[Guest]

Guys,

I keep hearing a low about the stepper motor and problems with it not being adjusted properly. A number of people have told me they have noticed a big difference in the car after getting it set correctly. But what is it? Where is it? Does anyone know or is this just rubbish?

Cheers,

Dave

 

[Guest]

The stepper motor is also known as the ISC - idle stabilisation control valve. - it controls the amount of air bypassing the throttle which allows the car to idle smoothly.

I believe you need a MUT II to reset it properly for evo 4 onwards.

On older Mitsubishis they have a habit of screwing up - leading to idle surge - wildy fluctuating idle many times a second. This occurs when the coils that drive the motor go open circuit and the ecu can no longer maintain the correct idle - the ISC then has what can be best described as 'a fit'.

 

[Guest]

Lightspeed

In your experience is there anything that can be done with the ISC motor once it goes south?

 

[Guest]

Hi Chunky,I was having a idle problem,removed my Spec-R relocation kit ,problem went away!

 

[Guest]

Lightspeed

Thanks for the answer. My car idles perfectly, therefore is it safe to assume that that everything is working fine and best left alone?

Dave

 

[Guest]

If it is working - leave it alone - if a problem arises they should pick it up at service - a big problem - you'll soon be ####ed with the crazy idle - everyone at the lights thinks you're spoiling for a race.

Chunky - if it has gone south check it with some 1.5V batteries - test is in www.vfaq.com ???
Also check wiring loom back to ecu. Easy to get from scrappers - but I think their life is limited - wait for Co-ordsport 50% off sale and live with it is my advice.

I have no need on my VR4 any more as it has just put a rod through the block - F**K!!!!!!!
Happened while the garage were trying to fix a jumped cambelt. I'm scrapping it - anyone want any bits?????? Time for a reliable Golf Gti!