i need help getting my 90 4 runner to pass emissions?its only high in carbon monoxide


here is the results
hc 1.70 allowed(2.0)
co 60.78 allowed(20.00)
nox 3.60 allowed (4.00)

i have seafoamed it in the tank
it has a lifter or valve tick ...
no idea how to fix its my first yota
it have claimed by previous owner
new plugs ,wires,injectors,and last time it went thru it passed no prob in 08'

it has brand new exhaust from headers back cat is 2 weeks old andf it dont leak oil

 

i need help getting my 90 4 runner to pass emissions?its only high in carbon monoxide


here is the results
hc 1.70 allowed(2.0)
co 60.78 allowed(20.00)
nox 3.60 allowed (4.00)

i have sea foamed it in the tank
not sure if i should seafoam the engine thru the bb cause what if that carbon is sealing things lol?
it has a lifter or valve tick ...its kinda loud but i hear this is normal?!
no idea how to fix its my first yota
it have claimed by previous owner
new plugs ,wires,injectors,and last time it went thru it passed no prob in 08'

it has brand new exhaust from headers back cat is 2 weeks old andf it dont leak oil

 

Sounds like it is running too rich, is the air filter new? How old is the O2 sensor?
- http://board.marlincrawler.com/index.php?topic=1119.0

 

sry this is my girlfriend fb but yeah um the whole system is brand new but i am not positive about the o2 ......but cat muffler and piping are all brand new from previous owner but if o2 sensor was bad would i not get a check engine light ...sry its my first yota!
and tomorrow i am gonna clean my t/b and maybe swap out the tps sensor i acquired and the air filter is brand new

 

O2 sensors age for a long time where they read inaccurately before they ultimately fail. When they fail they will set a CEL code, but before that, they may not.