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[JamesV6CDX]

Soooo

This morning, cold start.

Caught immediately. Ran for about a second or two, and died.

Restarted - engine ran, but sounded rough, like it was misfiring. Touched the gas to give her a gentle rev - instant death, cut out immediately.

Restarted again - purred nicely and idled/revved without issue.

If anything this is certainly making me wonder about the crank sensor.

I have today visually checked/cleaned all of the electrical connections I can find.

At the battery, with a multimeter, it's measuring 12.3 volts. Looking at live data, (engine off) the ECU reports 11.3 volts.

With the hefty omega battery hooked up, the ECU only reports 11.5 volts with the engine off. So I am wondering if, it's normal for it to see that sort of voltage in the ECU, given everything is powered up with the ignition on?

Anyhow given this morning's events I too am not sure about the battery anymore.

I am off to buy a new crank sensor in a tick. I've read failures are common so I will also pick up a cam sensor (it's in stock, and cheap enough) - BUT I'm not going to fit them yet, until this has been discussed a bit more and I'm recommended to do so, based on methodical diagnostics because I don't want to follow the "fit and hope" brigade

As an aside, with engine running, ECU reports about 13.6v.

[henryd]

12.3 Volts is on the low side for a battery off load thats fully charged,normally closer to 12.7 V

[Bigron]

James, just to satisfy MY silly thought, could you connect the ECU directly to the battery? If it makes no difference, cleary my thinking is in error, but you will then be working from a point of knowledge - you can never have too much information (unless listening to the wife....).

Ron.

[Webby the Bear]

12.3 Volts is on the low side for a battery off load thats fully charged,normally closer to 12.7 V

Exactly this.

Whilst the battery may not be the only issue the fact is you have a low performing battery and I'd be putting it on a battery tester to see if it's able to be recharged to full health...if not then you need a new battery.