AW: DIY_EFI Digest V5 #909

[Jens Knickmeyer]

Hi everyone,

up to now, I thought I knew how an EGO works. But now
I am not so sure....

I just took a look at my data logged on today's drive to France
(took about 1 hour). I set up my data logger to log rpm, injection
time, engine temp and lambda voltage. Note that all data is not measured
by seperate measurement equipment but I receive data directly from the
ECU by using K-Line communication. Looking at lambda voltage,
I recognized that the ECU sometimes tells a value of 1.85V. AFAIK, lambda
voltage
is limited by approx. [0.1V, 0.85V]. I tried to recognize any correlation
between lambda voltage and any other signal, but I couldn't. The 1.85V
occurr instead of the 0.85V I would have expected. The "lean" voltage of
0.1V is reached in every cycle, no problem there.

My questions:
Is there any chance that an EGO produces such a high voltage (which
would indicate "ultramegahyperrich" mixture)?
Can anyone imagine a defect which results in such a high lambda voltage?
Can an interference with other substances/gases produce such a high
voltage?

Regards,

Jens Knickmeyer
'92 Volkswagen Polo G40

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