I have a 1990 hatchback that had a D16z6 out of a 92 civic. I put a odb0 d15b2 into the car and used the wiring harness that came with the D15. I didn't change the ecu though. the car fires but won't run for more than a second. Whats the easiest way to make this car run, or the cheapest way. thanks

 

Alright. Lets start from the top.

The car is wired up OBD1 with a OBD1 ecu and you put an OBD0 engine harness in it with a OBDO dizzy and the map sensor is probably wired up wrong.

You have a couple of options to make it run.
1) You can convert back to OBDO completely. You would need to remove the Jumper harness or repin the ecu plugs back to OBDO if it was hardwired. But even if just a jumper harness was used, you will have to swap the wires for the TDC crank sensor and rewire the map sensor back to OBDO. Then you would also need a pm5 ecu.

2) Keep the car OBDI. Since its a non-vtec engine you will need the p06 ecu and a non-vtec OBDI dizzy. You will also need to wire up the map sensor correctly, as the stock engine harness has the firewall mounted map rather than the throttlebody mounted.

If you could provide a little more information about the set-up that would be helpful.

 

i totally agree dude!!

 

the car is hardwired, and i want to do the first option you suggested, will the plugs fit into the odb0 ecu?? and what do you need to do to swap the wires for the map sensor and tdc crank sensor. thanks for help

 

If the car is hardwired, then you have quite a bit of wiring ahead of you. You will need to rewire each plug because the OBDI plugs do not fit in a OBDO ecu. Once that is complete, the car should start up and run with a OBDO ecu (pm5).

Your best bet would be to go to a junkyard and find another dx civic and taking the dash harness or just the ecu plugs (with atleast 6 inches of wire) so you can redo all of the wiring back to stock.

It will take a couple of hours to do, but as long as you take your time and make sure that all of the connections are secure and shrink wrapped/taped you will be fine. I highly recommend soldering all of your connections, especially because the wiring is being done to something so vital.

Here is a link to a free download for honda factory manuals. Download the ef manual and use the wiring diagram for the ecu plugs to help you along your way.
http://hondatech.info/downloads/Auto/Manuals/Civic

 

thanks alot ill do that then

 

what would be different if i used a harnes out of a 89 crx si

 

Since the engine harness for the si is for a MPFI car, you would need to convert to MPFI to use it. However, the car is already MPFI because of the OBDI conversion. To use that harness you would need the Si intake manifold, Si dizzy, injector resistor box and si ecu (pm6). The intake manifold from the z6 would work, and would not require any rewiring for the map sensor if used.


Look in the FAQ for links to information about MPFI swaps.

 

Any particular reason you are downgrading?

 

i meant could i use the dash harness out of an si, cuz thats all i can get ahold of around here