Excessive fuel consumption
- Make
- Fiat
- Model
- Multipla Factory Service Manual
- Year
- 1998–2010
- Section
- Consumption /leaks/ wear › Excessive fuel consumption
EXCESSIVE FUEL CONSUMPTION
The engine seems to be working normally, but the fuel consumption is higher than ever before for the vehicle.
When the engine is set to METHANE mode using the appropriate selector, the engine does not run for as long as indicated
The fuel consumption figures in the technical documentation for the vehicle have been defined during the course of homologation tests in accordance with directive 93/116/CE. These tests simulate an urban route and an "average" extra-urban route and therefore they may not be indicative because fuel consumption depends greatly on the style of driving.
| Results of the tests | ||||
| 0 | PRELIMINARY CHECKS | All OK | Problems encountered | Operation |
|---|---|---|---|---|
Check the condition of the air filter Check the state of the spark plugs | Move on to Step 1 1 | Filter element dirty or damaged | Replace the filter element Op. | |
| Spark plugs dirty or damaged | Replace the spark plugs Op. | |||
| 1 | CHECK USING DIAGNOSTIC EQUIPMENT | All OK | Problems encountered | Operation |
Connect the diagnostic test equipment (Examiner or other instruments) to the diagnostic socket. Check:
| Move on to Step 2 1 | Error detected in the control unit | Continue following the instructions for the diagnostic equipment | |
| No communication with the control unit | Restore the connection between the engine management control unit and the diagnostic connector (See E5030 GESTIONE ELETTRONICA MOTORI BENZINA ). | |||
| 2 | INJECTOR CHECK | All OK | Problems encountered | Operation |
| With the diagnostic equipment (Examiner or other instruments) carry out the active diagnosis of the injectors | Move on to Step 3 1 | Injector connection faulty | Repair the connection for the injectors with the control unit, (See E5030 GESTIONE ELETTRONICA MOTORI BENZINA ). | |
| Injectors faulty | Replace the injectors Op. | |||
| 4 | TIMING CHECK | All OK | Problems encountered | Operation |
| Check the correct engine timing | Move on to Step 5 1 | Timing not correct | Restore the correct timing for the engine Op. | |
| 4 | TIMING CHECK | All OK | Problems encountered | Operation |
| Check the correct engine timing | Move on to Step 5 1 | Timing not correct | Restore the correct timing for the engine Op. | |
| 5 | AIR CIRCUIT CHECK | All OK | Problems encountered | Operation |
Check:
| Move on to Step 6 1 | Circuit component damaged | Replace the component (see Assembly 1048A) | |
| 6 | CHECK ON CORRECT OPERATION | All OK | Problems encountered | Operation |
| Check that the fault is no longer present | End of diagnosis | Fault persists | Search for the fault starting with another symptom | |
The engine seems to be working normally, but the fuel consumption is higher than ever before for the vehicle.
The fuel consumption figures in the technical documentation for the vehicle have been defined during the course of homologation tests in accordance with directive 93/116/CE. These tests simulate an urban route and an "average" extra-urban route and therefore they may not be indicative because fuel consumption depends greatly on the style of driving.
| Results of the tests | ||||
| 1 | CHECK FOR LEAKS | All OK | Problems encountered | Operation |
|---|---|---|---|---|
| Check visually for any fuel leaks from: tank, fuel filler, multifunction valve, etc. | Move on to Step 2 1 | Leaks detected | Eliminate leaks and/or replace defective components (see Assembly 1040A) | |
| 2 | FUEL FILTER CHECK | All OK | Problems encountered | Operation |
| Check fuel filter operation | Move on to Step 3 1 | Presence of water, petrol, paraffin or dirt detected | Clean tank pipes and replace filter element Op. | |
| 3 | AIR CIRCUIT CHECK | All OK | Problems encountered | Operation |
Check the following, in order:
| Move on to Step 4 1 | Filter dirty or partly blocked | Replace the air filter Op. | |
| Circuit component damaged | Replace component (see Assembly 1048A) | |||
| 4 | CHECK USING DIAGNOSTIC EQUIPMENT | All OK | Problems encountered | Operation |
Connect the diagnostic test equipment (Examiner or other instruments) to the diagnostic socket. Check:
| Move on to Step 5 1 | Error detected in the control unit | Continue following the instructions for the diagnostic equipment | |
| No communication with the control unit | Restore the connection between the engine management control unit and the diagnostic connector See | |||
| 5 | EXHAUST PIPE CHECK | All OK | Problems encountered | Operation |
| Check for any obstructions in the exhaust pipe | Move on to Step 6 1 | Exhaust pipe blocked | Replace the component involved (see Assembly 1076B) | |
| 6 | VALVE CLEARANCE CHECK | All OK | Problems encountered | Operation |
Check correct valve tappet clearance Op. | Move on to Step 7 1 | Clearance not correct | Restore correct clearance for valves Op. | |
| 7 | TIMING CHECK | All OK | Problems encountered | Operation |
| Check correct engine timing. | Move on to Step 8 1 | Timing not correct | Restore the correct timing for the engine Op. | |
| 8 | CYLINDER COMPRESSION CHECK | All OK | Problems encountered | Operation |
Carry out cylinder compression test Op. | Move on to Step 9 1 | Compression values not correct | Restore the correct cylinder compression, checking, for example, the seal for the injectors Op. and possibly for the cylinders.) | |
| 9 | CHECK ON CORRECT OPERATION | All OK | Problems encountered | Operation |
| Check that the fault is no longer present | End of diagnosis | Fault persists | Search for the fault starting with another symptom | |
Parts & tools for this job For 1998 Fiat Multipla
- TOOLTorque wrenchSearch: 3/8 inch torque wrench
- TOOLSocket setSearch: socket set metric
- BOOKHaynes manualSearch: Haynes manual Fiat Multipla
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