S300, no spark, no CEL/MIL

[jun1or]

Been troubleshooting this problem for a week. I rarely ask for help, but I'm stumped here.

I was driving the other day and car suddenly died on 3/4 load at about 4000 rpm, cold engine. No spark, no fuel, check engine light wouldn't even turn off when I turn the ignition to II. No fuel pump priming, nothing. I couldn't even connect to the ecu via Smanager anymore. OK dead ECU is most likely the problem. (previous guy installed the ECU replacement power supply capacitor terribly - too much heat, melted traces. I suspect it finally went)

I had a spare P72 GSR ECU around so I soldered in the pins, transistors, jumpers, etc, put the ECU in the car and voila, no check engine light and I can finally hear the fuel pump prime (didn't before). Upload my .cal, datalog record, try to start and no spark.

Pulled a plug out and checked spark, fail

Per factory manual and/or helmes, I tested and/or replaced:

• Tested coil, ok
  Tried replacement coil, no change
  Tested ignitor, ok
  Tried replacement ignitor, no change
  Tested main relay, ok
  Inspected and tested critical fuses underhood and dash, ok
  Pulled an injector harness off and hooked it up to a spare injector, clicked in my hand on startup, ok
  Bought and installed junkyard distributor, ok
  Cleaned ground on thermostat, ok
  Placed jumper wire from negative battery to a distributor leg, no change
  Tested ignition switch, ok
  The disti is spinning while cranking, no I don't have a broken timing belt. (seen that before)

What's weird is that now the check engine light doesn't come on at all, not even when I turn the ignition on! I did assign an aux input on the S300 to SCS, service connector switch, but I don't think it is related, as this was done years ago.

What am I missing? Bad install of S300 done by me? I'm decent at soldering, but who knows. I welcome all thoughts. Datalog of engine cranking and calabration attached.

Thanks in advance,

Mike

[jun1or]

When reporting any s300 problems, please include:

- the calibration (as an attachment)
See post #1

- a datalog of a problem (as an attachment)
See post #1

- what sort of vehicle you have
91 CRX, USDM B18C1

- what sort of ECU you are using
P06 S300 (died)
P72 S300 (replacement)

- anything about the car which has been modified from stock which may affect the ECU (don't include what sort of rims you have nor stereo etc).
Cams, RC440's, skunk2 IM, nothing major.

- a specific description of the problem
see post #1

Again, thanks.

Mike

[Spunkster]

From help about, what version of software are you using?

[jun1or]

1.5.3.0

I purchased a used virgin obd1 p72 ecu, so I will try that before installing s300 to see if I have spark.

[jun1or]

It was a bad ecu. All is well now.