High Idle

[Craigy]

How come when i start my EP82 GTT from cold it idles fine, then when it gets warmer it idles even higher? what could this be? anyone got any ideas? ive screwed the idle screww right down and still idles quite high!

 

[AdamB]

Coolant temp sensor. Check it's resistance with a multimeter, I don't know the value ranges but I'm sure someone else has the values.

 

[Craigy]

ok i'll check which one is the sensor to check, there is two i think, one will do the guage wont it? and the other will do auto-choke?

 

[weeJohn]

The gauge sensor has only 1 wire, the ecu sensor to check has 2 wires (3 on some Glanzas) but all the other sensors in that area only have 1 wire. The resistance is high when cold and low when warm, I dont know the exact values but I think its about 2000 ohms to about 500 ohms.

It could also be a tps or wax stat fault but you have to start somewhere and I think the sensor is your best bet.

 

[Craigy]

ok thanks John, Also does anyone know what tells the ecu to idle faster when you turn the A/C on, as my starlet doesnt change idle speed when you turn A/C on or off? maybe it thinks that the A/C is on all time and thats whay the idle is so high??

 

[Fizturbo]

If the idle speed wont go up when you turn a/c on then the a/c gas mite of run out

 

[weeJohn]

ok thanks John, Also does anyone know what tells the ecu to idle faster when you turn the A/C on, as my starlet doesnt change idle speed when you turn A/C on or off? maybe it thinks that the A/C is on all time and thats whay the idle is so high??

The A/C only increases it by about 200 revs, but it is controller by the 2 solenoids that are piped off the top of the throttle body and bolted to the bulkhead above the fuel filter.

 

[Craigy]

have you got any pics of the pipe work to them as i may have put the pipes on opposite way round?