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 MANUALSCHEVROLET1991SUBURBAN 1/2 TON 4WD V8-350 5.7LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTAPPLICATION AND IDENGINE SYSTEM IDENTIFICATION
1991 Chevrolet Suburban 1/2 Ton 4WD V8-350 5.7L
Engine System Identification
1991 Chevrolet Suburban 1/2 Ton 4WD V8-350 5.7LSECTION Engine System Identification
ENGINE SYSTEM IDENTIFICATION
Transmission Identification 4L80-E:
Engine Vin Code ID [1] K
Engine V8-350/5.7L
Fuel Control System Throttle Body Fuel Injection
Ignition System High Energy Ignition W/Electronic Spark Timing & Electronic Spark Control (HEI-EST-ESC)
Computer System [2] Computer Command Control (ECM or PCM)
Remarks:
[1] The eighth digit of the VIN denotes engine code.
[2] Transmission application determines computer system.
a. If truck has 4L80-E transmission it has a PCM.
b. Look at pan shape and number of bolts for identification. PCM illustrated
RENDER: 1.0x
NO RELATED
Recommended Tools & Savings
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
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.