I currently drive a '90 hatch with a '95 D16Z6 installed. Originally I listened to everyone and pulled the intake and replaced it with a '91 Si for the mini-me swap after doing the dpfi to mpfi swap. I used a '91 dizzy and ecu and the car ran great. Over 20k miles on it since the swap.

However, it was also a little weak and having to drive 65 miles each way to work with a weak car takes it's toll. So, finally, I got a P28 ecu and a dizzy (TD42U) that is supposed to be the right one. The ecu came from a manual car like mine so there should be no problems. I spent a week tracing down the wires and getting all the info I needed to change the wiring to OBD 1. Then I did the change.

Now I'm getting a cel 9 code.....CYP sensor. I'm not positive the dizzy is good/bad since I got it used, however, I can't find another one to try swapping at the moment. After messing with the grounds I was able to get rid of the cel 9, but only to get 2 more codes, cel 4 and cel 8 (crank angle and TDC). I went back and decided to rewire the dizzy all the way to the ecu using an 8 conductor, 4 pair twisted, shielded comm cable. I repinned the dizzy harness plug and landed the shield on the same brown/black wire that the original dizzy shield was landed on (B2 on the ecu). The dizzy end shield I tapped off and didn't land. I noticed the O2 sensor wire shield is also on the same brown/black wire at the ecu as well.

After starting, I got the same problem as before, cel 9. On a lark I decided to drive it down the road. She pulled harder than before and I was pretty happy even with the cel light on. I ran it up to 90 on the highway and came home. At the first stop light, it began to idle very poor and I couldn't rev hard at all or it would sputter. Nursing it, I made it home and rechecked the cel code. Now I also have cel 4 (crank angle sensor) and cel 9 (CYP sensor).

Does anyone know of any way to solve this problem? Am I on the wrong ground on the ecu (B2)? Any help would be greatly appreciated or else I'm going to have to go back to the original mini-me setup and I don't look forward to rewiring the ecu all over again. Thanks!

 

it may just be the distributor. check the resistance on each reluctor inside the dist.

 

Did that.....464 ohms across the CYP (orng and white)......457 ohms across the crank angle (blue/ylw and blue/green).....and 456 ohms across the TDC (orng/blue and white/blue) wires. The rpm signal (ylw/green) reads 4.5k ohms to ground. None of the signals in the distributor read to ground other than the rpm.

I can't find anywhere that says how much resistance I'm supposed to be reading.....are these readings low? Using a Fluke 87 btw, so I can't blame the equipment.

Thanks for the help!

 

When I had a code 9, I just replaced the distributer and it was gone.

 

LOL....you can't imagine how badly I wish I had one right now just to try it....

 

Oh my......I didn't really find the problem, but it seems to have disappeared. I tried every possible configuration of wires going to the dizzy until I couldn't even get the engine to fire. Slowly I worked my way back to the exact starting place where I began and VIOLA! it worked without any engine lights. All I can think is a loose connection in the dizzy plug. I also found a spot where the O2 sensor ground was still on the brown/black ground wire and I moved that.....however, that was early on during all my wire swaps so that could have had something to do with it.

Thanks everyone for your replies, I appreciate them!!