Where is the Catalytic converter at on the 7.3? - Diesel Forum - TheDieselStop.com
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Upgrades and Aftermarket - 99 & up 7.3L Engine Upgrading or adding OEM or aftermarket equipment to your 1999-Up Super Duty or Excursion with 7.3L Power Stroke diesel engine. Please confine discussion of topics in this forum to those items that are specific to the 7.3L Power Stroke engine.

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Old 09-25-2006, 09:19 AM   #1 (permalink)
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Where is the Catalytic converter at on the 7.3?

I can't see one anywhere from where the exhaust enters the turbo, all the way back through the muffler and to the end of the pipe????? [img]/ubbthreads/images/graemlins/confused.gif[/img]
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Old 09-25-2006, 09:23 AM   #2 (permalink)
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Re: Where is the Catalytic converter at on the 7.3?

If your truck has an automatic tranny it wont have a catalytic converter.
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Old 09-25-2006, 09:38 AM   #3 (permalink)
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Re: Where is the Catalytic converter at on the 7.3?

[ QUOTE ]
If your truck has am automatic tranny it wont have a catalytic converter.

[/ QUOTE ]

I guess that would explain why I can't find one....thanks! Is this the same with the 6.0 PSD as well? Automatic=no Catalytic converter?
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Old 09-25-2006, 09:43 AM   #4 (permalink)
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Re: Where is the Catalytic converter at on the 7.3?

Nope, all 6.0's come with a cat.

I've heard though that how long it actually stays on varies. [img]/ubbthreads/images/graemlins/grin.gif[/img]
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Old 09-25-2006, 09:44 AM   #5 (permalink)
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Re: Where is the Catalytic converter at on the 7.3?

[ QUOTE ]
Nope, all 6.0's come with a cat.

I've heard though that how long it actually stays on varies. [img]/ubbthreads/images/graemlins/grin.gif[/img]

[/ QUOTE ]

LMAO, seems like I've heard somthing like that myself. [img]/ubbthreads/images/graemlins/biggrin.gif[/img] Thanks!
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Old 09-25-2006, 12:19 PM   #6 (permalink)
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Re: Where is the Catalytic converter at on the 7.3?

[ QUOTE ]
If your truck has am automatic tranny it wont have a catalytic converter.

[/ QUOTE ]

I guess that depends on where you bought the truck. My 99.5 F350 never had a c/c.
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Old 09-25-2006, 12:27 PM   #7 (permalink)
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Re: Where is the Catalytic converter at on the 7.3?

[ QUOTE ]
[ QUOTE ]
If your truck has am automatic tranny it wont have a catalytic converter.

[/ QUOTE ]

I guess that depends on where you bought the truck. My 99.5 F350 never had a c/c.

[/ QUOTE ]

I think it's more when as opposed to where.

Smokeywren on here has the lowdown and has posted before the dates manufactured and which ones do and don't have cats. Like I said, all I'm sure of is autos don't have them.
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Old 09-25-2006, 01:28 PM   #8 (permalink)
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Re: Where is the Catalytic converter at on the 7.3?

Why is that that the autos don't but he handshakers do? Didn't the OBS trucks have cats or am I just way off? Let me know.
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Old 09-25-2006, 01:42 PM   #9 (permalink)
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Re: Where is the Catalytic converter at on the 7.3?

[ QUOTE ]
Why is that that the autos don't but he handshakers do? Didn't the OBS trucks have cats or am I just way off? Let me know.

[/ QUOTE ]

The 2001 and later manuals had higher horsepower rating and thusly they had higher emissions to deal with.

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Old 09-25-2006, 06:36 PM   #10 (permalink)
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Re: Where is the Catalytic converter at on the 7.3?

[ QUOTE ]
Why is that that the autos don't but he handshakers do? Didn't the OBS trucks have cats or am I just way off? Let me know.
--------------------

[/ QUOTE ]
Ok,, my early 99 had a cat,,, some of the autos had them, handshakers dont, and sometime or another they didnt put them on the 7.3 at all, (My 03 dually 7.3L didnt have one stock,,,

Like mentioned above, Smokey had the lowdown,, and there really doesnt seem to be any rhyme or reason to it,,
[ QUOTE ]

The 2001 and later manuals had higher horsepower rating and thusly they had higher emissions to deal with.

[/ QUOTE ] Not even sure if that is the case or not,, is it? Because my 03 7.3 was rated at the same 250 as the handshakers ,, right?
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Old 09-26-2006, 10:59 AM   #11 (permalink)
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Re: Where is the Catalytic converter at on the 7.3?

[ QUOTE ]
Why is that that the autos don't but he handshakers do? Didn't the OBS trucks have cats or am I just way off? Let me know.

[/ QUOTE ]
The 94 to 97 PSD did have cats. But reportedly some of the Canadian models did not? Also any forest service or offroad business trucks may have been delivered without a cat too.

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Old 09-26-2006, 02:20 PM   #12 (permalink)
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Re: Where is the Catalytic converter at on the 7.3?

[ QUOTE ]
Why is that that the autos don't but he handshakers do?

[/ QUOTE ]

You can lug a 6spd, the auto won't let you so they have lower emissions. The autos that have them are most likely CAL emission trucks.
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Old 09-26-2006, 02:21 PM   #13 (permalink)
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Re: Where is the Catalytic converter at on the 7.3?

Huh?
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Old 09-26-2006, 02:24 PM   #14 (permalink)
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Re: Where is the Catalytic converter at on the 7.3?

[ QUOTE ]
Huh?

[/ QUOTE ]

Autos won't allow you to lug them down (they downshift) which keeps the rpms up which equals more complete burning and lower emissions. The sticks have converters to deal with the excessive smoke/emissions from people short shifting or lugging them down on hills.
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Old 09-26-2006, 02:25 PM   #15 (permalink)
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Re: Where is the Catalytic converter at on the 7.3?

I was thinking it was the higher output of the manuals made them have higher NOX emissions.
Nox isn't usually measured while lugging is it?

Could be combo of both I guess
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