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Richard 7/17/2018

2001 Mitsubishi Mirage ES 4 Cyl 1.80L


losing power and doesnt start at times

car suddenly downshifts hard, temp gauge doesn't run at normal temp ,windows roll up slow and lights are dim. engine size is 1.8l

1 Answer


Jimm 7/18/2018

Several possibilities; worn battery, worn/loose drive belt, worn belt tensioner, worn idler pulley, corroded / loose battery terminals - to list only a few.
Best to have the battery and charging system, including the alternator tested for free, at any local auto parts store.
First step - have the battery and charging system tested; including the alternator - for free - at any local auto parts stores in your area. Next, make sure the battery connections / cables and terminals are OK - clean and tight; with no corrosion build-up - at both ends of each of the positive and negative (ground) cables to and from the battery.

You can clean the battery terminals yourself with an old toothbrush, and paste of baking soda and water mixture.

When the battery and charging system - along with the alternator is tested - be sure to obtain a written, detailed test report; containing the voltage, amperage and test conditions, plus the test results.

With the car off, all lights off - hook the meter probes one to the + terminal of the battery and one to the + wire/cable that you removed.

You must start with a known full charge battery tested after a full charge with a battery hydrometer to test the electrolyte in each cell at 1.25 or higher S.G. (specific gravity). If battery is maintenance-free cut off the three (3) cell cover and inspect the electrolyte charge and level.

With the battery tested and known good, hook up in the car with clean terminals, no grease. A helper may be needed.

With a cold engine, and with a voltmeter at 20 VDC, read the meter as the motor is started. Read the meter as the motor fast idles, read the meter as the idle comes down to normal and finally read the meter as the RPM is upped to 2500.

Expected readings:
After recharging the battery and testing with an hydrometer must have 12.7 V
No hydrometer - get one (auto parts store), battery terminal voltage at least 12.7 VDC
While starting cold motor and battery hooked up, during starting or cranking no less than 10 VDC.

At cold higher idle at least 13V to 13.5 VDC
At warm engine 750 RPM idle at around 13.25 VDC
At 2500 RPM at full voltage of 15 VDC

If all is good, shut the engine off.

With a good multimeter set to 10 A maximum for Amps and test leads correctly placed on meter, with one lead as common and one lead at the amps 10A whole. Remove the + lead from the battery with all the wires/cables. Clean the battery + terminal and the + lead that you disconnected.


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