Catalyst & Evap not ready, need help!
#1
Catalyst & Evap not ready, need help!
So I can't seem to get my truck to pass emissions due to the fact the catalyst and evap systems come up as not ready.
My truck is a 2004 that originally came with a 4.8L but now has a 6.0L. I also have aftermarket cats which I put on over a year ago. I haven't had any DTC's since I changend the cats so I don't think they are causing any problems.
I have completed the GM drive cycle many times as per the recommendation but I still won't pass.
Any suggestions would be greatly appreciated.
My truck is a 2004 that originally came with a 4.8L but now has a 6.0L. I also have aftermarket cats which I put on over a year ago. I haven't had any DTC's since I changend the cats so I don't think they are causing any problems.
I have completed the GM drive cycle many times as per the recommendation but I still won't pass.
Any suggestions would be greatly appreciated.
#2
On The Tree
iTrader: (8)
Join Date: Jun 2005
Location: Austin, TX
Posts: 145
Likes: 0
Received 0 Likes
on
0 Posts
So I can't seem to get my truck to pass emissions due to the fact the catalyst and evap systems come up as not ready.
My truck is a 2004 that originally came with a 4.8L but now has a 6.0L. I also have aftermarket cats which I put on over a year ago. I haven't had any DTC's since I changend the cats so I don't think they are causing any problems.
I have completed the GM drive cycle many times as per the recommendation but I still won't pass.
Any suggestions would be greatly appreciated.
My truck is a 2004 that originally came with a 4.8L but now has a 6.0L. I also have aftermarket cats which I put on over a year ago. I haven't had any DTC's since I changend the cats so I don't think they are causing any problems.
I have completed the GM drive cycle many times as per the recommendation but I still won't pass.
Any suggestions would be greatly appreciated.
#3
I tune with CMR so I have access to those parameters. My question is what number do I put in nest to the OBD II tests that I need to modify?
#4
On The Tree
iTrader: (8)
Join Date: Jun 2005
Location: Austin, TX
Posts: 145
Likes: 0
Received 0 Likes
on
0 Posts
I am not sure what you are asking (numbers to put in next to OBDII tests?), but if you'll set the processing enablers for DTC P0420, P0430, P0440, P0442, P0443, P0446, P0449, and P1441 to "not reported" or "X", the EPA tests should all report as passed/completed.
#5
I found every code but P0440 and P1441.
Last edited by Turbo 6.0; 01-13-2009 at 12:00 AM.
#6
On The Tree
iTrader: (8)
Join Date: Jun 2005
Location: Austin, TX
Posts: 145
Likes: 0
Received 0 Likes
on
0 Posts
There are four conditions: not reported, non-emissions, emissions-related one trip failure, and emissions-related two trip failure. I would guess that the numbers 0-3 correspond in that order, or in the opposite order.
What do you have for those codes currently? If you can't tell, try all zeroes or all threes. If you have the ability to check the readiness tests before going in for inspection, the guess-and-check method isn't so bad.
#7
Sorry, I thought CMR might have been a shop or something you had access to. My mistake.
There are four conditions: not reported, non-emissions, emissions-related one trip failure, and emissions-related two trip failure. I would guess that the numbers 0-3 correspond in that order, or in the opposite order.
What do you have for those codes currently? If you can't tell, try all zeroes or all threes. If you have the ability to check the readiness tests before going in for inspection, the guess-and-check method isn't so bad.
There are four conditions: not reported, non-emissions, emissions-related one trip failure, and emissions-related two trip failure. I would guess that the numbers 0-3 correspond in that order, or in the opposite order.
What do you have for those codes currently? If you can't tell, try all zeroes or all threes. If you have the ability to check the readiness tests before going in for inspection, the guess-and-check method isn't so bad.
I will put a 3 in the codes you mentioned so that the code is not reported. All of those codes currently have a 1 so I assume it's a one trip faliure.
Trending Topics
#9
TECH Resident
iTrader: (17)
Join Date: Sep 2004
Location: NC - Charlotte area
Posts: 3,747
Likes: 0
Received 0 Likes
on
0 Posts
you will want 3 for EVERYTHING. MIL status, DTC... make sure you get EVERYTHING. I ran into this and had to find those stragglers that my eyes didn't catch the first time
#10
Thanks again to everyone that helped!
#12
Well I inserted a 3 into all of the codes pertaining to the EVAP and the rear O2 sensors and it passed emmissions!
Thanks again to everyone that helped. This is a big weight off my shoulders.
Thanks again to everyone that helped. This is a big weight off my shoulders.