No spark, no fuel prime. please help!

[skidhoe]

Hey Guys, so ive been changing batteries abit as i have 2 which are quite tempermental some times will work sometimes wont. sparks a little when connecting the terminals, have done this multiple times but starts first pop every time. then the other day i went to start it, and i couldnt hear the fuel pump prime so i checked spark as well and sure enough i have no spark. also everytime i turn it off of acc there is a really weird almost croaking noise coming from where the ecu is. could i have fried my ecu or the relay? has anyone ever encountered this problem? please help! its an s15 sr20det in a jdm s14 zenki.

Thanks guys

[skidhoe]

anyone?! really stuck

[ultimateirving]

Whats ur voltage at?
And why do you switch between batteries? If one is tempermental it sounds like an internal battery issue and should be swapped for a known good battery.

[skidhoe]

not to sure, i have replaced it for a decent battery now and the above is what has happened so im stuck trying to figure out what damage i have done, it has no problem cranking

[skidhoe]

Anyone else have any ideas?? :picardfp:

[ultimateirving]

Sorry noone else has replied, Your description is decent but doesnt leave us much to go off of..
have you tested anything? What is your mechanical experience..

Honestly I would open up the ECU and inspect for burn marks... if it looks clean, borrow a friends ecu and try it.

[skidhoe]

thanks for the reply. im ok with mechanical stuff, i completed the engine conversion but the wiring was completed by a professional auto sparky. basically the bottom line is, it drove fine, then i went to start the car i did not hear the fuel pump prime i tested the coils for spark and i have none. when i turn the car onto acc, then back to the off position i hear a weird creaking noise coming from that area so im presuming it is either the ecu or the relay i am just stuck as to which one it is and i cant get hold of either items for borrowing or purchase them cheaply!

[Driftwire]

Pull the ECU and turn the key to on right before it cranks and see if the lights in the ECU are on (there is a window in the back) if no light. Your ecu is probably shot.

[ultimateirving]

Well start by pulling out the ECU it is easy..
Carefully open it up and inspect the circuitry for any burn marks where electricity may have cause a short. At least that will give you something to go off.