ek with s300 p28..built ls..cams pistons intake big throttle bottle etc....built for turbo currently stock exhuast to break/waiting for turbo parts. stock injectors/map sensor. ecu recongnizes engine as stock currently. no 02 sensor. its in open loop was going to use wideband instead. but didnt make it that far. no biggie......

heres the problem. car starts. idles fine for 20 sec or so. then just shuts off. like i shut the key off. doesnt studder just shuts off. check engine light comes on but no code and i cant data log.....but then some times i can datalog/no cel. i put a 1.5 ecu and it idles forever perfect but when i drive it it gets way to lean so i aborted that asap. guessing cause a built ls it taking way more air than a stock 1.5


why is my relay clicking???!!! i tried 2 relays all grounds are good as well as fuses, is s300 junk? or is it the computer its in... how can i test it?



also i tried the "bad" s300 ecu in my daily car and it studders and has solid cel but no code. all my pins are good internally checked continuity.. help please n thanks

 

it wont be commen to have another s300 compatable ecu but if possable try s300 in another ecu. i had a bad socceted ecu that gave intermiten problems.

 

What kind of laptop are you using??? is it old and clogged up??? if you within wifi signal shut it down... sometimes if an old computer is being overwhelmed by malware and spyware it can cause no datalogging...

 

bad injector drivers in my old ecu.......put s300 in new ecu now its good

 

The s300 is much, much less reliable than people think. At any rate, I'm glad yours isn't bad, but if your injector drivers fried you clearly don't have enough resistance on your injectors and should invest in a resistor box before you fry the new ECU.