CPR Worked fine, now ignition issue

[ruinedxjake]

Hello,

B16 head, b18 block, 1.95L sleeved. Got the car all put together up and running. I have verified the wiring previously, and got the car running with no issues from the CPR.

Today I took it around the block to test the brakes. I got home, turned it off. And when trying to start again, the IGN light fires the first 2 seconds or so, car almost starts, but stops firing (injector duty goes away and no ignition light). I get a code 16 OBD1 (injector code), which previously has been caused by the distributor when I left the two-wire plug unplugged to the dizzy. Looked at smanager data, confirmed injectors stop firing plus no ignition after about 2 seconds of cranking it. Considering I have done no electrical work and the car drove fine before, I find it hard to believe it's electrical.

Coils were warm but I don't think they were hot per se.

Also sync light works fine. Does this sound like a distributor issue?

[Spunkster]

Post calibration and a datalog of it trying to start showing the issue.

[ruinedxjake]

Post calibration and a datalog of it trying to start showing the issue.

Absolutely.

I failed to save the datalog that day but I logged today and the symptoms were different today. Ignition worked fine (CPR light and sync light flashed as designed), but as soon as ignition took to approx 27 degrees advance, the injectors stop working. When Ignition graph goes back to -4, the injectors start cycling again.

[ruinedxjake]

Okay, my OBD-2 GSR Distributor finally arrived (genuine honda) from the UK to USA.

Installing OBD2 distributors to an OBD1 ecu is easy with a $10 amazon adapter. Also, you don't have to cannibalize the distributor wiring and can keep it unmolested by modifying the adapter instead (these things are generally online for $400-700 right now).

Without any settings modified to the tune installed, and no wiring modifications, the car fired up, warmed up, idled fine and all, no changes just an OEM genuine (expensive) honda distributor.

One new issue though: the CPR IGN light stays costant on at all times! If the CPR power light is on, so is IGN. Car ran perfectly fine though. Was there any other wire to the distributor I needed to cut because it is OBD 2 vice OBD1?

So to summarize, OBD1 B16 engine, OBD1 distributor originally. Now Honda OBD2 distributor with adapter harness and the IGN light stays lit. There have been 3 stages of issues so far:

1. Before I started this forum, everything worked okay, no dist. error.
2. Later on, Sometimes there would be a dist error on Smanager with the aftermarket distributor. But normally no error and it ran fine! Eventually car would not start and it seemed to be a distributor problem which prevented injectors from firing.
3. New OEM Honda Distributor, no distributor error. Car running perfectly now. BUT the IGN light stays lit at all times. It does not seem to brighten or dim while you'd expect the light to be flashing as normally when starting and running. The Sync light seemingly behaves normally at all times, and back then with the old distributor it would light up every 4 times the IGN light lit up. It still behaves that way.

[ruinedxjake]

Data log for my previous comment with the IGN light lit at all times on the CPR box.

[Spunkster]

Where do you have the ign wire connected from the CPR to the ECU?

[ruinedxjake]

The ICM which is either A21 or A22 (without it in front of me I don't remember), is cut near the ECU such that the distributor ICM signal does not reach the ECU, and is soldered to the CPR ICM wire (yellow/red).

Same with ALTC except A16, soldered to purple wire for CPR ALTC wire.

[ruinedxjake]

Where do you have the ign wire connected from the CPR to the ECU?

After looking at the installation instructions very carefully, I guess it could be pretty important whether A22 or A21 was used, not sure. The diagram and the text instructions both contradict eachother on the hondata installation instructions. The image directs A21 to be used, and the text says A22. Does it matter which is used, and should the other be cut?

I will check tonight which is the pin I used for the install, but I think I left the other one untouched.

[Spunkster]

Either can be used, but is one still connected to the original location?

[ruinedxjake]

Either can be used, but is one still connected to the original location?

It is possible. Should that one be cut?

[ruinedxjake]

A22 was diverted to communicate between ECU and CPR as designed.

A21 was left connected between distributor and ECU. A21 is now cut, and the system is working as designed.

I think if the instructions clearly directed bypassing one to the CPR and cutting the other for both the S300 as well as AEM EMS the confusion wouldn't exist. The current instructions say just for AEM EMS to disconnect the other wire, but don't say anything for s300.

[ruinedxjake]

I realize the reason the indications changed between distributors. By leaving the ICM wire plugged into the new distributor coil (so as to leave the distributor unmolested), A21 was then re-connected between the new distributor and ECU. Step 7 alleviates this with the install by directing removal of this wire, but I can either cut A21 near the ECU, or just cut the ICM wire on the OBD-2-to-1 adapter.

Either way she's working fine now.

[ruinedxjake]

Either can be used, but is one still connected to the original location?

Hello again,

same issue persists. Unfortunately the OEM honda distributor started the car once a while back when I said it worked, but after that start, it hasn't started since and the issue persists.

I got a different socketed ECU to elimited the ECU as the source. The S300 board and ECU look good. OBD-1 code 16 is no longer a code so that's good. But IGN error persists regardless of OEM or aftermarket distributor. When it ran the one time with the OEM distributor, IGN error was not there.

Datalog attached. I noticed the dist. error, rev limiter, and ign cut signals were on after cranking the car for a few seconds. I looked at the rev limiter settings, increased to 13000 RPM and changed it from IGN cut to fuel cut only. After that, the datalog showed rev limit still in, dist. error in, and no ign cut signal like it had previously.

Something seems to be cutting fuel with the rev limit coming in. Any way to disable it on startup?

[Spunkster]

Will it run on just the new distributor without the CPR?

[ruinedxjake]

That's the next thing I'm going to need to do is convert it back to normal distributor. This is too much electrical to be going back and forth so hopefully this works and I can say it was the CPR kit