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.
SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSGMC1992SUBURBAN 1/2 TON 2WD V8-350 5.7LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTESTING AND INSPECTIONSYMPTOM RELATED DIAGNOSTIC PROCEDURESDIAGNOSIS BY SYMPTOMHARD TO START
1992 GMC Suburban 1/2 Ton 2WD V8-350 5.7L
Hard to Start
1992 GMC Suburban 1/2 Ton 2WD V8-350 5.7LSECTION Hard to Start
SYMPTOM DESCRIPTION
Engine cranks OK, but does not start immediately. Will eventually start and run, but may die shortly after.
SYSTEM OR COMPONENT TO CHECK ACTION
FUEL
NOTE Fuel pump should turn "ON" for 2 seconds when
ignition is turned "ON."
CHECK FUEL PUMP RELAY
FUEL PRESSURE
WATER CONTAMINATED FUEL
FAULTY IN-TANK FUEL PUMP CHECK VALVE
This could allow the fuel in the lines to drain
back to the tank after the engine is stopped.
IGNITION CHECK Proper ignition voltage output with
spark tester J 26792 or equivalent (ST-125).
Spark plugs, wet plugs, cracks, wear,
improper gap, burned electrodes or
heavy deposits.
Bare and shorted wires.
Moisture in distributor cap.
Worn distributor shaft.
Pickup coil connections.
NOTE If engine starts, but then immediately stalls,
disconnect the set timing connector. If engine
then starts, and runs OK, replace distributor
pickup coil.
EST CIRCUIT 423 for short to ground.
EMISSIONS CHECK EGR system Valve operation
Engine cranks OK, but does not start immediately. Will eventually start and run, but may die shortly after.
SYSTEM OR COMPONENT TO CHECK ACTION
FUEL
NOTE Fuel pump should turn "ON" for 2 seconds when
ignition is turned "ON."
CHECK FUEL PUMP RELAY
FUEL PRESSURE
WATER CONTAMINATED FUEL
FAULTY IN-TANK FUEL PUMP CHECK VALVE
This could allow the fuel in the lines to drain
back to the tank after the engine is stopped.
IGNITION CHECK Proper ignition voltage output with
spark tester J 26792 or equivalent (ST-125).
Spark plugs, wet plugs, cracks, wear,
improper gap, burned electrodes or
heavy deposits.
Bare and shorted wires.
Moisture in distributor cap.
Worn distributor shaft.
Pickup coil connections.
NOTE If engine starts, but then immediately stalls,
disconnect the set timing connector. If engine
then starts, and runs OK, replace distributor
pickup coil.
EST CIRCUIT 423 for short to ground.
EMISSIONS CHECK EGR system Valve operation
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.