CATEGORY:    TECHNICAL

ATTENTION:   ALL DMC DEALERS/SERVICE MANAGERS

SUBJECT:     ENGINE PERFORMANCE

In the event of a poor engine performance complaint, as one of the
initial steps to proper connections of the engine vacuum hoses
should be checked as per the diagram below.

Since the connections at the thermal control valve (located under
the intake manifold) are not visible, the following quick test
should be made to verify correct connections of the hoses.

Explanation:  When the engine is cold, the thermal control valve
              directs vacuum to the control pressure regulator.
              After the engine is warmed up, the thermal control
              valve then shuts off vacuum to the control pressure
              regulator and directs vacuum to the distributor
              advance solenoid.

To Check:     For proper hose routing at the valve, check to see
              if vacuum is present at the control pressure regulator
              upon cold initial start-up at idle.  Then, after
              vehicle warms up, check to see if vacuum exists at
              the distributor advance solenoid.
Please inform all personnel accordingly. Lutz Feuerabendt Technical Service Manager Issued 12/4/81