Engine stall under heavy electrical load : where to look ?

[Huw Powell]

Seconded very firmly.  The EFI system may not be well-powered.

On 3/27/2012 5:48 PM, Tony Hoffman wrote:
> Also, check the voltage going to the ECU when the fan comes on. Best with
> an O-scope, but a good DMM will also work. You want to see the ECU voltage
> relative to it's ground, so start with probing those two terminals. If it
> drops significantly when the fan comes on, there's your problem.