Engine - Hard Starting and Detonation
87porsche03Subject: Shielding Sleeve for Reference Mark
Sensor to Correct Hard Starting and Detonation (Ping)
Model 924S, 944, 944S, 944 Turbo
Group
2
Part Identifier
N/A
Number
8703
February 20, 1987
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.
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 944S
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.