14CUX EFI Control; Unit

[blaze_away]

I have a suspected defunct EFI Control Unit. Everything is working OK (Fuel pump, Ignition system etc) except the 14CUX Unit is sending either No or at best sporadic signals to the injectors, and hence the engine will not start.

The unit I have is an AMR2175 on my 93 4.0

Two questions

Must I replace with a AMR2175 or could I use a later version eg AMR3242

Anyone got one for sale ?

[blitzracing]

The part number does not matter, they are all compatable post mid 1991, and there will be a date stamp on the unit. The case fixing vary, but that does not matter on a TVR. Its not a fault id expect from the ECU however, as you have two seperate circuits, one for each side of the V8, so you would only loose both sides if the 12 volts dissapeared from the common feed wire, and this is controlled from the main relay, that is a more likely culprit. As for second hand ones there are plenty floating around on Ebay from Range Rovers and Landrover V8's, that seem to sell for around £50-70. All you then need to do is open up your TVR one and swap the Fuel map chip across. Dont be tempted by "TVR" ones for £350 +, its nothing more than a standard 14CUX with the TVR chip.

[blitzracing]

http://cgi.ebay.co.uk/Range-Rover-Classic-3-9-v8-1...

[blaze_away]

Cheers for the confirmation, I thought that might be the case.

Will change out the relay first

[shpub]

The only other thing to be careful off is that not all the ECUs have a socket for the eprom chip and have it soldered in. This means some careful work is needed to unsolder the chip and fit a socket.

[Simon says]

shpub said:

The only other thing to be careful off is that not all the ECUs have a socket for the eprom chip and have it soldered in. This means some careful work is needed to unsolder the chip and fit a socket.

That's true and I know Mark/Blitz is well aware of this but must have slipped his mind shame on you Mark ..

[blaze_away]

I've been fortunate then as mine just unplugs

[blaze_away]

I've been fortunate then as mine just unplugs

[spend]

Thats the point... All the TVR ones do, LR etc may or may not....

[blaze_away]

ok understand now, thanks

[blitzracing]

Simon says said:

shpub said:

The only other thing to be careful off is that not all the ECUs have a socket for the eprom chip and have it soldered in. This means some careful work is needed to unsolder the chip and fit a socket.

That's true and I know Mark/Blitz is well aware of this but must have slipped his mind shame on you Mark ..

Blame it on old age, it works for me...

BTW if the replacement ECU has a plastic cover over the Eprom its not obvious how it comes off, but if you grip it in a pair of pliers across the top half way down and compress it, it will release the clips around the Eprom socket so it can be lifted off- you don't need it. Don't try levering it off you will damage the PCB.

[blaze_away]

Great help folk's, thank you so much.

I have been told there's a Landrover breakers near Earlswood Lakes (near Solihull) so I'm of there today to see if i can find them.