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 MANUALSCHEVROLET1991S10/T10 P/U 4WD V6-262 4.3LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSRELAYS AND MODULES - COMPUTERS AND CONTROL SYSTEMSENGINE CONTROL MODULETECHNICAL SERVICE BULLETINSCUSTOMER INTERESTENGINE - STALLS/CRANKS BUT FAILS TO START
1991 Chevrolet S10/T10 P/U 4WD V6-262 4.3L
Engine - Stalls/Cranks But Fails to Start
1991 Chevrolet S10/T10 P/U 4WD V6-262 4.3LSECTION Engine - Stalls/Cranks But Fails to Start
90Chevy33
Number: 91-47-6
Section: 6
Date: August 1990
Corp. Bulletin No.: 066420R
Subject: INTERMITTENT ENGINE STALL
Model and Year: 1991 S/T TRUCKS BUILT AT PONTIAC WEST ASSEMBLY
TO: ALL CHEVROLET DEALERS
CONDITION:
Some 1991 S/T Trucks built recently at Pontiac West Assembly may be subject to an intermittent engine stall, or a condition where the engine will crank but fails to start. Suspect vehicles were built within the following VIN's:
M0143685 thru M0145343
CAUSE:
This condition is caused by a connector pin that was not manufactured to specification and results in a intermittent loss of contact due to a loose connection at Terminal A-6 (pink wire with black stripe) of the 24 pin ECM connector.
CORRECTION:
For vehicles within the VIN range given above which experience an intermittent engine stall, or fail to start during engine crank, the following procedure should be performed to correct the condition.
1. Remove the 24 pin connector from the ECM (does not require ECM removal).
2. Remove the blue terminal lock from the "A" row side of the connector.
3. Using instructions on Page 3-93 of the 1990 Fuel & Emissions Book (X-9036), remove terminal A-6, pink wire with black stripe, (Circuit 439) from connector.
4. Using a .95 mm pin gage, check terminal A-6 for correct tension. A good terminal will not allow the pin gage to be inserted without a small amount of force. If the terminal has a loose connection, replace the terminal with P/N 12020757. Do not probe the terminal with anything other than the pin gage, as probing could damage a good terminal.
5. After replacing or checking the terminal, reinstall into the ECM connector and reattach the blue terminal lock. Reinstall the connector into the ECM.
6. Test vehicle by restarting engine and gently moving wiring harness back and forth at 24 pin ECM connector to assure condition has been eliminated.
Number: 91-47-6
Section: 6
Date: August 1990
Corp. Bulletin No.: 066420R
Subject: INTERMITTENT ENGINE STALL
Model and Year: 1991 S/T TRUCKS BUILT AT PONTIAC WEST ASSEMBLY
TO: ALL CHEVROLET DEALERS
CONDITION:
Some 1991 S/T Trucks built recently at Pontiac West Assembly may be subject to an intermittent engine stall, or a condition where the engine will crank but fails to start. Suspect vehicles were built within the following VIN's:
M0143685 thru M0145343
CAUSE:
This condition is caused by a connector pin that was not manufactured to specification and results in a intermittent loss of contact due to a loose connection at Terminal A-6 (pink wire with black stripe) of the 24 pin ECM connector.
CORRECTION:
For vehicles within the VIN range given above which experience an intermittent engine stall, or fail to start during engine crank, the following procedure should be performed to correct the condition.
1. Remove the 24 pin connector from the ECM (does not require ECM removal).
2. Remove the blue terminal lock from the "A" row side of the connector.
3. Using instructions on Page 3-93 of the 1990 Fuel & Emissions Book (X-9036), remove terminal A-6, pink wire with black stripe, (Circuit 439) from connector.
4. Using a .95 mm pin gage, check terminal A-6 for correct tension. A good terminal will not allow the pin gage to be inserted without a small amount of force. If the terminal has a loose connection, replace the terminal with P/N 12020757. Do not probe the terminal with anything other than the pin gage, as probing could damage a good terminal.
5. After replacing or checking the terminal, reinstall into the ECM connector and reattach the blue terminal lock. Reinstall the connector into the ECM.
6. Test vehicle by restarting engine and gently moving wiring harness back and forth at 24 pin ECM connector to assure condition has been eliminated.
RENDER: 1.0x
NO RELATED
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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.