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Does your 5.4 destroy catalytic converters?

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Old 02-27-2017, 06:22 PM
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Default Does your 5.4 destroy catalytic converters?
Just replaced my passenger's side cat. the truck only has 106k miles. It let go violently and caused a p0303 and p0420. $210 bucks later, the problem is solved. Is this a common Ford issue? Should I replace the driver's side soon too?


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Old 02-27-2017, 06:26 PM
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You should always replace them in pairs.
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Old 02-27-2017, 08:20 PM
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Originally Posted by 4.6owner
You should always replace them in pairs.
Umm, no, why would you think that?

OP

For the most part a bad cat is a symptom of an upstream issue, namely a rich fuel condition usually from a miss. This is why it is important to take care of a miss ASAP.

Unburnt fuel get into the can, causing excessive heat and melting.
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Old 02-27-2017, 08:44 PM
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On my originals @ 156K now. I run my Gryphon settings of timing +1.5 and WOT fuel @ +1.75 on 91 octane. No converter issues.
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Old 02-27-2017, 08:53 PM
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145k on my '07. Factory cats are still good.
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Old 02-27-2017, 09:07 PM
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Still factory at 155K. If they ever go, my plan is to just gut em and keep on rolling. Down here in MS we don't worry about that kind of stuff, we like being last in everything!
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Old 02-28-2017, 06:33 AM
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The 5.4 3V only destroys cats if not kept properly tuned-up.
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Old 02-28-2017, 07:49 AM
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My 08 has 155k and no issue with cats
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Old 02-28-2017, 07:50 AM
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195k on factory cats
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Old 02-28-2017, 09:00 AM
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127k on an 04. Previous owner put cats on, didn't know when I bought it
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