Low Idle Speed

[voguev8]

Hi,

Yesterday my speedo stopped working. I switched off and restarted and speedo started working again but ever since noticed my idle speed drops to almost/complete stall.

If you wait at a junction in gear (Auto) then after a few seconds the revs rise back to 600-700. If you go into N or P then rise back to 600-700 almost straight away I have reverted to left foot braking to keep the revs up to stop revs dropping right away. ( I have plugged into code reader but nothing stored). Any ideas ?  I read somewhere if Battery disconnected then sometimes this happens but I have not disconnected mine. I wonder if the speedo not working for a moment is linked?

Thanks

[BIGD]

Hi

Not sure about all the problems but I know you get a low idle when it needs a service? Has it been serviced recently?

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[voguev8]

Hi, yes changed oil/air filter last week

[voguev8]

Hi - Got the engine light on today and code read as PO502 (Vehicle Speed Sensor) Circuit Low. Any Thoughts Thanks

[savage bulldogs]

Vehicle speed sensor is near the gearbox oil dip stick (on manuals) check the plug for corrosion on the terminals and any breaks in the insulation in the wires leading to the sensor .

If it's not broke .....upgrade it 😊

[voguev8]

Thanks, Is it in the same area on a Auto, as I cannot seem to find it.

[savage bulldogs]

I'm unsure as I've never worked on a auto . on the pre 00 impreza it's a on the same side as the dipstick but a bit further back (black plug in this pic)

On the o4 sti 6 speed it's located closer to the dip stick .

On the classic manuals there's only 3 electronic things attached to the box .... earth , reverse sensors (black n white plugs) and the speed sensor.

Sorry I couldn't be of much help

If it's not broke .....upgrade it 😊