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 MANUALSJEEP1987WRANGLER BASE, 4.2 C, AUTOMATICREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEM4.2L FEEDBACK CARBURETOR TESTINGSYSTEM TEST CHARTSTEST CHARTS MENU
1987 Jeep Wrangler Base, 4.2 C, Automatic
Test Charts Menu
1987 Jeep Wrangler Base, 4.2 C, AutomaticSECTION Test Charts Menu
SYSTEM TEST CHARTS
| Chart No. | Test |
|---|---|
| No. 1 | Operational Test |
| No. 2 | Initialization Test |
| No. 3 | Open Loop Switch Test |
| No. 4 | Closed Loop Operational Test |
| No. 5 | Electronic Ignition Retard Test |
| No. 6 | Oxygen Sensor and Closed Loop Test |
| No. 7 | "Downstream" Solenoid Test |
| No. 8 | "Upstream" Solenoid Test |
| No. 9 | Idle Speed Control System Test |
| No. 10 | Sole-Vac Vacuum Switching Solenoid Test |
| No. 11 | Sole-Vac Idle Speed Relay Test |
| No. 12 | Basic Engine Test |
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.