Oxygen Sensor Dramas - R32 Vs R33 Gtr

[GTSBoy]

Just to confirm my own thoughts? Doesn't the o2 sensor only work during lean cruise?

I thought the ecu only uses it at lean cruise (closed loop monitoring) where it looks for the rich or lean side of lambda.

that's why it flicks around 14.5-15.5-ish back and forth as it continually looks for and aims for lambda 1.

Then when you load the engine from cruise to accelerate it will give a solid afr and richen the more load increases.

Yes, exactly. So faulty O2 sensors just tend to lead to rich cruise running and poor fuel consumption.

The real problem you have is you don't know what is wrong with your car. You have a Mines ECU, so that's one strike against good operation and safety. You have possibly faulty oxy sensors, but you have a wideband telling you that the car is running lean when on boost. You have dirty spark plugs....but that might indicate oil contamination rather than fuel. You have a number of symptoms that may or may not be bad, and they don't all necessarily agree. If you want to take it on a long drive, or even if you want to eliminate some doubt as to how healthy it is, you should just book it into a mechanics with a dyno, slip it on the rollers and check the mixtures at cruise and on load with the shop's wideband. An hour or less and you'll know how things really are.

Edited March 18, 2014 by GTSBoy

[CrimsonLey]

Nick, that sounds exactly how my car us currently acting. Unfortunately, I won't get to take it to a skilled tuner until much later

[GTSBoy]

That's what I see on my wide band anyway,

It will sit around 14.5-16 at cruise and up to 11.2 at wot full boost. And off scale lean under de-cel.

OK, well now you have posted that......that's completely normal.

[Hadouken]

What the he'll? !

You seriously just posted that? That is the same as any other car that runs perfectly fine. Why do you think your 02 sensors are f**ked?