Hi all.

 

I have had the Lambda sensor (is that how you spell it!?)replaced on the passenger side. Now at idle it is quite lumpy. Should i now reset the ECU?

 

I have done a search on this and am i right in saying all i have to do is disconnect the battery for 30 minutes.

 

Any advice / help is most appreciated.

 

Regards

 

Ian

 

PS: I was a lawyer some 5 years back but got fed up with the work, clients and late nights.

They should have reset it when they put it in.

 

Yes it should be reset so the car can "learn" again.

 

The Lambda sensors are commonly known as O2 sensors on the 300ZX.

 

Stuart

Thanks SRRAE.

 

Just taken it out after resetting the ECU. Seemed a bit lumpy and slow. How long does it take to relearn? do i need to take it out on a long run?

 

Cheers

ian

Leave the battery disconnected for an hour or so just to make sure, but bewarned you car will run likesheet for the first couple of hundred miles as the ECU has to relearn (as SRRAE says above).

 

Did you have both O2 sensors replaced or just one ?

Thanks SMW1.

 

They only replaced one side which had failed. It does run like sheet so at least i now know it will get better. I shall be patient.

 

Seems to have cured the blue smoke at idle aswell.

 

Bizarre.

 

Cheers

Ian

A dodgy O2 sensor will give you a lot of carbon build up, i.e. soot.

 

If you have a twin zorst it may be worth cleaning the insides of the tail pipes and checking them ever few days. If you see a difference in the build up of soot between the two sides then you know the other O2 sensor is a little lazy and will need replacing soon.

 

I have a section on my web site about replaceing the O2 sensors, it's not a big job, just a little tricky unless you have the right tools.

 

http://www.300zx-mods.co.uk/O2.htm

Thanks SMW1. I have had a look at your website. Very good. I will clean the exhaust pipes and see if the other O2 sensor is lazy. Thanks for your help. Cheers Ian

The ECU can tell you of O2 failure but doesnt detect when the O2 sensor is just giving uncorrect feedback

 

The battery needs to be disconnected for about 45 mins, and then needs about 200 miles to "Learn" again.

 

Stuart