Plan tri-jet with pantone Gillier GV for polo petrol

Edits and changes to engines, experiences, findings and ideas.
dede2002
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by dede2002 » 17/02/14, 20:51

Hello,

I am interested in the explanations of your mechanic friend!

An idea would be to make a voltage divider with a battery and a potentiometer, to send 0.5V on the input box of the lambda probe, controlled with a voltmeter.
The probe disconnected, connected to another voltmeter.

The potentiometer will be a "CO screw" at the tdb, the voltmeter of the probe will indicate a possible lack of oxygen.

If I understand correctly there is a presence of oxygen in the exhaust gas, while the steam takes the place of air in the intake.

So we must deplete to compensate for the volume of steam (air less), and impoverish again to have an excess of air?

In excess of air, the catalyst functions in oxidation, but it can no longer treat NOx, which is supposed to be done under lambda 1.
(it's called "3-way catalyst" for 3 treated gases: CO, HC and NOx)
You're going to take it off, I'm curious to see the gas analysis?
Do a non-catalyzed analysis before you start, because there will be CO and HC.

Now (since + 10 years) all cars have 2 lambda probes, one before and one after the catalyst, and even a third NOx probe for direct injections ... it will complicate the situation!

A+
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dede2002
Grand Econologue
Grand Econologue
posts: 1111
Registration: 10/10/13, 16:30
Location: Geneva countryside
x 189




by dede2002 » 17/02/14, 21:05

The ratio of air (lambda) or stoichiometric mixture is a theoretical notion.
In a gasoline engine, there is a stoichiometric mixture at the intake, but there is still the imbrulé esence.
So the corresponding oxygen is also found in the exhaust.

The worse the engine burns, the more oxygen there is in the exhaust!

It is he who makes the probe react.

The catalyst ends up burning the gasoline, when it leaves there is no more oxygen (hopefully).

This is what the second probe controls, to signal any anomaly.

What is your injection system? Do you have the wiring diagram?
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