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 (Twin Spark)Irregular engine idle speed
IRREGULAR ENGINE IDLE SPEED
TEST G
| TEST PROCEDURE | RESULTS | CORRECTIVE ACTION | |
|---|---|---|---|
| G1 | CHECK IDLE SPEED ACTUATOR | OK NOT OK | Proceed to phase G2 Follow the procedure indicated in the ELECTRICAL - ELECTRONIC DIAGNOSIS manual |
| - Check that the idle speed actuator is working correctly - see ELECTRICAL - ELECTRONIC DIAGNOSIS manual | |||
| G2 | CHECK THROTTLE VALVE POTENTIOMETER | OK NOT OK | Proceed to phase G3 Replace the potentiometer |
| - Check that the potentiometer is working correctly - see GROUP 04 - CHECKING FUNCTION OF THROTTLE VALVE POTENTIOMETER | |||
| G3 | CHECK AIR-FLOW METER | OK NOT OK | Proceed to phase G4 Replace or clean the meter |
| - Check that the tabs move freely without bending. Check that there are no traces of dirt or rubbing inside | |||
| G4 | CHECK FUEL PRESSURE | OK NOT OK | Proceed to phase G5 Check that the fuel filter, pump and pressure regulator are working correctly and replace any faulty parts |
| - Check the pressure and sealing of the fuel supply circuit - see GROUP 04 - FUEL CIRCUIT PRESSURE AND SEALING CHECK | |||
(CONTINUES)
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
Links open Amazon search results in a new tab. As an Amazon Associate I earn from qualifying purchases.