Supplement to 03-06-04-002 4HE1-TC Diesel Engine - Cold Weather No Start - kw temperature Isuzu
| Subject: | Supplement to 03-06-04-002 4HE1-TC Diesel Engine - Cold Weather No Start |
| Models: | . |
When servicing the vehicle with the VIN you entered, the following diagnosis might be helpful if the vehicle exhibits the described symptoms.
Condition/Concern:
Some dealers and customers have reported a no start or hard start condition in extremely cold sub-zero temperature weather on N/W models with the 4HE1-TC diesel engine after being shutdown for a period of time. Vehicles may not restart after a cold soak in sub-zero ambient temperatures after a shutdown period of more than 20 minutes. Even after installation of the fuel injection pump electric heater as released in Service Bulletin #03-06-04-002, vehicles may not restart after the above mentioned cold soak when the injection pump heater cannot be plugged in. Customers express concerns that their vehicles may not restart after shutting them down to make deliveries during cold weather operation.
Recommendation/Instructions:
A new diesel fuel injection pump insulated cover has been released to retain heat in the pump and improve extreme cold weather restarts. The new insulated cover is molded for an exact fit over the injection pump and clears all attaching hardware, lines and fittings. In those geographic areas that are most affected by sub-zero temperatures, it is recommended that the new insulated injection pump cover be used in combination with the injection pump electric heater for optimum cold soak restart performance. Injection Pump Insulated Cover Parts Information:
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DESCRIP-TION | PART NUMBER | QUANTITY |
|---|---|---|
Insulated Cover | 8-97170-784-0 | 1 |
Clip | 8-97037-154-0 | 1 |
Stud Bracket | 5-09309-006-1 | 1 |
Cap | 8-97190-450-0 | 2 |
Stud Cover | 8-97212-809-0 | 2 |
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NOTE: Contact GM Isuzu Commercial Truck Technical Assistance for detailed instructions on installing the injection pump insulated cover. Refer to Service Bulletin # 03-06-04-002 for injection pump electric heater part number and installation instructions.
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Please follow this diagnosis process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed. If these steps do not resolve the condition, please contact GM TAC for further diagnostic assistance. This diagnostic approach was developed for the vehicle with the VIN you entered and should not be automatically be used for other vehicles with similar symptoms.
Models:
1999-Interim 2004 Chevrolet GMC Medium Duty W35/45, Isuzu NPR Low Cab Forward Models
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