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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

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Old 11-19-2012, 08:52 AM
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Aftermarket Cat question

I bought an aftermarket Thunderbolt Hi flow cat. My question is will I have any problems with not connecting the tube thats on the existing stock one. The stock ones rusted to high heavens so I have to replace it.
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1991 F250 SCLB Dual Tanks
5.8-351w
The Battle Wagon

And as if on cue, the clouds parted and the sun came out, I heard Morgan Freeman's voice "Remember the previous owner was a tool".
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Old 11-19-2012, 08:59 AM
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Aftermarket honeycomb cats don't need air injection to function correctly, and it's possible they may actually overheat and fail if you do connect it.
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1990 5.0HO AOD XLT X-Cab F150 3.55LS, 1994 3.0L 5-sp x-cab Ranger 3.45, 2004 3.0L 5-sp X-cab Ranger Edge 4.10, 2004 2.5L 5-spd Subaru Legacy
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Old 11-19-2012, 01:38 PM
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So what should i do with the tube from the stock one? Just cut and forget?
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1991 F250 SCLB Dual Tanks
5.8-351w
The Battle Wagon

And as if on cue, the clouds parted and the sun came out, I heard Morgan Freeman's voice "Remember the previous owner was a tool".
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Old 11-19-2012, 01:47 PM
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Theres two tubes going to the existing cat, is one a return or something? Also will it throw codes with out them hooked up?
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1991 F250 SCLB Dual Tanks
5.8-351w
The Battle Wagon

And as if on cue, the clouds parted and the sun came out, I heard Morgan Freeman's voice "Remember the previous owner was a tool".
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Old 11-19-2012, 09:35 PM
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Any one ?
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1991 F250 SCLB Dual Tanks
5.8-351w
The Battle Wagon

And as if on cue, the clouds parted and the sun came out, I heard Morgan Freeman's voice "Remember the previous owner was a tool".
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Old 11-19-2012, 09:42 PM
Nally427 Nally427 is offline
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ive come across this same thing before, on my 5.0 i ditched all the cats and went with longtube headers. i had just cut the pipe leading to the first converter and i havent had any problems since. no check engine light, no problems running. but maybe put some sort of plug in it. but like i said i cut mine and ive had no issues with it
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Old 11-19-2012, 09:52 PM
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Quote:
Originally Posted by Hutch17 View Post
Theres two tubes going to the existing cat
Do you have a HD truck(F250 or larger)? You won't have any problems(codes) with just disconnecting the tubes except that they may produce some noise when air is being pumped through them.
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Paul (Conan) O'Brien

1990 5.0HO AOD XLT X-Cab F150 3.55LS, 1994 3.0L 5-sp x-cab Ranger 3.45, 2004 3.0L 5-sp X-cab Ranger Edge 4.10, 2004 2.5L 5-spd Subaru Legacy
1996 Kawasaki ZX11D, 2004 Honda 599, 2008 Kawasaki KLR650
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Old 11-20-2012, 05:40 AM
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yea Its a 250 with the 351. Thanks for the help guys!
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1991 F250 SCLB Dual Tanks
5.8-351w
The Battle Wagon

And as if on cue, the clouds parted and the sun came out, I heard Morgan Freeman's voice "Remember the previous owner was a tool".
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  #9  
Old 11-21-2012, 09:28 AM
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Quote:
Originally Posted by Conanski View Post
Do you have a HD truck(F250 or larger)? You won't have any problems(codes) with just disconnecting the tubes except that they may produce some noise when air is being pumped through them.
Sorry to hijack, but I'm replacing my cat this winter on my HD >8600 '96 F250. Is there a difference with the cats on these models? It has a 5.8 A/T 4x4. Any good cat recommendations for it? Thanks in advance!
Roger
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Old 11-21-2012, 09:32 AM
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No difference except that the cats are usually high capacity.
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1990 5.0HO AOD XLT X-Cab F150 3.55LS, 1994 3.0L 5-sp x-cab Ranger 3.45, 2004 3.0L 5-sp X-cab Ranger Edge 4.10, 2004 2.5L 5-spd Subaru Legacy
1996 Kawasaki ZX11D, 2004 Honda 599, 2008 Kawasaki KLR650
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Old 11-21-2012, 02:15 PM
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My new cat got here today nice and shinny!
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1991 F250 SCLB Dual Tanks
5.8-351w
The Battle Wagon

And as if on cue, the clouds parted and the sun came out, I heard Morgan Freeman's voice "Remember the previous owner was a tool".
Reply With Quote
  #12  
Old 12-08-2012, 08:38 PM
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Hey guys I got my exhaust all hooked up a couple weeks ago. One problem, it sounds like there is an exhaust leak. I think there's a small one rights infront of the cat, that's no problem. I think the two air injection tubes are producing the exhaust leak noise. I doubt I'll pass emissions with it like that. How would you guys recommend plugging the air injection ports that the engine? Or could I get away with just leaving them disconnected?
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Old 12-11-2012, 06:53 AM
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Any one???
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1991 F250 SCLB Dual Tanks
5.8-351w
The Battle Wagon

And as if on cue, the clouds parted and the sun came out, I heard Morgan Freeman's voice "Remember the previous owner was a tool".
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  #14  
Old 12-11-2012, 10:26 AM
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The best solution would be to remove everything and plug the fittings in the heads. I know on the 4.9 this is done with 9/16-18 x 2.5" bolts. If you leave in place the related electrical controls and cap off any vacuum lines you should not get a CEL.

Whether or not you will pass emissions test is a function of what state/county you live in. Technically, by removing emissions equipment you *should* fail a visual inspection, but the enforcement of this law is highly variable and subjective.
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Old 12-11-2012, 11:57 AM
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On the 351 they're 5/8-11 thread. I used 1" long bolts to plug mine.
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Old 12-11-2012, 11:57 AM
 
 
 
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