Hi everyone,
I decided to change my turbo timer on the weekend and install an ARK design STB and used a HKS adapter harness to wire it in, after wiring it all up I started the car turned the key back to acc and the timer counted down a shut the engine off as it should all seemed well.
I then tried again but turned the key off to remove the key and at this point the starter motor engaged... I double checked all the wiring and earths which was all wired as it should be but for some reason I can not turn the ignition off completely whilst the turbo timer is active or the starter motor will engage.
 
Whilst trying to work out the problem I googled the fault and found a few posts from people on the GT starlet forums having the same problem and another MR2 owner yet so far have not come across anyone finding a solution to the problem.
 
I am curious if anyone else here has ever come across the same problem and what they found?
 

Yep - this can happen on the MR2. I had the same issue when I changed the Alarm/immobiliser.
After 7 years of ownership I ended up installing a relay to disengage the start motor when the turbo timer was running. You just wire it in underneath the steering column.
 
Some people call this an 'anti-grind' circuit if you want to do more searching.
 
This was the only solution I found.

Hi Pete
 
Thanks for your help, I will have to look into the anti-grind circuit.
 
I found some relay diagrams for starter kill circuits from which I understand is the same as an anti-grind circuit is this similar to what you did?
http://www.the12volt.com/relays/page2.asp
 
 
Any idea what causes the problem to start with?