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 MANUALSCHEVROLET1986CAVALIER RS, 2D HATCHBACK, 2.8 W, AUTOMATICREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMV6/V8 PFI COMPONENT TESTDIAGNOSTIC MATERIALSDIAGNOSTIC CHARTS
1986 Chevrolet Cavalier RS, 2D Hatchback, 2.8 W, Automatic
Diagnostic Charts
1986 Chevrolet Cavalier RS, 2D Hatchback, 2.8 W, AutomaticSECTION Diagnostic Charts
The diagnostic charts are used to find and repair problems which the on-car diagnostics have found. These charts include:
- Charts which test the reliability of the self-diagnostic system.
- Charts which help fix problems which are "SERVICE ENGINE SOON" light related.
- Charts which test the computerized fuel control system performance.
- Charts which help fix a problem when the on-car diagnostics don't work.
- ENGINE CRANKS BUT WON'T RUN charts. Refer to the appropriate TROUBLE SHOOTING chart in the CEC TESTS W/O CODES article in this section.
- Charts where a stored trouble code leads you to a particular problem. See ECM TROUBLE CODE DEFINITION and DIAGNOSTIC AIDS in the V6/V8 PFI TESTS/CODES article in this section. Charts which are used because the FIELD SERVICE MODE CHECK found a problem.
NOTE:
Although there are many charts connected with computer diagnosis, only 2 charts are needed to prove system is operating properly. Normally, only 3 charts are necessary to find a problem, if one exists.
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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.