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 DIAGNOSISPOWERTRAIN MANAGEMENTFUEL DELIVERY AND AIR INDUCTIONTECHNICAL SERVICE BULLETINS
1990 Chevrolet Lumina APV V6-191 3.1L
Fuel Delivery and Air Induction: Technical Service Bulletins
1990 Chevrolet Lumina APV V6-191 3.1LSECTION Technical Service Bulletins
- Customer Interest
- By Symptom
- All Technical Service Bulletins
- Vehicle - Engine And Sub Systems Flushing Info. (CANADA)
- Vehicle - Engine And Sub-Systems Flushing Recommendations
- Engine - THIS BULLETIN HAS BEEN CANCELED
- Fuel System - TOP TIER Detergent Gasoline
- Fuel System - GM Fuel System Treatment PLUS(R) Info.
- Fuel System - Fuel Injector Maintenance Cleaning
- Fuel System - TOP TIER Detergent Gasoline (Canada)
- Engine/Fuel System - Oil/Fuel Additive Information
- Fuel System - E85 Fuel Usage Precaution
- Engine, A/T - Shift/Driveability Concerns/MIL ON
- Fuel System - Controlled Idle Speed Updated Chart
- Fuel - How Fuel Economy Is Determined
- Fuel System - Factors That Affect Economy/Mileage
- Fuels - Effect of Volatility on Driveability
- Tools - Introduction Of The Fuel Injector Tester
- Fuel - Injector Wires Trapped Under Air Cleaner
- Tools - Duel Fuel Injector Tester
- Fuel Tank - Clunk Noise on Acceleration/Deceleration
- Fuel Gauge - Poor Mileage Range
- Fuel Tank - Thud/Clunk Noise Between 3/4 and Full
- Fuel - Reformulated/Oxygenated Gasolines
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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.