[mark houghton]

Originally Posted by Mustangkev

There’s an enrichment relay on the 86-89 930 under the drivers seat next to the k-jetronic box. It looks like it adjusts the frequency valve based on the described in link below.

https://cis911primer.com/pages/descr_lambda.html

Interesting. I always assumed that functioned only as part of the lambda control system as part of the feedback loop from the oxygen sensor.