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[Cav9_4]

Just read codes on my sister's Astra ('96 1.6 petrol) come up with code 0505 which according to booklet is Idle speed stepper motor/Idle air regulator,can this be cleaned or will it need replacing?...Many thanks...Wayne

[TheBoy]

thats the icv...

[Dazzler]

Clean and lube as normal

[Cav9_4]

Thanks TB/Dazzler....try and get it done now....inbetween showers...rain showers that is!

[Marks DTM Calib]

No...its not an idle valve.....I suspect its the C16NZ engine which is a single point injection setup (Multec?) with a throttle body, bloody huge injector and a small bypass channel for the idle function.

The stepper motor is mounted on the front of the throttle body and held by two torx screws, remove it and give it a dam good clean and a light lube (peel back the rubber boot).....if you re-connect it, every time the ignition is turned on and off it should operate (no need to start the car) as a little test.

Also give the throttle body a dam good clean and the orrafice into which the stepper motor fits.

[Cav9_4]

Hi Mark and thanks ...your'e right it is the C16NZ  SPI engine in at the moment (raining AGAIN)...but hopefully try and get it done...Thanks again....Wayne

[familyman]

No...its not an idle valve.....I suspect its the C16NZ engine which is a single point injection setup (Multec?) with a throttle body, bloody huge injector and a small bypass channel for the idle function.

The stepper motor is mounted on the front of the throttle body and held by two torx screws, remove it and give it a dam good clean and a light lube (peel back the rubber boot).....if you re-connect it, every time the ignition is turned on and off it should operate (no need to start the car) as a little test.

Also give the throttle body a dam good clean and the orrafice into which the stepper motor fits.

Just a note check around the throttle body for a label 'cause some have a coating so you mustn't use carb cleaner or other solvent on the TB just wipe with a rag the best you can  If its not to late now