Error p0420 after hho kit installed (ecu/o2 sensors not modified)
Hi all, finnally i got my new hho kit installed on my honda stream 2.0 vtec and it seemed to work quite well beause setting the pwm at very low level it bubbles quite fast.
Altought i haven´t had time enought to notice any power or consumption improvement the check engine error has appeared in my dashboard , the error is p0420 , i haven´t been modifying anything else like o2 sensor , i just installed the kit. Why this should this be affecting the to the cattalyst efiency??? this error becomes from the second o2 sensor , am i right???
Thanks a lot!!!.
You have incorrectly assesed the situation.
Quote:
Originally Posted by
Havens78
You are producing too much gas from your kit, the 2nd o2 sensor is reading the extra oxygen and is telling your honda that it is running lean. Your engine will fix this by pushing more gas down its own throat and your efficiency will go down, you're still burning hydrogen but using more gas at the same time because of the computer. Slow that pwm down to the point that you aren't getting a code and that is good place to start.
The downstream O2 sensor does NOTHING to affect the engine operations.
Also, you and others, repeatedly quote how too much HHO throws off the upstream O2 exhaust mixture. Please, clarify your thinking for the reader. HHO is a stoichiometric (balanced) mixture of hydrogen and oxygen. When it burns, it does so to a complete burn that leaves no excess oxygen for the O2 sensor to detect. So, why does HHO throw off the mixtures? Your explanation and conclusion is erroneous and incomplete.
It would help if you knew more about modern engine tuning.
Quote:
Originally Posted by
Havens78
I am simply answering to the best of my knowledge based on the experiences that I have seen while experimenting. I do not claim to have all of the answers or do I claim to know what is happening to my engine inside the combustion chamber. I know that a complete burn will not have more oxygen, so how can my o2 sensors read too much oxygen and then give me a code? And why does that code result in more gas being spent into the engine by the computer? I don't know... but when I have in the past backed off the amount of hydrogen I am producing my gains return based on how i'm driving.
If I am wrong on this explanation than I apologize to the tenth degree, but these were my experiences with my experiments.
It is simple to use a scanner in most OBDII systems to see the O2 sensor outputs as well as the fuel trim and ignition timing. Of course, you MUST know your particular engine system to be able to decipher what is happening and what adjustments to make. This is one of the reasons HHO applications are all over the place. Sweeping answers do not take into account the different ways manufacturers handle the same situation.
The original poster has run into this and others will too.
Torque should allow you to read your O2 sensor outputs.
Maybe Torque Pro. But, it seems folks on Youtube are doing so.