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Old 02-19-2018, 12:29 PM   #1
Skoolie
 
Join Date: Jan 2018
Location: Colorado
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Year: 1995
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CCRT Diesel particulate filter on a 2000

I saw an auction bus that was listed as a 2000 with a 5.9 cummings, and that it had a CCRT Diesel particulate filter installed (specifically called out).

I thought at least federally that particulate filters weren't required that early. (this one was in Oregon).

So is this an aftermarket add on kind of particulate filter? Or is it tied into the ECU like alot of the modern ones are (I believe that the regen cycle causes the engine to run rich to raise exhaust temp and burn out the particulate).

I'm thinking if a previous owner had added a catalytic converter to a classic car and it wasn't required, you could legally remove it, and the car wouldn't care. With some of these systems, they weren't required at the time so I would assume they could be removed, but if its tied into the ECU I imagine it would throw an error or would simply run the regen cycle occasionally and freak me out because exhaust temp would rise.

Anyway, thought I would check with the group to see if anyone had run across these before. Should they just be treated the same as a 2004+ bus that has extra emissions gear, and just realize if you buy it, you are going to have to live with it?
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Old 02-19-2018, 01:21 PM   #2
Bus Geek
 
Join Date: Sep 2017
Location: Owasso, OK
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Quote:
Originally Posted by Tigerman67 View Post
I saw an auction bus that was listed as a 2000 with a 5.9 cummings, and that it had a CCRT Diesel particulate filter installed (specifically called out).

I thought at least federally that particulate filters weren't required that early. (this one was in Oregon).

So is this an aftermarket add on kind of particulate filter? Or is it tied into the ECU like alot of the modern ones are (I believe that the regen cycle causes the engine to run rich to raise exhaust temp and burn out the particulate).

I'm thinking if a previous owner had added a catalytic converter to a classic car and it wasn't required, you could legally remove it, and the car wouldn't care. With some of these systems, they weren't required at the time so I would assume they could be removed, but if its tied into the ECU I imagine it would throw an error or would simply run the regen cycle occasionally and freak me out because exhaust temp would rise.

Anyway, thought I would check with the group to see if anyone had run across these before. Should they just be treated the same as a 2004+ bus that has extra emissions gear, and just realize if you buy it, you are going to have to live with it?
California retro-fitted a lot of buses with DPFs, to continue to use them. They couldn't do it with the mechanical engines, but they can with some ECUs.

It might be possible to delete it, but I don't know what other changes need to be made. If the filter is working as it should, it ought to be more reliable than they are in school bus service. Replacing them is horribly expensive.
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Old 02-19-2018, 03:41 PM   #3
Bus Nut
 
Join Date: Feb 2015
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You can take it off, school bus operators got federal subsidies to put those on, not hooked to the ECU
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