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Discussion Starter #1
Hi,
drive a 1800 ecotec Vectra year 2000. Just failed MOT on high CO on slow idle. Get off slow idle and CO drops to nearly zero. Everything else ok, Lamda was at 1 but did see it drop to about .9 during high CO reading??
Can anyone help please:shame:
It is sugested I have an Air leak??? where do I start looking??
 
C

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Bastards could have revved it up on idle for you! :bust:

My M3 did the same, lucky I know the tester.......

Been told by a very knowledgable source it's the lambda sensors on mine:

If they are over 60K miles old then they will be past their prime, that's for sure.
It is then a good idea to change them, if anything for better mpg.

On idle/low load your car should have AFR 14.7, as you know. A tired O2 sensor will make it look leaner, so the ECU will be throwing more fuel to make it 'look' good.
It's standard practice.
Then the excess carbon piles up on the O2 sensor and it dies even quicker. You don't get an ECU fault until much later, when the sensor is totally dead. It could take years.
 

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Discussion Starter #3
Thanks, my engine has 103000 on so it fits the bill, had it on diagnostics and didnt show any faults, again as you describe. I am getting to the point when anything is worth a try.
 

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vectra emissions

ive got exactly the dame problem with my vectra, please would you mind telling me if you resolved this issue its doing my head in too....thanks
 

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To check the lambda ...

See the links I posted in this thread (sounds like the same car)
 
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