failed emissions in az, NOX a bit high
#1
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Join Date: Apr 2003
Location: Phoenix, AZ, US OF A
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failed emissions in az, NOX a bit high
Need help with lowering my NOX, i failed for the second time.
my setup, 1990 dx with d15b swap, running obd1 (p08 ecu)
ran seafoam, tried octane booster and alcohol from home depot. dont know if the NEW 2 1/4 exhaust with new magnaflow cat has anything to do with it. using megan headers too.
before running seafoam, octane booster and alcohol
hc 0.39
co 7.79
nox 2.71
results after using seafoam and running with octane booster and alcohol
hc 0.32
co 2.69
nox 2.92
Applicable standard
hc 1.00
co 12.00
nox 2.50
Please HELP!
my setup, 1990 dx with d15b swap, running obd1 (p08 ecu)
ran seafoam, tried octane booster and alcohol from home depot. dont know if the NEW 2 1/4 exhaust with new magnaflow cat has anything to do with it. using megan headers too.
before running seafoam, octane booster and alcohol
hc 0.39
co 7.79
nox 2.71
results after using seafoam and running with octane booster and alcohol
hc 0.32
co 2.69
nox 2.92
Applicable standard
hc 1.00
co 12.00
nox 2.50
Please HELP!
#2
Re: failed emissions in az, NOX a bit high (alky350)
u dont want nox it is from ur engine running too hot so higher octanes would only worsen this, all i could think of is find some thing to find ur engine to run colder
#3
Re: failed emissions in az, NOX a bit high (alky350)
try retarding the timing.. say 5 degrees . i have a crx hf. i bumpt the timging a bit above normal. failed smog. i had done all the things you described plus new plugs, wires, distrib cap and roter, fuel and air filter, changed oil and filter, sea foam in fuel, sea foam sucked in thru vacuum. i was working on getting mpg up. took it to inspection, failed NOX. was suprised. went home, set timing at specs, went back and passed, results were the best in 4 of 5 years minimum (i keep the old inspection slips)s
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