Regal V6-231 38L Turbo VIN 8 Fuel Delivery & Air Induction Updates
Low volatility fuel will not vaporize sufficiently to allow normal combustion.
CORRECTION:
Replace Fuel.
DIAGNOSTIC PROCEDURE:
1.
Perform basic system checks in section 6E of the service manual.
2.
Check for service bulletins which relate to cold driveability issues specific to the problem vehicle.
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An updated engine control calibration, or service procedure, may be available to make the engine less susceptible to low volatility fuels.
3.
If basic checks do not reveal a vehicle fault, then advise the customer that fuel quality may be an issue. Recommend the following actions:
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Change brands of fuel
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Use 87 octane gasoline, unless the vehicle is designed for premium gasoline.
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Try to empty the fuel tank as much as practical before refilling.
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Run a minimum of three tanks of new fuel before returning for service.
4.
If above steps are ineffective, do not proceed with additional vehicle diagnosis and/or parts replacement until the fuel tank has been drained and
refilled with a known good quality gasoline AT THE DEALERSHIP.
5.
If the problem remains refer to service manual, service bulletins and/or technical assistance.
REFERENCE INFORMATION
Additional information regarding fuel and its effect on engine driveability can be found in the following booklet and its companion video tape.
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BUICK KNOW-HOW KH-139: Driveability Diagnosis: Fuels
