White Exhaust Smoke During Start-Up (Replace Engine Coolant Temperature (ECT) Sensor)
| Subject: | White Exhaust Smoke During Start-Up (Replace Engine Coolant Temperature (ECT) Sensor) |
| Models: | 2000-2002 Chevrolet and GMC WT 5500 Series Medium Duty Tilt Cab Models |
| 2000-2002 Chevrolet and GMC F Model (T-Series) Medium Duty Tilt Cab Models |
| with Isuzu 7.8L Diesel Engine (VIN 3 -- RPO LG4) |
| 1998-2002 FSR/FTR/FVR Isuzu Commercial Vehicles |
| 2000-2002 FRR Isuzu Commercial Vehicles |
| with 6HK1-TC Engine |
This bulletin is being revised to update model years for WT5500 model and add Isuzu to the Models. Please discard Corporate Bulletin Number 01-06-04-049 (Section 06 -- Engine/Propulsion System).
Condition
Some customers may comment on white exhaust smoke during start-up in cold ambient temperatures.
Cause
Low cetane rated fuel may cause this condition.
Correction
A new engine coolant temperature (ECT) sensor has been developed to reduce the white exhaust start-up smoke. Replace the ECT sensor using the procedure listed below.
- Disconnect the electrical connector from the ECT sensor.
- Remove the ECT sensor (1).
- Install the ECT sensor.
- Connect the electrical connector to the ECT sensor.
Tighten
Tighten the sensor to 19.6 N·m(14.5 lb ft).
Parts Information
For Chevrolet and GMC models:
Part Number | Description | Qty |
|---|---|---|
97602019 | Sensor, Engine Coolant Temperature | 1 |
Parts are currently available from GMSPO.
For Isuzu models:
Part Number | Description | Qty |
|---|---|---|
8-97602-019-0 | Sensor, Engine Coolant Temperature | 1 |
Parts are to be obtained from AIPDN.
Warranty Information
For vehicles repaired under warranty, use:
Labor Operation | Description | Labor Time |
|---|---|---|
J6368 | Sensor, Coolant Temperature - Replace | 0.3 hr |
