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 MANUALSISUZU1985TROOPER II 1.9 A, MSG5LREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCEADJUSTMENTTUNE-UP - 4-CYLADJUSTMENTSIDLE SPEED
1985 Isuzu Trooper II 1.9 A, MSG5L
Idle Speed
1985 Isuzu Trooper II 1.9 A, MSG5LSECTION Idle Speed
- Set parking brake and block drive wheels. Place transmission in Neutral. Be sure engine is at operating temperature, choke open, A/C off (if equipped) and air cleaner installed.
- Disconnect and plug distributor vacuum hose, canister purge line and EGR control hose. Disable idle compensator vacuum line by bending rubber hose.
- Turn throttle (idle) adjusting screw until specified idle RPM is reached. If equipped with A/C, turn to maximum cooling and high blower.
- Open throttle about one-third and let it close to allow speed-up solenoid to reach full travel. Turn solenoid speed screw to reach 850-950 RPM.
IDLE SPEED SPECIFICATIONS
| Application | Idle RPM | |
|---|---|---|
| P'UP | ||
| All Except Federal Man. Trans. | 900 | |
| Federal Man. Trans. | 800 | |
| Trooper II | ||
| Calif. | 900 | |
| Federal | 800 | |
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.