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Questions tagged [lambda]

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5
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4answers
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What causes narrowband O2 sensor behaviour?

It's a given that narrowband O2 sensor (Lambda) output swings up and down within the 0-0.9v range, but everywhere (on the 'net including here) I am seeing people say this is due to the ECU in closed ...
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2answers
61 views

Procedure for measuring Lambda values at PUC Centres

What is the latest procedure of BS IV (Euro IV) petrol-engined cars in PUC Centres? As far as I know in Petrol Cars the car is kept idling without the Accelerator pressed, while in Diesel Cars the ...
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votes
3answers
1k views

Removing stubborn o2 sensor - danger of stripping thread?

(2002 Toyota Previa/Estima/Tarago ACR30, engine 2AZ-FE) One of my two pre-cat O2 sensors is faulty. The garage I put the car in did not manage to replace it - they told me it is stubborn and that ...
1
vote
1answer
311 views

What formula is used when deriving AFR/lambda value from emissions?

When you get your vehicle hooked up to a gas analser, you'll see the 4 or 5 kinds of emissions you're interested in, and a lambda or AFR value derived from those emission values. I was wondering how ...
5
votes
2answers
86 views

Is there a chemical limitation to the mixture an engine can maintain?

I know that the question/title is a bit ambiguous, but I couldn't wrap it in a single sentence, so please let me elaborate. You can change the mixture of an engine for whatever reason. Because of ...
5
votes
1answer
97 views

How much leaner can you responsibly run an old engine?

I've got a '76 Triumph TR7 and I was wondering this after I got its carbs tuned after its restoration. As many of you may know, old engines are initially not capable of running as lean as modern ...
3
votes
1answer
3k views

Very high short term fuel trim

I was checking my short term fuel trim numbers and o2 sensor switching speed as I think my post-cat sensor has degraded. The car is not throwing a code, and I don't believe that there's a hole in the ...