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 MANUALSCHEVROLET1990LUMINA APV V6-191 3.1LREPAIR AND DIAGNOSISENGINE, COOLING AND EXHAUSTENGINETESTING AND INSPECTIONEXCESSIVE OIL LOSS OR CONSUMPTIONTROUBLESHOOTING
1990 Chevrolet Lumina APV V6-191 3.1L
Troubleshooting
1990 Chevrolet Lumina APV V6-191 3.1LSECTION Troubleshooting
^ External oil leaks. Tighten bolts and/or replace gaskets and seals as necessary.
^ Improper reading of dipstick. Check oil with vehicle on a level surface and allow adequate drain-down time.
^ Continuous high speed driving and/or severe usage such as trailer hauling, will decrease oil mileage.
^ PCV valve malfunctioning.
^ Valve guides and/or valve stem seals worn or omitted. Ream guides and install oversize service valves and/or new valve stem seals.
^ Improper oil viscosity. Use recommended S.A.E. viscosity for prevailing temperatures.
^ Piston rings broken, worn, or not seated. Allow adequate time for rings to seat. Replace broken or worn rings as necessary.
^ Piston improperly installed or misfitted.
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.