Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET1993ASTRO VAN M V6-262 4.3L VIN ZREPAIR AND DIAGNOSISTECHNICAL SERVICE BULLETINSALL TECHNICAL SERVICE BULLETINSEGR SYSTEM CHECK - UPDATED CHART
1993 Chevrolet Astro Van M V6-262 4.3L VIN Z
EGR System Check - Updated Chart
1993 Chevrolet Astro Van M V6-262 4.3L VIN ZSECTION EGR System Check - Updated Chart
File In Section: 6E - Engine Fuel & Emission
Bulletin No.: 51-65-15
Date: April, 1995
SERVICE MANUAL UPDATE
Subject:
Sections 9, 9A, 9B - Driveability Emissions and Electrical Diagnosis - Revised "EGR System Check with Negative Back Pressure EGR Valve" Chart
Models:
1991-95 Chevrolet and GMC Truck M/L, C/K, G, R/V, S, P3, P/G Models with 2.2L, 2.5L, 4.3L, 5.0L Engines (VINs 4, A, Z, E, H - RPOs LN2, L38, LB4, LO3) without 4L8OE Transmission
This bulletin advises of a chart revision in the following service manuals:
1991 Light Duty Truck Fuel and Emissions, page 9-5
1992 Light Duty Truck Fuel and Emissions, page 9-7
1993 Light Duty Truck Fuel and Emissions, page 9A-5
1994 S/T G, C/K, P3 and P/G Driveability Emissions and Electrical Diagnosis, page 9B-5
1995 S/T Driveability Emissions and Electrical Diagnosis, page 9B-5
Bulletin No.: 51-65-15
Date: April, 1995
SERVICE MANUAL UPDATE
Subject:
Sections 9, 9A, 9B - Driveability Emissions and Electrical Diagnosis - Revised "EGR System Check with Negative Back Pressure EGR Valve" Chart
Models:
1991-95 Chevrolet and GMC Truck M/L, C/K, G, R/V, S, P3, P/G Models with 2.2L, 2.5L, 4.3L, 5.0L Engines (VINs 4, A, Z, E, H - RPOs LN2, L38, LB4, LO3) without 4L8OE Transmission
This bulletin advises of a chart revision in the following service manuals:
1991 Light Duty Truck Fuel and Emissions, page 9-5
1992 Light Duty Truck Fuel and Emissions, page 9-7
1993 Light Duty Truck Fuel and Emissions, page 9A-5
1994 S/T G, C/K, P3 and P/G Driveability Emissions and Electrical Diagnosis, page 9B-5
1995 S/T Driveability Emissions and Electrical Diagnosis, page 9B-5
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.