I have a hollowed out stock cat converter on my car and I was told my car is running too rich. (its reading too much air?) is there a way i can tone it down?

its starting to melt my rear lip and making my bumpers yellow.

 

get it tuned.

 

is there any cheaper alternatives?

 

Yeah maintence. If your melting your bumper, you are running lean, not rich.

Big diffrence. Start by having your 02 sensor replaced and your fuel injectors tested and cleaned.

 

I'd trade with him any day... Been running rich for months. Changed everything... finally gave up and bought the H22, haha. That gas guzzling H23 can go f**k itself!

 

lol.... you obviously didn't change EVERYTHING..... I got 33-34 highway mpg with my H23.. before it went VTEC.. now it's more like 30 highway

 

i had someone look at the car and they told me that its reading too much air. I have a stock cat converter gutted out. They told me that there is a plug that'll eliminate cel and read the air flow differently?

Basically he told me the car is reading too much air, so it's giving more gas

 

To much air=Lean

To much Gas=Rich

You want neither

If your o2 is reading 2 much air than you need to increase gas. Your injectors are what shot gas into the chamber. Start there.

 

Just put an oem or high flow converter on

 

your understanding of things seem to be very skewed.

when an o2 sensor reads an increase in air (leaner) it will try and correct this by adding an additional amount of fuel. But the stock o2 sensors have a very small range in which they can only give small amounts of fuel. Stock o2 sensors have a target air/fuel ratio of 14.7:1 and will add/remove fuel in small amounts to achieve this target.

If your muffler is melting your exhaust, then A) your muffler is too close to the bumper or B) your exhaust gas temperatures are too hot from running lean. When you run lean, the combustion chamber runs very hot. Adding fuel is a way to keep combustion temperatures to optimal areas.

get the code. Fueling depends on which code your ecu is throwing. If it is for the 2nd o2 sensor. It should not effect your fueling. All this sensor does is detect catalyst efficiency. When you get this code, it is possible that the ecu triggers some kind of base coding which tells it to add more/less fuel..etc. If you are getting a code for the 1st o2 sensor (primary), then the o2 sensor is not working properly. This o2 sensor is used to let the ecu know how efficient the engine is at fueling the combustion chamber. If there is no reading, then it will throw a code and you will get horrible gas mileage.

NOTE:
don't gut your cat.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by vlang29 &raquo;</TD></TR><TR><TD CLASS="quote">lol.... you obviously didn't change EVERYTHING..... I got 33-34 highway mpg with my H23.. before it went VTEC.. now it's more like 30 highway</TD></TR></TABLE>

Man... I was hoping you weren't going to make me go there. Well here we go.

Tested or replaced with a known good part.

O2
IAT
TPS
FPR
ECU
Plugs
Wires
PCV
Cap
Rotor
Fuel Filter
Air Filter
Coolant Temp Sensor
Coolant Flush
Thermostat
Checked for vacuum/manifold leaks
MAP Sensor
EGR Valve
Cleaned EGR Ports
Compression Test
Coil
Catalytic Converter
Valve Lash
Timing

I'll add anything I forgot later... Haha now you see why I gave up. I was going to send the injectors off to RC for blueprinting and cleaning, but I needed an excuse to go manual JDM H22A...


Modified by no1knows908 at 10:55 AM 5/12/2008

 

there is another side affect to running rich that people seem to be neglecting and that is significantly reduced motor life. all running rich does is reduce power and suck gas running lean will lead to huge problems later.