JHZR2
Staff member
First off, thanks to all who have helped me on here trying to figure out my NOx problem.
Its amazing what an OE cat converter can do for your emissions. An aftermarket converter, day one, is abot as good as a 100k mile OE unit - seriously. And Im not talking about today's improved heterogeneous catalysis, no. Im talking about 1991 technology.
So, my previous failure with my Dinan (CARB approved) chip was:
NOx: 2126 (standard = 1134)
HC: 161 (standard = 146)
CO%: 0.54 (standard = 0.82)
CO2%: 14.1
O2%: 0.5
After this gross failure, I took out the dinan chip, and things got worse, up to 2700 ppm NOx.
I checked madly for intake leaks, thought about lean misfires, etc... No dice. Some said that my chip was making the car run with poor emissions, though I knew from the past (I had been borderline failing, around 1150 ppm NOx, since 2003) that this wasnt the case. When I put in the aftermarket cat, my numbers didnt even budge from those that were on my OE cat that had 100k on it.
Well... (drum roll)... $1200 later, and after a new, OE, BMW cat, freshly imported... my numbers are now:
NOx: 49
HC: 3
CO%: 0.00
CO2%: 15.0
O2%: 0.0
Thanks all for the help and assistance, as well as helping me to stay sane while troubleshooting what was a perfectly operating automobile...
Fortunately Ill not have to worry about emissions for a LONG time now!!!!
Best regards,
JMH
Its amazing what an OE cat converter can do for your emissions. An aftermarket converter, day one, is abot as good as a 100k mile OE unit - seriously. And Im not talking about today's improved heterogeneous catalysis, no. Im talking about 1991 technology.
So, my previous failure with my Dinan (CARB approved) chip was:
NOx: 2126 (standard = 1134)
HC: 161 (standard = 146)
CO%: 0.54 (standard = 0.82)
CO2%: 14.1
O2%: 0.5
After this gross failure, I took out the dinan chip, and things got worse, up to 2700 ppm NOx.
I checked madly for intake leaks, thought about lean misfires, etc... No dice. Some said that my chip was making the car run with poor emissions, though I knew from the past (I had been borderline failing, around 1150 ppm NOx, since 2003) that this wasnt the case. When I put in the aftermarket cat, my numbers didnt even budge from those that were on my OE cat that had 100k on it.
Well... (drum roll)... $1200 later, and after a new, OE, BMW cat, freshly imported... my numbers are now:
NOx: 49
HC: 3
CO%: 0.00
CO2%: 15.0
O2%: 0.0
Thanks all for the help and assistance, as well as helping me to stay sane while troubleshooting what was a perfectly operating automobile...
Fortunately Ill not have to worry about emissions for a LONG time now!!!!
Best regards,
JMH