this is my 3rd post and now one has responded maybe someone will now. I got a 97 LS engine In my Honda Civic DX HB I used my stock wiring harness but when I plugged in the LS ECU (p75) it doesnt want to work. But when I plugged in the DX ECU it worked alright. An LS wiring Harness WILL NOT WORK on the DX Does any one know if the honda civic EX with vtec will work with the LS ECU PLEASE HELP!!!

 

OK, you need to list way more details then that. This makes no sense.

a '97 engine is OBD-II.

A P75 ECU is OBD-I or II depending on year.

The "DX" ECU and stock harness is OBD-0, not to mention it's DPFI.

What exacly are you trying to do? Run an OBD-II engine with an OBD-I/II computer with a DPFI OBD-0 harness?

 

I have a 1998 honda civic DX witch is OBD2 and a 1997 Acura Integra LS engine witch is OBD2 to I Used the DX wiring harness but when I plug in the ls ECU it doest work but when I plug in the DX ECU its works alright not good but alright Do you need to know anything else? Do you think the EX Wiring harness will work?

 

Wrong section, this is pre-92.

I'm guessing the engine will spin, but not fire with the P75. Is the ECU known to be good? The EX harness shouldn't be needed, since it only has a couple extra provisions for the VTEC system which isn't even needed on a B18B. Is it throwing any codes?

 

It turns on but when I go to drive it, it wont go pass 5mph So the EX wouldnt work eaither?

 

check the codes...and try the ecu in someone else's car to make sure it works or not...let us know after that and we will try and help out as much as possible... good luck!

 

The EX wiring harness is nearly identical, so no, it won't magically fix the problem.

Once again, I'll ask: Is the P75 known to be good?

 

how about u just go by all the matching equipment or is that just too easy of a solution? correct me if i'm wrong but every if u have a 97 LS integgy motor, shouldn't u use the same exact wiring harness with the adaptor kit?

~1989 Honda CRX's spank 2004 Dodge Neon SXT's

 

no not really keebler... the ex harness should work fine..the engine id bod2 in a obd2 car... so there is no problem with the harness or components... it is probablly most likely the computer... check it and make sure it works

 

So to properly check if the ECU is operational he would need to find an Integra with the same transmission as his Civic, auto/manual.

Yes or No.
In other words do Ecu's from autos work on manual vehicles.