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 DIAGNOSISPOWERTRAIN MANAGEMENTEMISSION CONTROL SYSTEMSEXHAUST GAS RECIRCULATIONTECHNICAL SERVICE BULLETINSRECALLSRECALL - LINEAR EGR SYSTEM STICKING OPEN/CLOSEDSERVICE PROCEDURE
1993 Chevrolet Astro Van M V6-262 4.3L VIN Z
Service Procedure
1993 Chevrolet Astro Van M V6-262 4.3L VIN ZSECTION Service Procedure
System Check:
Check for Diagnostic Test Code (DTC) 32 with Tech 1 or Tech II. If DTC 32 is not present, perform LEGR Debris Purge and Function Test (listed below) to verify normal operation of the LEGR Valve. If the LEGR system is operating properly, inform the customer that their vehicle does not have the condition listed in the owner letter. If poor driveability conditions persist, inform the customer that any further diagnosis and repairs will be at their expense if vehicle is outside the parameters of the new vehicle warranty.
Correction:
If DTC is present, install new Memcal from the PARTS INFORMATION tables listed in this bulletin. After installing the new Memcal, perform the LEGR Debris Purge and Function Check listed below.
LEGR Debris Purge and Function Check:
Using a Tech I or Tech II, with transmission in park, and parking brake applied. With engine at 1,500 RPM, command the LEGR valve to 100% position. Then command the LEGR valve to 0% position while monitoring actual and desired LEGR position. This procedure is intended to clear any foreign material from the valve.
Did the LEGR valve desired position agree with the actual position? If yes, the LEGR valve is functioning normally. If not, repeat the debris purge test, If the desired and actual valve positions still do not agree, refer to DTC 32 section of the Driveability and Emissions manual.
Vehicle (LEGR) Road Test:
If the engine is operating normally after the Memcal replacement and/or LEGR valve replacement (if necessary after referring to DTC 32 section of the Driveability and Emissions manual), a road test should be performed. During vehicle road test, after installing the new Memcal, the technician may notice increased LEGR valve activity during light throttle maneuvers, This increased activity is due to the LEGR valve stroking during which time the actual position will momentarily exceed the desired position. This is normal LEGR function with this calibration. Road test the vehicle for reported driveability concerns and verify LEGR function. Have any noted problems been corrected? If yes, system is OK; return vehicle to customer. If not, refer to appropriate section of the Driveability and Emissions manual.
Check for Diagnostic Test Code (DTC) 32 with Tech 1 or Tech II. If DTC 32 is not present, perform LEGR Debris Purge and Function Test (listed below) to verify normal operation of the LEGR Valve. If the LEGR system is operating properly, inform the customer that their vehicle does not have the condition listed in the owner letter. If poor driveability conditions persist, inform the customer that any further diagnosis and repairs will be at their expense if vehicle is outside the parameters of the new vehicle warranty.
Correction:
If DTC is present, install new Memcal from the PARTS INFORMATION tables listed in this bulletin. After installing the new Memcal, perform the LEGR Debris Purge and Function Check listed below.
LEGR Debris Purge and Function Check:
Using a Tech I or Tech II, with transmission in park, and parking brake applied. With engine at 1,500 RPM, command the LEGR valve to 100% position. Then command the LEGR valve to 0% position while monitoring actual and desired LEGR position. This procedure is intended to clear any foreign material from the valve.
Did the LEGR valve desired position agree with the actual position? If yes, the LEGR valve is functioning normally. If not, repeat the debris purge test, If the desired and actual valve positions still do not agree, refer to DTC 32 section of the Driveability and Emissions manual.
Vehicle (LEGR) Road Test:
If the engine is operating normally after the Memcal replacement and/or LEGR valve replacement (if necessary after referring to DTC 32 section of the Driveability and Emissions manual), a road test should be performed. During vehicle road test, after installing the new Memcal, the technician may notice increased LEGR valve activity during light throttle maneuvers, This increased activity is due to the LEGR valve stroking during which time the actual position will momentarily exceed the desired position. This is normal LEGR function with this calibration. Road test the vehicle for reported driveability concerns and verify LEGR function. Have any noted problems been corrected? If yes, system is OK; return vehicle to customer. If not, refer to appropriate section of the Driveability and Emissions manual.
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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.