Main Menu

Power loss during boost

Fuel System

Vehicle Information: Year: 1987; Engine (Size, Modifications): 3.3L (headers and exhaust replaced); Total Mileage: 64000;

My 1987 930 loses power when on boost at about 2/3 throttle. Power comes back at full throttle. The problem also goes away when I disconnect the Oxygen sensor, so I presume the problem lies with one of the components in the lambda circuit. I have replaced the oxygen sensor and the new sensor appears to be working (the voltage at the oxygen sensor lead is in the right range). Is there a way to tell whether the frequency valve or the lamda control unit might be defective? Are there other components in the lambda circuit that should be checked?

You must log in to view answers associated with technical questions. Join PCA to participate in our community.
0
No votes yet