Engine - Intermittent No Start Condition
88chevy14Number: 88-285-6D
Section: 6D
Date: JULY, 1988
Subject: INTERMITTENT NO START CONDITION
(REPLACE DIS CRANKSHAFT SENSOR)
Model and Year: 1987-88 CELEBRITY WITH 2.5L ENGINE (VIN CODE R)
TO: ALL CHEVROLET DEALERS
Some vehicles may experience an intermittent no-start condition ("cranks but won't run"), due to an intermittent electrical connection between the Direct Ignition System (DIS) module and crankshaft sensor. The no-start condition is most likely to occur when the engine is cold.
Examination of warranty material has shown that this condition is being improperly diagnosed as a DIS module condition, resulting in repeat comments and customer dissatisfaction. Because the integrity of the connection between the module and crankshaft sensor is provided by the sensor terminal design, replacing the DIS module will not provide a lasting fix for the intermittent condition.
When a comment of an intermittent no-start condition occurs and the usual diagnostic procedures do not identify a cause, replace the DIS crankshsft sensor. The DIS module should be replaced only in instances where previous replacement of the DIS crankshsft sensor did not correct an intermittent no-start condition.