.1% (this would vary some but no more than a few numbers)

SHRTFT2- 10.2% (varied widely both positive & negative.
LONGTFT2- 24.4% (varied widely )

SHRTFTB1S1- 3.1%
SHRTFTB1S2- N/A

SHRTFTB2S1- 15.1
SHRTFTB2S2- 99.2
 

1955moose

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Your #2 is your problem. Check those cats, probably gone. So no smoke coming from intake anywhere? And also replace those 2, 02 sensors with Ford or Motorcraft ones. You found your problem. Now the fix. You obviously had/have a bad misfire that caused this.

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crowncrazy87

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Well I bought the rig on Monday from a lady who said it just lost power while driving and it wouldn't hardly go 10mph. I originally found 2 fouled plugs fixed that. That's probably what got to the cats. I'll look into checking the cats on that side and see what I come up with.
 

1955moose

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Best way is the screw in back pressure gauge. Why did those 2 plugs foul? Be sure those 2 injectors aren't leaking, and that both those coils are sound and sparking. Your problem sounds like a plugged cat. Were the 2 fouled plugs right next to each other, if so do a compression test of those 2. A leaky head gasket can cause a drop of 2 side by side cylinders.

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crowncrazy87

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Opposite banks on the fouled plugs. Not sure the exact cause of it but or how long it had been that way. Once I replaced plugs and wires misfire code has not shown back up. Just the lean codes.
 
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