alright..diagnostic time!! i recently just replace my cabin wire harness..i had a couple wires fry up on me..so i swapped the whole thing..i drive a 95 hatch...and put a b16a..its a cx engine harness.and a 93 ex cabin harnesss..(ahhah try and follow along) now i slapped everything together and the car started right up..i went to drive it and it shut down on me..my relay would click loud and fast and eventually it would stop and start up again..i diagnosed it...to be the computer...my stock computer i believe its a PO5 starts the car up everytime..but the P30 doesnt..so i bought a p30 on ebay and it was shipped here..i got it tonight..put it in and it doesnt start my car..hmmmmmm? my stock one still starts the car and now even my old p30(the one i said to be bad) so im going back and forth ecu to ecu trying diff.. ones..now each p30 doesnt work..then it does..on and off..works and doesnt works and doesnt..BUT MY P05(STOCK) WORKS EVERY TIME..so im thinking the both p30s are bad..and that kid from japan ripped me off..or i have a wiring problem just the p30s are effected by...sometimes they work and somtimes they dont..but my PO5 works everytime...i hope you guys can help me out ..and this wasnt so confusing..thanks

 

bump come on guys

 

I dont know man that seems like a really tough one... I think that you should just go and get a new car and engine and do the swap all over again... You can do it in my garage.

 

CEL with the P30 when it doesn't start?

when it doesn't work, is the starter spinning the engine or simply no starter action at all?

Guessing right now... it sounds like you have a bad connection some where.
The P05 ignores several signals that the P30 doesn't.
Have you tried a P28? or even a P06? P72?

 

the engine turns over..and somtimes it starts..with both p30s..and the p05 starts it everytime..