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Generations 8-9 1987-1996 F150 + 1987-1997 F250, F350

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  #1  
Old 11-11-2018, 10:51 AM
PaulKersey PaulKersey is offline
 
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Hollow cat performance issue

I know it's illegal, but my 1989 F-250 arrived with a hollow cat. I installed a re-manned 460, and still lacked the power it should have. I was also stalling occasionally from a dead stop. I pulled the old O2 sensor and immediately picked up power and cured stall issue, so I replaced it. Old 02 sensor I think always showed a rich mix and leaned out the engine. I still feel there's more power to gain. Could the hollow cat be responsible due to lower back pressure or another reason?
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Old 11-11-2018, 12:29 PM
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If the exhaust is to free flowing, you will lose some power on bottom end.
Keep all the factory sensors and go with a quality cat back exhaust for the best in performance and mileage.
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Old 11-11-2018, 05:12 PM
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I don't know that having a cat or not would make a noticeable enough difference in power... what makes you say it's lacking power?
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Old 11-11-2018, 09:00 PM
PaulKersey PaulKersey is offline
 
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I also have an '87 F-250 with a 460, and there is a significant difference between the two. Are you suggesting that a deleted cat has no effect on o2 sensor readings or air flow?
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Old 11-11-2018, 09:03 PM
PaulKersey PaulKersey is offline
 
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that makes sense. I'll first attempt to restrict air flow through the hollowed cat and see if that helps. If not, I may go ahead and replace it. Thanks.
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Old 11-12-2018, 09:00 AM
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Power difference could be rear gearing.

Cat shouldn't matter, but if there is a fuel problem that caused the cat to fail, and the previous owner to gut it, you should fix the problem.
Have you pulled the codes yet?
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Old 11-12-2018, 09:01 AM
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replacing the cat without fixing the fuel problem will cause the new cat to fail
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Old 11-12-2018, 12:35 PM
PaulKersey PaulKersey is offline
 
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Any previous issues were resolved with the new engine, and there are no codes. When I deleted the o2 sensor of course I got a code for that. The power issue I believe has to do with air/fuel mixture. I think the decreased back pressure is causing a lean fuel situation. I'll know soon
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