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 MANAGEMENTEMISSION CONTROL SYSTEMSTESTING AND INSPECTIONSYMPTOM RELATED DIAGNOSTIC PROCEDURESLACK OF POWER
1991 Jeep Cherokee 2WD L4-150 2.5L VIN P MFI
Lack of Power
1991 Jeep Cherokee 2WD L4-150 2.5L VIN P MFISECTION Lack of Power
Engine delivers less than expected power. Little or no increase in speed on slight acceleration.
POSSIBLE CAUSE ACTION
Hot air tube not connected Check inlet air temperature system (TAC)
to air cleaner - air damper in "Testing Procedures" in Emissions
door binding or not opening
EGR malfunction Check EGR system in "Testing
Procedures" in Emissions
Spark timing - excessive retard Check Spark Controls in "Testing
Procedures" in Emissions
Initial timing incorrect Check Ignition Timing in "Adjustment
Procedures" in Emissions
Restricted exhaust Check Catalytic Converter in
"Testing Procedures" in Emissions
Poor or contaminated fuel Recommend higher grade fuel
RENDER: 1.0x
NO RELATED
Recommended Tools & Savings
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.