I seem to have inadvertently opened up the cutting out issue again! My car has not cut out since I have had it, but it has the earth strap fitted for the fuel pump relay.
For me, I think it's not worth trying to figure out the cause of the cutting out. There are so many advantages of going with a modern ECU, such as:
- Distributorless ignition - solve all the problems of damp in the distributor cap
- Fully mappable ignition, fuelling and boost - more power, better driveability (hopefully)
- Solve all the reliability issues with one stroke (providing you install a new loom)
- More understandable by modern garage equipment/laptops
- Solve the bridged fuel pump relay problem
- Ability to add features such as traction control, boost control per gear, etc.
These are just a few of the advantages I can think of off the top of my head!
I spoke to John at JL Engineering. He recommended that I used the Emerald K6 ECU from Dave Walker. He is able to have looms custom built for the A610 but the cost is quite high. £750 for the ECU and another £750 for the loom. He replaces the entire loom for running the engine and puts the new ECU in the factory location. It uses some of the factory relays, etc...
Having said that, my preference would be to build my own loom. I like the idea of the multi-plug for ease of disconnection between the engine and the car, so I would replicate that, but with a modern connector. I would also use a standard 36-1 trigger wheel and a Ford 6 cylinder coil pack.
If possible I would wire and install my own loom beside the original factory loom and then drive the car up to JL Engineering for final installation and mapping. Alternatively if I can get a base map, I'd consider using that to drive the car (gently) up to him.
I would also use an aftermarket boost solenoid valve and probably a wideband lambda sensor. With a wideband sensor, the ECU can self-optimise the fuelling map (apparently). I'd also look at installing an exhaust gas temperature sensor, which could help with optimising fuelling under boost.
Of course, Adaptronic is another option, as recommended by Chris at EFI parts. I suppose I just have to choose!
By the way, now that I mention the multi-way connector for the wiring to the engine, has anyone investigated this for a potential source of cutting out??