wierd problem s13 with rb20

[fast_s13]

ok so the first ten or fifteen times the car started it would shut off just fine..now when you shut it off something is back feeding and keeping it running for a few more seconds... i unhooked the green ign reley and it will start up and shut off just fine.... any one know what could cause this

[Vkoslak]

When mine did that, it was because I accidentally wired the rear window defogger into the ign.

[fast_s13]

every thing is wired correctly..this is the second rb swap i have done

[fast_s13]

nobody?

[jrb92se]

preignition or run on; the timing is effed

[fast_s13]

it is backfeeding powering the ecu after they key is turned off

[jrb92se]

your timing is advanced to much you need to retard the timing , also does it run hot? sometimes if an engine is too hot or has spots on the cyl head this will happen ,could be carbon build up too , id get someone to check your timing first