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 MANUALSMITSUBISHI1991PRECIS L4-1468CC 1.5L SOHCREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTFUEL DELIVERY AND AIR INDUCTIONTESTING AND INSPECTIONSYMPTOM RELATED DIAGNOSTIC PROCEDURESLACK OF POWER, SLUGGISH
1991 Mitsubishi Precis L4-1468cc 1.5L SOHC
Lack of Power, Sluggish
1991 Mitsubishi Precis L4-1468cc 1.5L SOHCSECTION Lack of Power, Sluggish
***UPDATED BY TSB # 91-11-011, DATED JULY 1991.
Definition: Engine delivers less than expected power. Little or no increase in speed, when accelerator pedal is pushed down part way.
NOTE: A loose crankshaft sprocket (timing belt crank pulley) may cause a loss of power or erratic idle, if these circumstances exist refer to TSB #91-11-011
POSSIBLE CAUSE ACTION
Contaminated fuel Check for water or
excessive alcohol in fuel
Drain fuel tank and add clean fuel
Lead contamination Check for missing fill pipe restrictor
of catalytic converter Replace catalytic converter
Low fuel pressure Check fuel pressure
Proceed to FUEL PUMP
Pinched or collapsed fuel hose/line Repair/replace as required
Throttle valve not fully opening Check accelerator pedal travel
(Floor mat/carpet interference)
Check throttle cable adjustment
Proceed to ADJUSTMENT PROCEDURES
Dirty air filter Clean or replace
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.