Tuscan Non-Starting

[UncleDave]

I've dropped a post on Facebook about this so apologies if anyone has seen it already - but good old PH is the wealth of knowledge

I know it's a pain in the arse to diagnose remotely but just wondered if anyone has any ideas/suggestions.

Symptoms were:

- Last few months or so it would start and run fine, then cut out once red hot (literally after an hour or more of driving). It would 'kangaroo' for a few minutes before it eventually died - almost like the fuel or spark was being totally cut for a split second.

- Eventually it would die completely and not restart until it's cooled.

- Now it seems the issue has progressed and it won't start at all - even from completely cold! Fuel pump primes ok, engine turns and starts for a second then just cuts out (attached scope of 2 attempted starts).

It's has already had:
New Fuel Pump, Relay and Filter
New Coil Pack
Big fat earth lead from battery to engine to try and rule that out.
100A Fuses seem to be fine
Recently changed plugs and leads.
Starter is fine.

• Just* noticed a Lambda Sensor flash red on for a split second but surely that wouldn't cause the car not to start totally?

I did notice that both sensors were around 0.9V, then upon starting Cyl 456 would shoot up to 1.5V and 123 stays around 0.9V - but both sensors still seem to "react" similarly on the scope. I'd just change the lambda sensors too but I just can't understand how the hell they'd cause the car not to start at all - and I've already thrown enough parts at it it'd be easier to buy a new car



Thanks in advance!

[UncleDave]

S6PNJ said:

Sorry, can't really help other than to suggest looking for a dry joint (solder) somewhere, maybe in the ecu or pin connections as if it only happens when warm, it could be something expanding (less likely to be air / fuel as you can rule that out through diagnostics etc.
Where on FB have you posted it? I'm in the Tuscan group and can't see it there - is there another group I'm not seeing?
https://www.facebook.com/groups/828469707180573/

It's there a few days ago (3d) It'd just so boring it's probably been pushed down the algorithm

Appreciate that! Starting to wonder if it is ECU related now to be honest....