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 MANUALSCHEVROLET1990G 20 VAN V8-350 5.7LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTESTING AND INSPECTIONSYMPTOM RELATED DIAGNOSTIC PROCEDURESDIAGNOSIS BY SYMPTOMSTALLS AFTER START - COLD
1990 Chevrolet G 20 Van V8-350 5.7L
Stalls After Start - Cold
1990 Chevrolet G 20 Van V8-350 5.7LSECTION Stalls After Start - Cold
Definition: Engine at room or outside temperature, within three minutes after start. (1) Stalls after brief idle; (2) dies as soon as any load is placed on engine (such as A/C turned "ON" or transmission engaged); or (3) Dies on initial drive-away. If symptom is present cold and hot, go to symptom "Stall After Start - Hot".
- Visual (physical) check:
- Vacuum hoses for splits, kinks and proper connections as shown on Vehicle Emission Control Information label.
- Make sure hot air tube is connected to air cleaner.
- Check proper operation of the THERMAC.
- Check carburetor choke valve, throttle linkage and fast idle cam for sticking.
- With engine running, visually check vacuum break linkage for movement while removing and re-installing vacuum hoses to vacuum breaks. If the linkage does not move and vacuum is at hose, check for binding linkage. If linkage is OK, replace vacuum break unit.
- With engine "OFF", check all choke adjustments, including vacuum breaks and TVS if used.
- Check fast idle speed setting and curb idle speed.
- Check carburetor accelerator pump operation.
- Check EFE valve for proper operation. EFE valve should be closed cold.
- Check EGR valve for proper operation.
- Check engine timing.
- Poor or contaminated gasoline. Suggest owner try different brand.
- Visual (physical) check:
- Vacuum hoses for splits, kinks and proper connections as shown on Vehicle Emission Control Information label.
- Make sure hot air tube is connected to air cleaner.
- Check proper operation of the THERMAC.
- Check carburetor choke valve, throttle linkage and fast idle cam for sticking.
- With engine running, visually check vacuum break linkage for movement while removing and re-installing vacuum hoses to vacuum breaks. If the linkage does not move and vacuum is at hose, check for binding linkage. If linkage is OK, replace vacuum break unit.
- With engine "OFF", check all choke adjustments, including vacuum breaks and TVS if used.
- Check fast idle speed setting and curb idle speed.
- Check carburetor accelerator pump operation.
- Check EFE valve for proper operation. EFE valve should be closed cold.
- Check EGR valve for proper operation.
- Check engine timing.
- Poor or contaminated gasoline. Suggest owner try different brand.
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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.