6000 V6-173 2.8L (1988)
Crankshaft Position Sensor: Technical Service Bulletins
Engine Controls - Crankshaft Sensor R&R Precautions
Bulletin Number:
89-6-38
Reference Number:
936509
Publish Date:
4/89
IMPROPER CRANKSHAFT SENSOR REPLACEMENTS
Subject:
DUE TO OIL ON THE SENSOR (DIAGNOSIS)
Models
1988-89 6000 AND GRAND PRIX WITH 2.8L,
Affected:
3.1L ENGINES WITH DIRECT IGNITION SYSTEM
(DIS)
Condition:
Crankshaft sensors returned from dealerships show a very high percentage of NTF (No Trouble Found) units.
Cause:
The sensors are usually replaced because of a driver comment of intermittent reduced performance, hesitation, or no start. When diagnosing the ignition
system, the crankshaft sensor is found to be wet with oil, and is replaced. The oil, however, will not cause an operational problem with the ignition
system, and the sensor should not be replaced for this reason.
The likely cause for the performance condition is an intermittent connection to the sensor. Replacing the sensor may fix the condition for a time, but the
vehicle could return at a later time with the same condition.
Correction:
1.
DO NOT replace the sensor because oil is found in the sensor. The sensor should only be replaced if diagnosis (such as CAMS or the Service
Manual procedure) indicates that it is defective. The sensor may also be replaced if an oil leak is the original concern (this is very rare).
2.
Check the wire harness connector to the sensor for proper, contact. The wire terminals, or the connector body itself, may be replaced if necessary.
