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 MANUALSJEEP1986CHEROKEE BASE, 4D UTILITY, 2.5 H, 4WD, STANDARD, AX4REPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCEADJUSTMENTTUNE-UP - V6ADJUSTMENTSIDLE MIXTUREPROPANE ENRICHMENT PROCEDURE - FEDERAL MODELS
1986 Jeep Cherokee Base, 4D Utility, 2.5 H, 4WD, Standard, AX4
Propane Enrichment Procedure - Federal Models
1986 Jeep Cherokee Base, 4D Utility, 2.5 H, 4WD, Standard, AX4SECTION Propane Enrichment Procedure - Federal Models
- Engine must be at normal operating temperature. Turn A/C off, if equipped. Set parking brake and block wheels. If equipped with vacuum parking brake release, disconnect and plug hose at brake.
- Disconnect and plug vacuum advance and canister purge hoses. Connect tachometer to engine. Adjust timing and reconnect vacuum advance hose. Set idle speed to specification.
- Disconnect crankcase ventilation tube from air cleaner. Using Propane Enrichment Adapter (J-26911), insert hose with rubber stopper (from propane valve) into air cleaner snorkel. Ensure propane cartridge is vertical.
- With engine idling in Drive (auto. trans.) or Neutral (man. trans.), open propane supply control valve slowly. Engine speed will increase. Add propane until engine speed begins to drop from over-richness. Note maximum enriched idle RPM.
- Maximum enriched idle RPM is idle RPM plus propane enrichment RPM. Engine speed should increase above normal idle by amount specified. If so, mixture is correct. Proceed to step 9).
- If speed is incorrect, remove idle mixture screw plug. See MIXTURE SCREW PLUG REMOVAL in this article. Lightly seat mixture screw and then back out 3 turns.
- Place transmission in Drive (auto. trans.) or Neutral (man. trans.). Back out screw slowly until maximum idle speed is reached. Set maximum enriched idle speed.
- Turn mixture screw in (clockwise) 1/8 turn at a time, until idle speed is correct. Recheck maximum enriched speed with propane. If incorrect, repeat step 7).
- Turn ignition off. Remove propane supply, air cleaner and carburetor. Remove carburetor adjuster. Seal mixture screw access hole with RTV sealant. Install carburetor and air cleaner. Connect crankcase ventilation tube and reconnect all vacuum hoses. Adjust idle speed.
PROPANE MIXTURE ADJUSTMENT
| Application | RPM |
|---|---|
| Federal | 20 |
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.