Possible Ignition Module Fault

[muttley383]

Hi all,

can you please give an opinion on what you think the hiccup is @ 4.36m and 6.41m of the attached log.
It looks to me either distributor or the ignition module.

Log is for a VR V8 commodore.

[VL400]

Hard to tell what will be the problem - but from the log the module has stopped sending ref pulses to the ECU or the ECU has a problem and stopped processing the signal. If the module stopped sending pulses it could be it or the dizzy thats faulty. The ECU did go in to bypass mode while the fault occured so the ECU reacted as it should.

Check all connections are ok, the ign leads are not touching the loom anywhere, the ign module is well grounded etc

[muttley383]

Thanks for the reply.

Should it have thrown a trouble code or was the event to brief?
I am using the original ignition module as an input to an MSD system. So the module should not be stressed due to current flow. Does not mean it has not got some dry/cracked solder joints due to vibration.

[TTVN]

IMO ignition module fault is about 500% most likely item to be causing dropouts like that

[muttley383]

It has been a long time, thought I would post a follow up.

The problem ended up being the distributor. To be more correct, the sensor in the dizzy that sends pulses to the ecm and ignition module.

I first tried an alternate ignition module without fixing the problem. The problem would only occur every 2 or 3 weeks so it was a bit of trial and error to source the root cause.
I replaced the dizzy with a new unit about 6 weeks ago with no sign of the fault re-curing.

[antus]

Thanks for the followup. Always good to hear the solution.