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Re: Just purchased 91 CRX DX need some advice!!
The TPS wires are the two on the outside of the plug... there are three in a line, change the left and right ones with each other as you're looking at it.. you really can't screw this up.
You'll need to change the pinouts of two wires at the ECU for the injectors, to run 4 instead of 2, and you'll need to wire in some extra pinouts for the Cylinder Position Sensor, which is part of the MPFI system, and tells each injector when to fire. Easiest way to do this is to keep the plug off your DPFI dizzy, depin all the wires from it, and one by one, put the wires from your MPFI dizzy into it, so they match up with the ones that were already there. You will have two extra wires, these two, you need to find a two pin plug, so you can mount them, and another plug that you can run down to the ECU that will match it.
So, what you should end up with is a dizzy with several wires in one plug, and 2 in another, and a plug that matches the 2pin that you can blend into your chassis harness, with pigtails on it. (wire ends)
Yes, if you get another 92-95 injector, you won't have to wire in a resistor box, but the wiring becomes somewhat different... you'll have to figure out the injector wiring from a walkthrough, and just omit the part about the injector resistor box.
Keep in mind, that if you come across one, even from an accord, (older model) you can/should use it, even if you're using saturated injectors.. it won't hurt them, it will just make it so they won't pump quite as much fuel, since they will never peak. Believe me, You'll still never run lean, at least not if you're not touching anything else on the motor yet.
The ECU you want is PM6, that will keep you OBD-0. There are a few alternatives that you could use, but some don't work correctly, others will require some rewiring, and still won't work correctly, etc.
If you're not running Vtec, it's not smart to use a Vtec ECU... some guys say it's still better b/c the ignition/fuel maps change at the Vtec event, and "when that happens, I can smoke anything" sorry guys, the only smoking you're doing is the unburnt fuel and carbon exiting your exhaust pipe.
If you \DO\ have Vtec, (if foosh finds you a Y8 or Z6) run the Vtec ECU, and if you wanna play w/ the Vtec system then, add a Vtec controller, or chip the ECU and get Crome or Hondata to reprogram the curves.
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