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, 2.5 HREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMSPARK CONTROL SYSTEMTESTINGFORWARD DELAY VALVE
1987 Jeep Wrangler Base, 2.5 H
Forward Delay Valve
1987 Jeep Wrangler Base, 2.5 HSECTION 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.