My car is consistantly running 15% rich during my emissions testing which is causing me to fail HC and the NOX. The car is completely stock. Its a 1989 Honda Civic Hatchback. It has the 1.5L STD engine and the dual point fuel injection. My car is throwing no codes but there's a slight hesitation upon acceleration. (ex. i'm at ilde, car in neutral and i stab the gas, it'll stutter from the idle and then start reving up) What could be the problem? Thanks in advance for any info you can give me.

P.S. Is there a way to adjust the fuel ratio??


[Modified by Civic89, 11:23 PM 9/19/2002]

 

no one has any ideas????

 

Usually when it comes to emissions you want to start off with the basics.

First replace your wires, cap & rotor and throw in some new NGK plugs (don't use other platinum tip p.o.s's, use the Honda recommended kind)

If that is already good, then it might be that your timing is off.

Replacing the fuel filter wouldn't hurt I guess... Last but not least, clean out your fuel system! Buy a nice complete fuel system cleaner (not just the injector cleaner) and pour it in your gas tank while your at the gas station, then completely fill it up. Take a nice long drive on the freeway or something, use up the entire tank!

Also, use a good quality (chevron) 85 octane gas, or the lowest that you can get.
Understand that higher octane fuels are only more detonation resistant than lower octane fuels - one could argue that a lower octane is more explosive, and you'd have less of a chance having unburned fuel after it leaves the combustion chamber.

Can't really think of anything else, so good luck!

 

I could drive to florida and back to ohio on a full tank of gas! (sarcasm)

Run it hard, go on the highway late at night where there is no one, and just gun it past 100 to help unclog your injectors.

 

Replace O2 sensor.

 

replace your catalyic converter if all else fails

Blaze

 

Measure voltage output on the O2 sensor (lambda) , it should read around 0,85V

 

I replaced the O2 sensor but it only helped a little bit. Still failing. The guy at the emissions station said that the cat was doing it's job by the look of the readings. But it looks like it could be the stock cat and with 175k on it i'm sure it could be doing it's job a little better if it was new. I'm begining to think that's the only way to go is to replace the cat.

Anything else I could do??

 

thats rich as ****
wot i hit .768
.5-.6 crusing (voltage sweep)

however its stock so .8 could be right


[Modified by TorteX, 12:57 PM 9/20/2002]

 

Mmm I took it of a graph provieded by a tuningshop

 

If my timing is off, would it be retarded or advanced to cause the rich condition? Thanks.