ECU swap questions - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Silverstreek · 03-24-2009, 10:52 PM

ok, trying to figure this out. i bought another ecu recently that i plan to send off to have nistune installed on. i just got the ecu in the mail yesterday and want to be sure it's a good ecu. so i just went out, disconnected the harness going into my stock ecu and plugged it into the used ecu i bought. connect the battery, fired the car up and it ran like i had cams in it. kinda looked like it was a little bit rich (smelled like it too), but mainly just ran rough. disconnected the battery, disconnected the harness from the used ecu and reconnected it to my stock ecu, reconnected the battery, fired the car up and it runs just fine.

i'm just wondering if the ecu needs to be all bolted down in the car in it's location? maybe there's a ground or something there and it needs to be bolted down, cause i didn't bolt it down? it's a 92 ka24de 5spd and the ecu i bought is supposed to be from a 93 ka24de 5spd (even though lookin at the p/n shows it's from 91). the ecu case doesn't look damaged or anything, don't hear anything rattling around inside. really the only difference i see is the green and white sticker at the corner has a different number than my stock ecu (mine has a 30 on it and the used one has 24 on it). i know a auto ecu works with a 5spd car, but not visa versa, so that shouldn't matter. do the regulations, as in if it's a federal or california car, matter for anything? my ecu p/n says my ecu is a california reg, whereas this used one says federal reg.

i'm gonna go back out and take my stock ecu out and bolt this used one down like the stock ecu is now and try it again, but thought i'd ask and maybe have an answer if i try again and it still doesn't work.

Silverstreek · 03-25-2009, 08:29 PM

well, i took my stock ecu out and put in this used one, bolted it down like the factory one was and it still runs like ass. put my ecu back in and runs just fine. so guess that idea's out the window.
not throwing a cel or anything either, didn't mention that but figured i'd better.

Silverstreek · 03-26-2009, 10:07 PM

no ideas at all? i'm about to buy another one, would kinda like to not have to do that if i can figure out what's up with this one.

stelth213 · 06-20-2012, 11:55 PM

Quote:

Originally Posted by Silverstreek

ok, trying to figure this out. i bought another ecu recently that i plan to send off to have nistune installed on. i just got the ecu in the mail yesterday and want to be sure it's a good ecu. so i just went out, disconnected the harness going into my stock ecu and plugged it into the used ecu i bought. connect the battery, fired the car up and it ran like i had cams in it. kinda looked like it was a little bit rich (smelled like it too), but mainly just ran rough. disconnected the battery, disconnected the harness from the used ecu and reconnected it to my stock ecu, reconnected the battery, fired the car up and it runs just fine.

i'm just wondering if the ecu needs to be all bolted down in the car in it's location? maybe there's a ground or something there and it needs to be bolted down, cause i didn't bolt it down? it's a 92 ka24de 5spd and the ecu i bought is supposed to be from a 93 ka24de 5spd (even though lookin at the p/n shows it's from 91). the ecu case doesn't look damaged or anything, don't hear anything rattling around inside. really the only difference i see is the green and white sticker at the corner has a different number than my stock ecu (mine has a 30 on it and the used one has 24 on it). i know a auto ecu works with a 5spd car, but not visa versa, so that shouldn't matter. do the regulations, as in if it's a federal or california car, matter for anything? my ecu p/n says my ecu is a california reg, whereas this used one says federal reg.

i'm gonna go back out and take my stock ecu out and bolt this used one down like the stock ecu is now and try it again, but thought i'd ask and maybe have an answer if i try again and it still doesn't work.

the same thing is happening to me... i had a ep ecu on m 92de n jst swaped it with a 24 witch is ment for a 91de and runs horrible... i was wondering if it had to do with the 91de have bigger cams

stelth213 · 06-21-2012, 01:33 AM

does any one know how to fix this??

03-24-2009, 10:52 PM	#1
Silverstreek Zilvia Member Join Date: Aug 2007 Location: Kadena AB, Okinawa Japan Age: 43 Posts: 163 Trader Rating: (4) Rides Gallery: Silverstreek Feedback Score: 4 reviews	ECU swap questions ok, trying to figure this out. i bought another ecu recently that i plan to send off to have nistune installed on. i just got the ecu in the mail yesterday and want to be sure it's a good ecu. so i just went out, disconnected the harness going into my stock ecu and plugged it into the used ecu i bought. connect the battery, fired the car up and it ran like i had cams in it. kinda looked like it was a little bit rich (smelled like it too), but mainly just ran rough. disconnected the battery, disconnected the harness from the used ecu and reconnected it to my stock ecu, reconnected the battery, fired the car up and it runs just fine. i'm just wondering if the ecu needs to be all bolted down in the car in it's location? maybe there's a ground or something there and it needs to be bolted down, cause i didn't bolt it down? it's a 92 ka24de 5spd and the ecu i bought is supposed to be from a 93 ka24de 5spd (even though lookin at the p/n shows it's from 91). the ecu case doesn't look damaged or anything, don't hear anything rattling around inside. really the only difference i see is the green and white sticker at the corner has a different number than my stock ecu (mine has a 30 on it and the used one has 24 on it). i know a auto ecu works with a 5spd car, but not visa versa, so that shouldn't matter. do the regulations, as in if it's a federal or california car, matter for anything? my ecu p/n says my ecu is a california reg, whereas this used one says federal reg. i'm gonna go back out and take my stock ecu out and bolt this used one down like the stock ecu is now and try it again, but thought i'd ask and maybe have an answer if i try again and it still doesn't work. __________________ 1993 Nissan Skyline GT-R, 326 Crystal White 2003 Nissan Presage

03-26-2009, 10:07 PM	#3
Silverstreek Zilvia Member Join Date: Aug 2007 Location: Kadena AB, Okinawa Japan Age: 43 Posts: 163 Trader Rating: (4) Rides Gallery: Silverstreek Feedback Score: 4 reviews	no ideas at all? i'm about to buy another one, would kinda like to not have to do that if i can figure out what's up with this one. __________________ 1993 Nissan Skyline GT-R, 326 Crystal White 2003 Nissan Presage

03-25-2009, 08:29 PM	#2
Silverstreek Zilvia Member Join Date: Aug 2007 Location: Kadena AB, Okinawa Japan Age: 43 Posts: 163 Trader Rating: (4) Rides Gallery: Silverstreek Feedback Score: 4 reviews	well, i took my stock ecu out and put in this used one, bolted it down like the factory one was and it still runs like ass. put my ecu back in and runs just fine. so guess that idea's out the window. not throwing a cel or anything either, didn't mention that but figured i'd better.

06-21-2012, 01:33 AM	#5
stelth213 Join Date: Jun 2012 Location: hollywood Posts: 14 Trader Rating: (0) Feedback Score: 0 reviews	does any one know how to fix this??