Question about Mitsubishi Passenger
I give a look towards the O2 sensor. When an O2 senor fails the ECU will run the engine rich (better to to this then run lean and burn up valves, in running rich the gas mileage goes bad quick) This condition sounds familiar for O2 sensor failiar.
I hope this may have helped,
Posted on Oct 02, 2009
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Posted on Jan 02, 2017
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The poor performance of the car makes the consumption go up and so we need to check the working of the engine. Check if the fuel contains impurities and specially water. If so this can come up with the pumping when the tank gets empty and produce misfiring, splutter and jerks. So a check on the fuel filter will confirm this as it will be seen, if so remove and clean tank and change the filter. We then come to the fuel pump/the pumping fuel pressure must be determined in this section. You need to have the pump calibrated if the pressure at the injector is low.
Then we must check with the electrics. The spark intensity is most important .Remove all plugs to check gap and condition of plugs. The black plug indication will confirm that the performance is bad whereas a fully fired plug without deposits must be the ideal view. Check the HT coil and the HT wires, if the intensity is bad this must be swapped and checked to confirm. DO NOT CHANGE any part without a confirmation by trying with a replacement from another vehicle or friend. Finally the LT trigger to the coils must be checked be it from the platinum points or an electronic ignition unit. The voltage of the trigger must be high to give the best HT output.
Now use a strobe to check the Timing on the engine. Adjust if needed to correct the timing for a smooth ticking and ideal idle RPM. If there is valve noise make sure that the tappets are set properly so that the valves seat firmly for the best compression. Also check compression of engine if there is imbalance on the engine or reduced power.
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