Benito89

Hello I have a 1993 Honda Del sol "s" with a 1997 Gs-r swapped in. I know I may not be on the right forums but My questions are, as far as i believe, vehice specific. My questions are:

Can I use an OBD1 Gs-R integra underdash wire harness in place of the OBD1 Honda del sol underdash wire harness? I was told all the OBD1 wire harness' for all Honda and Acura were a two piece design...

Does anybody have a link to where I can find an OBD1 Honda Del sol or OB1 Acura Integra Gs-R Underdash wireharness? (I've looked on craiglist and ebay with no results)

Could anybody give me a list of names the underdash wire harness carries? I know Underdash Wire harness and I've Heard AC/PS Power Underdash wire harness...

Thank you to all of you who can give me some good advice.

delsolo95

the engine harness connects to the shock tower harness. the under dash harness is one piece which everything under the dash to the front of the car ie headlights, corner lights, fuse box, windshield motor etc...

look on ebay or craigslist.

delsol92

Use an eg si under dash

94EG8

It's much easier to just run the wires for vtec, knock and IABs from the shock tower plug back to the ECU, GS-R harness *may* also differ in such places as where the door harnesses connect, headlight and a few other other things.

Benito89

According to the following link, I have my car all set up with the obd2a engine harness as well as an obd1 p72 Ecu and obd2a p72 Ecu on the side... But in the link it doesn't clarify what kind of obd1 under dash wire harness to use,

http://www.ff-squad.com/technet/hybrid.92-95.obd2.htm

94EG8

Normally you just keep whatever underdash harness the car came with, it's very labor intensive to change an underdash harness, it requires pulling the dash, heater core, A/C evaportator core if you have A/C (which also requires refilling the system when you're done) pedals, battery tray, steering column and a few other things.

Benito89

None of the above is a problem, so I'm to assume the link is referring to the Honda del sol Underdash? Would I be able to use an OBD1 Gsr Underdash instead?

94EG8

The closest harness you will find to a perfect match will be from a '94 - '95 Del Sol Vtec.

Benito89

So the set up in the end I would have is a OBD2A engine wire harness connected at the shock tower to a OBD1 94-95 Honda del sol Underdash wire harness? What would I have to rewire using the 94-96 Underdash harness? (Regarding sensors and what not)

NVturbo

Why in the first place would you need to mess with the dash wire harness...?? Makes no sense to do so just for a swap.

94EG8

Using a Del Sol VTEC underdash harness you'd have to add the wires for the IABs (assuming you're keeping the stock GS-R manifold and using an ECU that supports it. If using a Del Sol Si harness you'll need to do that along with wire the knock sensor. If using a Del Sol S harness you'll need to wire the above along with vtec.

Benito89

Because...I have to rev to more than 3K rpm to get a decent acceleration, and when the car warms up it almost dies from how shitty it runs, so I checked for codes and I got a CODE 10, which I ended replacing the AIT and the O2 sensors twice. When that didn't solve the problem I continued down the rapair flowchart to checking the circuit, which led me to following the sensor through the firewall and to the ECU, where I discovered some slightly confusing wiring. And so no I just decided to replace the Underdash engine harness (because the del sol has a two piece harness, and there's no need to replace an engine harness that's good) so I can get rid of the complicated wiring and clear that persistent CODE 10. The following pictures are of P72 ECU:
From my AIT there are two wires a BLU/BLK and a converted to a green and a BLU/YLLW converted to a blue. The green wire goes into D17 (INTAKE AIR BYPASS CNTRL. SOL. VALUE) and the blue wire is just hanging there soldered to a thin exposed wire spliced to A26 (LG-1 Logic Ground)

NVturbo

so....did someone do a hack job at the ECU?

Benito89

Negative only a minor tune from a previous turbo set up. Just a straight swap as far as anything goes.