Hard Start/Detonation - Reference Sensor Shield (GROUP 2, NO. 8703)

Publication date: 1987-02-20
Reference number: GROUP 2, NO. 8703

HARD START/DETONATION - REFERENCE SENSOR SHIELD

TECHNICAL SERVICE BULLETIN

Reference Number(s): GROUP 2, NO. 8703

HARD STARTING AND DETONATION

Model: Porsche 924S, 944, 944S, 944 Turbo

Group: 2

No: 8703

Date: February 20, 1987

SERVICE INFORMATION

For Model '87 the opening in the clutch housing (Arrow B) for the speed and reference sensors is slotted. Because of this, it is possible the reference mark sensor may be inadequately shielded from magnetic interference from the starter during cranking (see Fig 1 ).

If detonation (pre-ignition) occurs during cranking and starter operation is labored, a reference sensor shielding sleeve and bracket should be installed.

The reference sensor shielding sleeve is installed in production from VIN:

92 HN 453769 924S

94 HN 472809 944

94 HN 451857 944 S

95 HN 151023 944 Turbo

It is planned to modify the clutch housing opening for the speed and reference sensors (Arrow A) for improved shielding effect later in production. Holes instead of slots will be used.

Fig 1: View of Clutch Housing