Checks
| Action
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DEFINITION: The engine delivers less than expected power. There is little or
no increase in speed when partially applying the accelerator pedal.
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Preliminary Checks
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| | Important:: Do not compare the power output of the vehicle
while operating on LPG to a vehicle operating on petrol. Both fuels have different
drive feel characteristics.
|
| • | Verify the customers concern by comparing the power output of a similarly equipped
known good vehicle to the suspect vehicle. |
| • | Inspect the air filter for correct type and for dirt or restriction. |
| • | Test the transmission for correct shift pattern and downshift operation. |
| • | Inspect the LPG ECM for the correct LPG calibration. Program the LPG ECM
if necessary. |
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Fuel System Checks
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Ignition System Checks
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| | Important:: A higher secondary ignition voltage is required
to operate the vehicle on LPG than on petrol.
|
| • | Test for correct secondary ignition system voltage output using only the combustible
gas detector Spark Tester. |
| | Important:: More timing advance is required to operate
the vehicle on LPG than on petrol.
|
| • | Test for correct operation of the Knock Sensor system. |
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Exhaust System Checks
| Inspect the exhaust system for a possible restriction.
Restrictions can include the following:
| • | A failed catalytic converter |
| • | Damaged or collapsed pipes |
| • | An internally failed muffler - may show signs of heat distress |
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Engine Mechanical Checks
| Test for correct engine operation by checking for the following:
| • | Correct engine compression |
| • | Correct engine valve timing |
| • | Worn or incorrect camshafts |
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Additional Checks
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| • | Test for correct A/C operation. A/C that is on all the time may cause
this symptom. |
| • | Test for correct transmission torque converter clutch (TCC) operation,
if equipped. |
| • | Test for correct generator operation. |
| • | Inspect for correct operation of the accelerator pedal. A stretched accelerator
cable may cause this symptom. |
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