Emissions?

[94civichatch]

Just took my car thur emission today. Man I did I fail. Anyways here are my results any pointers will help.

Gas Cap test: Pass
Pressure test: Fail
Evap Compoents-Hoses: Fail
My vechicle Applicaple Standard
Hydrocarbons (HC) in Grams/Mile 3.40 1.00 Fail
Carbon Monoxide (CO) in Grams/Mile 110.75 12.00 Fail
Oxides of nitrogen (NOX) in Grams/Mile 0.24 2.50 Pass

In a 1990 civichatch dx im running a d15bz1 motor with a ex manifold on a vx ECU

[90civicsi]

wow nice co! hows your gas milage? check your filler neck on your gas tank. witch one did you go to cuz that co is nutz

[allbossbra]

the only thing i can pass is nox

[YewllowDA]

well here are some facts:

your running rich( your combustion temperature is cool and thats why your nox is ok

if you decrease HC and CO( or increasing the combustion temp, LEAN), the Nox will increase ( this is the product of high combustion temperatures). and vice versa.


for some reason you are running VERY rich. could be the cause of a dead catalytic converter and other things

[Lazieb29]

could also be a bad coolant temp sensor thats causing you to run rich. Engines are programed to run rich when the engine is cold. But then again it can be lots of things... theres a fuel treatment called GUARANTEED TO PASS EMISSIONS by cnc... lots of people say this actually works

[91da6]

replace the catalytic converter bro . and you will pass.

[ILIKETODRIVE]

His cat is fine.

If you pass NOx that easily, your cat is working.

What's a d15bz1? You mean OBD-1 D15Z1 from 92-95 VX's? You're running a VX ECU so I assume you're OBD-1 converted. The EX IM is A LOT bigger than the VX IM. What header/exhaust do you have? Recently changed plugs/wires/cap/rotor/fuel filter/air filter? If not, change 'em.

[90civicsi]

His cat is fine.

If you pass NOx that easily, your cat is working.


x2

[2poor2tune]

hahaha just depin one of the wires at the resistor clip. or 2 in you need to. thats what i did. and they will never know you pulled an injector clip. or do it the right way. up to you.

[YewllowDA]

changing the timing would help...adjusting the distributor etc.
retard the timing?

[2poor2tune]

hu i wish i could help here. i have heard the same about the dizzy timing. but is it retard or advance. i have heard both. but i would go towards retard

[YewllowDA]

ive heard
....one car was so "retarded" that it couldn't get off the rollers lol.
retarding did help the car pass emmisions but yeah no power. just play w/ the timing.
access to emission testers would be nice also......