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 MANUALSJEEP1991CHEROKEE 2WD L4-150 2.5L VIN P MFIREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTIGNITION SYSTEMIGNITION TIMINGADJUSTMENTS
1991 Jeep Cherokee 2WD L4-150 2.5L VIN P MFI
Ignition Timing: Adjustments
1991 Jeep Cherokee 2WD L4-150 2.5L VIN P MFISECTION Adjustments
Ignition timing is electronically controlled by the Powertrain Control Module (PCM) and is NOT adjustable.
Adjusting the distributor will NOT change the ignition timing. It will change the fuel system synchronization and can cause driveability complaints. Refer to TSB's if the vehicle exhibits surging, bucking, intermittent missing or other driveability symptoms.
If you are installing the distributor for the first time (I.E. during and engine rebuild), refer to Distributor/Service and Repair for distributor installation procedures.
Adjusting the distributor will NOT change the ignition timing. It will change the fuel system synchronization and can cause driveability complaints. Refer to TSB's if the vehicle exhibits surging, bucking, intermittent missing or other driveability symptoms.
If you are installing the distributor for the first time (I.E. during and engine rebuild), refer to Distributor/Service and Repair for distributor installation procedures.
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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.