Originally Posted by chxf
Hi HDDP
I really wonder how you know the specific sound of farting into an empty beer can *lol*
I'm surprised you haven't heard of our famous quartet ! We make the sweetest music with beer cans LOL...
Originally Posted by chxf
I read though the posts and must admit that I didn't understand everything, especially some terms. So if I write something you already discussed - sorry.
For what I know the O2 sensors in the exhaust gives the voltage signal (according to O2 flow) to the main chip which regulates the air/fuel ratio by adjusting the injector pulse. When you said you unplugged the sensors, the circuit is open and most chips then ignore signals from these O2 sensors and produce a standard air/fuel ratio information for injection.
I only removed the three 02 sensors while I had the entire exhaust system removed from the car, at which time the CEL "Check Engine Light" illuminated. I only had the sensors removed temporarily, while I gutted the four catalytic converters.
Originally Posted by chxf
So in this case the check engine must not light. Like it doesn't when the sensors are out of operating temperature when the engine and the sensor heating is cold. But the air/fuel ratio in such an open circuit is always the same whether the engine is cold or not, under load or idle. This might be why your exhaust smells. And maybe your mpg will drop.
Once I re-installed the exhaust system (with gutted cats) and replaced the 02 sensors, the CEL did not illuminate as expected... It has been a common myth that if you remove the contents of a catalytic converter on a car that is equipped with ODB2 or ODB3, the CEL will illuminate. This is not the case on my '04 Crossfire... I think the myth is propagated to deter people from removing the catalytic converter. Understandably so !!!
The increased odor is a testament to the effectiveness of the catalytic converter and how well it scrubs the hydrocarbons from the exhaust. It now smells like really noxious exhaust fumes. kinda like an old '65 V8 that is running rich !!!