Turbo - Checking Boost During Normal Servicing
84saab01SUBJECT: METHOD FOR CHECKING BOOST DURING
NORMAL SERVICING (DURING ROAD TEST) APC TURBOS, M82-1/2-
ISSUE: 05/84-686
FILE IN S.I. MANUAL:
VOLUME: I
SECTION: 1
PAGE: 62
Effective immediately, the recommended method of checking the charging pressure of Turbos with the APC System at the 1,000-Mile first service and at the prescribed major services is being changed. The practice of checking charging pressure with special gauge P/N 83-92-813 at 3,000 rpm should be discontinued during normal service. Instead, it is sufficient to observe the APC gauge in the instrument cluster during the road test and verify that adequate pressure is being produced and that it is controlled by the APC system.
At full load the gauge will repeatedly deflect slightly down from its full boost indication which indicates knock response and APC control.
Use the 3,000 rpm/brake load method only when it is necessary to obtain an accurate reading, e.g., when making the basic adjustment after a system repair.