Irregular engine idle speed
- Make
- Alfa Romeo
- Model
- 155 Factory Service Manual
- Year
- 1992–1998
- Section
- Irregular engine idle speed › Irregular engine idle speed
Fuel system (V6)Irregular engine idle speed
IRREGULAR ENGINE IDLE SPEED
TEST G
| TEST PROCEDURE | RESULTS | CORRECTIVE ACTION |
|---|---|---|
| G5 CHECK FOR LEAKAGE OF AIR | OK NOT OK |
Proceed to phase G6 Replace the faulty components |
| - Check: • that air is not escaping from the circuit. Cover the connections along the pipes downstream of the airflow meter with soap solution. With the engine at idle speed check that the solution is not sucked in by the engine |
||
| G6 CHECK CYLINDER COMPRESSION | OK NOT OK |
Proceed to phase G7 Clean the affected parts |
| - Check cylinder compression - see GROUP 00 - CHECKING CYLINDER COMPRESSION | ||
| G7 CHECK CONTROL UNIT |
NOT OK
|
Replace the control unit |
| - Check that the MOTRONIC M1.7 control unit is working properly (by checking the vehicle using another control unit) as the idle speed control logic could by faulty |
End of test G
Parts & tools for this job For 1992 Alfa Romeo 155
- PARTEngine gasket setSearch: Alfa Romeo 155 1992 engine gasket set
- TOOLTorque wrenchSearch: 3/8 inch torque wrench
- TOOLFeeler gauge setSearch: feeler gauge set
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