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 MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTESTING AND INSPECTIONSYMPTOM RELATED DIAGNOSTIC PROCEDURESHESITATION/SAG/STUMBLE
1991 Jeep Cherokee 2WD L4-150 2.5L VIN P MFI
Hesitation/Sag/Stumble
1991 Jeep Cherokee 2WD L4-150 2.5L VIN P MFISECTION Hesitation/Sag/Stumble
SYMPTOM DESCRIPTION:
Momentary lack of response when the accelerator is pushed down. Can occur at any speed. Usually most severe from a stop or initial take off. Engine may stall if condition is bad enough.
SYSTEM OR COMPONENT TO CHECK ACTION
COMPUTER INPUTS/OUTPUTS CHECK: - THROTTLE POSITION SENSOR (TPS):
Check for binding or sticking. Voltage should
increase at a steady rate as throttle is moved
toward Wide Open Throttle (WOT).
- MANIFOLD ABSOLUTE PRESSURE SENSOR
(MAP): Sensor response and accuracy.
FUEL CHECK: - FUEL PRESSURE:
- WATER CONTAMINATED FUEL
IGNITION CHECK: - For defective plug wires.
- For fouled spark plugs.
- Open ignition system ground.
- Ignition timing.
EMISSIONS CHECK: - EGR SYSTEM: Valve operation.
- EVAPORATIVE SYSTEM: Cannister purge system
operation.
NOTE: Refer to EMISSION CONTROLS for testing procedures.
ENGINE CHECK: - Generator output voltage. Repair, if less
than 9 or greater than 16 volts.
Momentary lack of response when the accelerator is pushed down. Can occur at any speed. Usually most severe from a stop or initial take off. Engine may stall if condition is bad enough.
SYSTEM OR COMPONENT TO CHECK ACTION
COMPUTER INPUTS/OUTPUTS CHECK: - THROTTLE POSITION SENSOR (TPS):
Check for binding or sticking. Voltage should
increase at a steady rate as throttle is moved
toward Wide Open Throttle (WOT).
- MANIFOLD ABSOLUTE PRESSURE SENSOR
(MAP): Sensor response and accuracy.
FUEL CHECK: - FUEL PRESSURE:
- WATER CONTAMINATED FUEL
IGNITION CHECK: - For defective plug wires.
- For fouled spark plugs.
- Open ignition system ground.
- Ignition timing.
EMISSIONS CHECK: - EGR SYSTEM: Valve operation.
- EVAPORATIVE SYSTEM: Cannister purge system
operation.
NOTE: Refer to EMISSION CONTROLS for testing procedures.
ENGINE CHECK: - Generator output voltage. Repair, if less
than 9 or greater than 16 volts.
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.