Oxygen sensor

[DOG ON]

I am finishing my prerunner, I have put the original ECU on the engine, nevertheless sometimes I feel the exhaust fumes are too rich and my eyes can get irritated fast in a fairly enclosed garage....

I think this is because I didn't use the oxygen sensor in the exhaust manifold as you can see in the picture.....

The car works fine , except for that little problem....can this lead to ECU going crazy and command an injector to flood a chamber , then having a bent connecting rod?

Can I do without the oxygen sensor safely?

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[B Page]

I am new to this game; but I am not new to engine tuning.

Is there some valid reason not to use an O2 sensor? Are they known to cause problems during a race?

The computer only needs a couple inputs to operate properly, and the O2 is one of them. It will run better as the air temps changes, elevation changes, fuel quality changes, etc. It will allow the engine to live longer, as the cylinders won't get washed with fuel, etc.

Without the O2 sensor signal coming in, the ECU usually goes into some type of "limp" mode, or defaults to a specific fuel curve, based on RPM or mass-air-flow.

[steveG]

You definitely need an Oxygen sensor. You should run every sensor the system originally came with. If you're not, you're not going to get maximum performance or fuel economy out of it. Also make sure you have a functioning check engine lamp. Otherwise you won't know when there's problem.

[DOG ON]

Is there a specific practice or precautions installing an oxygen sensor in an offroad application? Dos, donts?

[steveG]

Is there a specific practice or precautions installing an oxygen sensor in an offroad application? Dos, donts?

Do: Install it.

Don't: Not install it.

HA!

Seriously, though, I would put it on the header at the collector. If you don't want to ruin the finish on the headers you could put it in the pipe that attaches it.

[B Page]

I would mount the O2 sensor near your collector flange; so it will stay hot during operation and you can use a more simple O2 sensor.

If you mount it closer to the exhaust tip (cooler exhaust), you will need a heated O2 sensor. The heated ones are more complex and need more wireing.

[steveG]

I would mount the O2 sensor near your collector flange; so it will stay hot during operation and you can use a more simple O2 sensor.

If you mount it closer to the exhaust tip (cooler exhaust), you will need a heated O2 sensor. The heated ones are more complex and need more wireing.

I would use whatever the ECM was designed to use.

[cancinoj]

have heard of people test-tunning an engine just by connecting a digital voltmeter to the o2's to see if the mix is the way they want, not to lean, not even normal, they want it a little bit above normal to prevent head or piston melting,, something like that you know,. on our case the ecu detected a lean mixture on one side of the engine,. end up to have clogged fuel injectors, they not just tell the ecu if something is wrong but also they ar used during normal operation to get the best performance out of your engine,. i dont know if i made my self clear, im not an expert, but thats what i know , haha,. good luck,.keep us updated to see if you fix that, thks,.

[clogking]

Do use O2 sensor
Don't run Race fuel with lead in it!

[DOG ON]

I had an awesome test run yesterday, I will follow all the advice here......
Meanwhile, let me post a pic of how the car is looking , I just finished and I am a proud Papa!