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 MANUALSCHEVROLET1990LUMINA APV V6-191 3.1LREPAIR AND DIAGNOSISENGINE, COOLING AND EXHAUSTENGINETECHNICAL SERVICE BULLETINS
1990 Chevrolet Lumina APV V6-191 3.1L
Engine: Technical Service Bulletins
1990 Chevrolet Lumina APV V6-191 3.1LSECTION Technical Service Bulletins
- Recalls
- Customer Interest
- Engine - Oil Leaks from Crankshaft Rear Main Seal
- Engine - Knock, Piston Scuffing
- Engine - Knocking Noise in Cold Ambient Temperatures
- Engine - Oil Odors
- Fuel - Injector Wires Trapped Under Air Cleaner
- Engine - Miss, Hesitation, or Roughness
- Oil Pressure Gauge - Flutters/Reads High
- Engine, A/T - Shift/Driveability Concerns/MIL ON
- Engine - Oil Leaks From Front Crankshaft Seal
- By Symptom
- Abnormal wear/deterioration
- Customer Interest
- Engine - Oil Leaks from Crankshaft Rear Main Seal
- Engine - Knock, Piston Scuffing
- Engine - Knocking Noise in Cold Ambient Temperatures
- Engine - Oil Odors
- Fuel - Injector Wires Trapped Under Air Cleaner
- Engine - Miss, Hesitation, or Roughness
- Oil Pressure Gauge - Flutters/Reads High
- Engine, A/T - Shift/Driveability Concerns/MIL ON
- Engine - Oil Leaks From Front Crankshaft Seal
- Driveability
- Erratic Operation
- Erratic Shifting
- False instrument warning light/gauges
- Leaks
- Noise
- Odors
- Recalls
- Sticking/Binding
- All Technical Service Bulletins
- Vehicle - Engine And Sub Systems Flushing Info. (CANADA)
- Vehicle - Engine And Sub-Systems Flushing Recommendations
- Engine - Intake Manifold Inspection/Replacement
- Engine - Use of 'Surface Conditioning Disks'
- Engine - Oil Leaks from Crankshaft Rear Main Seal
- Engine - Drive Belt Misalignment Diagnostics
- Engine - Noise/Damage Oil Filter Application Importance
- Engine - Sealant Usage/Procedures
- Engine - AC Delco Remanufactured Engines
- Engine - Surface Conditioning Discs Precautions
- Engines - ACDelco Remanufactured
- Spark Plug - Torque Specification Update
- Engine - Knock, Piston Scuffing
- Engine - Knocking Noise in Cold Ambient Temperatures
- Engine - Oil Odors
- Fuel - Injector Wires Trapped Under Air Cleaner
- Oil Filters - Enhanced Anti-Drainback Valves
- Engine - Miss, Hesitation, or Roughness
- Oil Pressure Gauge - Flutters/Reads High
- Fuel System - Controlled Idle Speed Updated Chart
- Oil Filter Adapter - Service Procedure Revised
- Recall 97V058000: Rear Cradle Retainer Replacement
- Engine - New Prelube Tool
- Engine, A/T - Shift/Driveability Concerns/MIL ON
- Engine - Oil Leaks From Front Crankshaft Seal
- Engine/Fuel System - Oil/Fuel Additive Information
- Engine - GM Dexos 1(R) And 2(R) Oil Specifications
- Engine - GM dexos 1(R) and dexos 2(R) Oil Specifications/Info.
RENDER: 1.0x
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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.