Opel/Vauxhall´s unconnected socket in the engine bay

[Alexander Wenning]

Hi there,

Opel/Vauxhall engines do have an unconnected socket in the engine bay. The 
official workshops have the possibility to connect a coloured (blue, yellow, 
red, ...) plug in order to enrich or lean the mixture if the car doesn´t match 
the emmision laws. The cars have these sockets independent to the 
manufacturer of the ECU (Delco, Siemens, Bosch). Depending on the colour of the 
plug the mixture goes rich or lean. This would be a lovely way to increase the 
car´s performance output as these cars are fairly too rich and could produce 
more power on a lean mixture.

Does anybody know about these plugs and their function?

Regards

Alex from Wenning Motorsport / Germany.