Technical Service Bulletin Load Surging

Subject: Load Surging  Models: 911 Turbo ALL

Bulletin Number: 77-03

Engine surging at part throttle under load (similar to ignition misfiring) can be caused by a leaking intake manifold gasket

surging diagram img..
  •  Replace gasket or gaskets as required (see illustration)

Part Required:

Gasket          Part Number 930.110.197.01


There are 12 identical gaskets- 6 between intake manifold and intermediate flanges; 6 between intermediate flanges and heads. Any of these, if a leaking, could cause erratic engine performance.

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