Impco HHI, Руководство по обслуживанию

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POOR FUEL ECONOMY
Checks Action
DEFINITION: Fuel economy, as measured by refueling records, is noticeably lower than expected. Al-
so, the economy is noticeably lower than it was on this vehicle at one time, as previously shown by
refueling records.
Preliminary Checks

Check the air cleaner element ( filter) for dirt or being plugged.

Visually check the vacuum hoses for splits, kinks, and proper connec-
tions.

Check for properly inflated tires.
Check the operators driving habits for the following:

Excessive idling or stop and go driving.

Carrying of very heavy loads.

Rapid acceleration.

Suggest to the owner to fill the fuel tank and to recheck the fuel econ o-
my and/or suggest that a different operator use the equipment and
record the results.
Fuel System Checks

Refer to Gas Fuel System Diagnosis .

Check the fuel system for leakage.
Sensor Checks

Check the MAP sensor.
Ignition System Checks
Remove the plugs and inspect them for the following conditions:

Verify that the spark plugs are the correct type and properly gapped.

Wet plugs.

Cracks.

Wear.

Improper gap.

Burned electrodes.

Heavy deposits.
Check the ignition wires for the following items:

Cracking.

Hardness.

Proper connections.
Cooling System Checks
Check the engine thermostat to see if it is stuck open or for the wrong heat
range.
Additional Check

Check the transmission shift pattern.

Refer to the OEM Transmission Controls section the Service Manual.

Check for dragging brakes.