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 LAREDO, 4.2 C, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMSPARK CONTROL SYSTEMTESTINGFORWARD DELAY VALVE
1987 Jeep Wrangler Laredo, 4.2 C, Standard
Forward Delay Valve
1987 Jeep Wrangler Laredo, 4.2 C, StandardSECTION Forward Delay Valve
- Connect external vacuum source to port on Black (or Red) side of delay valve. Connect vacuum gauge to port on colored side of valve.
- With elapsed time device in view and a constant 10 in. Hg vacuum applied, note time required for gauge pointer to move from 0-8 in. Hg.
- If valve fails to meet time limits, replace valve. If valve meets specifications, install so that Black (or Red) side is toward vacuum source.
FORWARD DELAY VALVE TIME LIMITS (1)
| Valve Color | Min. Time | Max Time | ||
|---|---|---|---|---|
| Black/Purple | 3.2 | 4.8 | ||
| Black/Gray | 8 | 12 | ||
| Black/Brown | 16 | 24 | ||
| Black/Orange | 1.5 | 2.5 | ||
| Black/White | 50 | 77 | ||
| Black/Yellow | 80 | 120 | ||
| Black/Green | 160 | 240 | ||
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RENDER: 1.0x
NO RELATED
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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.