monopoly19
New Member
So here is a bit of backlog on the truck.
2005 QC
Known mods
Bellanger Headers
High flow cats
Custom 3" exhaust
CAI
I bought this truck from a private party in Nevada. He said it passed Nevada emissions without issue. I get it home to Colorado, and fail badly. Below are the numbers on what the first test was;
HC GPM: Reading - 2.64 Limit - 1.20
NOx GPM: Reading - 4.33 Limit - 2.00
CO GPM: VERY close on this one as well. Limit is 15.0 and I was 14.5
It was proposed and I also thought that maybe the truck had a tune on it I did not know about. So, I purchased an SCT tuner from Torrie with a stock tune on it. I install the tune, put in some 85 octane to get a hotter burn, went out and drove the piss out of the truck to get it hot and went for a re-test. The results are below....
HC GPM: Reading - 2.72 Limit 1.20
NOx GMP: Reading - 4.61 Limit 2.0
CO GPM: Reading 17.33 Limit 15.0
So, now I'm lost. The only thing I can think that's causing this is the high flow cats. The oil is a bit old, right at 3,000 miles so I can change that but I don't think it's going to make a major change.
On a previous vehicle I had to dump in half a gallon of denatured alky into 10 gallons of gas and it passed. I wanted to see if anyone else had thoughts or ideas on what I could do to try and lower the numbers. Thanks for your help!
2005 QC
Known mods
Bellanger Headers
High flow cats
Custom 3" exhaust
CAI
I bought this truck from a private party in Nevada. He said it passed Nevada emissions without issue. I get it home to Colorado, and fail badly. Below are the numbers on what the first test was;
HC GPM: Reading - 2.64 Limit - 1.20
NOx GPM: Reading - 4.33 Limit - 2.00
CO GPM: VERY close on this one as well. Limit is 15.0 and I was 14.5
It was proposed and I also thought that maybe the truck had a tune on it I did not know about. So, I purchased an SCT tuner from Torrie with a stock tune on it. I install the tune, put in some 85 octane to get a hotter burn, went out and drove the piss out of the truck to get it hot and went for a re-test. The results are below....
HC GPM: Reading - 2.72 Limit 1.20
NOx GMP: Reading - 4.61 Limit 2.0
CO GPM: Reading 17.33 Limit 15.0
So, now I'm lost. The only thing I can think that's causing this is the high flow cats. The oil is a bit old, right at 3,000 miles so I can change that but I don't think it's going to make a major change.
On a previous vehicle I had to dump in half a gallon of denatured alky into 10 gallons of gas and it passed. I wanted to see if anyone else had thoughts or ideas on what I could do to try and lower the numbers. Thanks for your help!