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 MANUALSJEEP1987COMANCHE BASE, 2.1 BREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMFUEL INJECTION SYSTEM - DIESELTESTINGTURBO BOOST CUT-OUT SWITCH
1987 Jeep Comanche Base, 2.1 B
Turbo Boost Cut-Out Switch
1987 Jeep Comanche Base, 2.1 BSECTION Turbo Boost Cut-Out Switch
- Disconnect hose from test point "A". See Fig 1. Connect a pressure gauge to hose. Start and run engine at 3000 RPM. Record pressure reading. Disconnect gauge and reconnect hose.NOTE: If no pressure is indicated, check turbocharger operation, and for a pinched hose between manifold and turbo boost cut-out switch.
- Disconnect hose from test point "B". See Fig 1. Connect a pressure gauge to hose. Start and run engine at 3000 RPM. Record pressure reading. Pressure reading should be equal to reading at test point "A" in step 1.
- If pressure is okay, turbo boost cut-out switch is operating correctly. If pressure is not okay, and engine coolant temperature is below 239°F (115°C), replace cut-out switch. Disconnect gauge and reconnect hose.
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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.