Thread: Newly installed 3.9 EFI won't fire - I have run a search.

I'm lead to belive the crank angle sensor is one of the must have inputs.
No signal, no start is what I've read.

Originally Posted by alien

I'm lead to belive the crank angle sensor is one of the must have inputs.
No signal, no start is what I've read.

There is no crank angle sensor on the 14cux system. All the ECU gets is a rotation signal from the negative side of the ignition coil. This wire is white with a black stripe. There will be a resistor between that wire and the ECU where the wire becomes white with a blue stripe. You can test for coil firing at the ECU with a LED tester at that wire colour. Then use the LED tester to look for pulsing at the injector wires, they should switch to near zero during engine rotation. The ECU fires two banks of four injectors. The two injector wires are yellow/ blue stripe and yellow/white stripe from memory.

Thanks mate, I should clarify that all the sensors on the engine are still connected to the ECU as they have always been, so if that was there before, then it still will be. The engine loom is exactly as it was in the Disco, it is only the other bits away from the engine that have been grafted to the Rangie loom.

Cheers - Gav.

14CUX does not have a crank angle sensor.

Have you removed the distributor at any stage. if so it is very possible to replace it with the rotor pointing 180degrees out. Put your thumb into no1 when the rotor is pointing to it and see if any pressure when turning the motor.
This will prevent starting.LOL

Regards Philip A

I think I still have some info on the ECU at home. I will check when I get home from work.

See if the info in this link helps, it gives the ecu inputs if you don't all ready have them. Some light reading for you.

Rover 14CUX Hot Wire Mass Flow EFI: Service and Troubleshooting

Fuel injection

Originally Posted by PhilipA

14CUX does not have a crank angle sensor.

Have you removed the distributor at any stage. if so it is very possible to replace it with the rotor pointing 180degrees out. Put your thumb into no1 when the rotor is pointing to it and see if any pressure when turning the motor.
This will prevent starting.LOL

Regards Philip A

Thanks Phil, but I haven't touched anything on the engine. Just bolted it in and put the loom back on. I picked up everything I thought I needed but I guess I'm missing something.

Originally Posted by Landover

I think I still have some info on the ECU at home. I will check when I get home from work.

See if the info in this link helps, it gives the ecu inputs if you don't all ready have them. Some light reading for you.

Rover 14CUX Hot Wire Mass Flow EFI: Service and Troubleshooting

Fuel injection

Thanks Dave, that first one is what I worked off when I did the loom. I have just found a troubleshooting guide on LR4x4 and I think I may have found an issue.

I don't have the engine speed signal wire and the 6.8K ohm resistor running from the coil. I only put the coil and amp in temporarily as I haven't worked out exactly where it is going to live yet. I can't find the wire in the loom, but I will run a temp wire in the morning and see what happens.

Would this stop it from starting?

To answer my last question, YES it will.. Just ran a wire from the negative of the coil, through 3 x 22K resistors in parallel (they are all I had) - needed 6.8K so pretty close - to pin 39 of the ECU. Cranked it again, and away she went.

Runs pretty sweet too. Dropped down to a nice idle within about 20 seconds, so I'm well chuffed.

Will stick a bucket in the front where the front seat need to go tomorrow and go for a drive around the block I think...

Thanks for all your input - Gav.