I only seem to half an engine working???

Wow, awesome post with lots of information to help begin the diagnostic process. Nice.

Certainly sounds as though you are correct that the right bank is not functioning. Since you've confirmed that the fuel pump is working that tends to point toward an engine control problem on the right side. Interesting that you're not seeing a check engine light. Do both check engine and slow down lamps illuminate when you turn the key to the run position without starting the car?

There are a ton of potential causes for this problem. Somewhere in this section of the forum is a post with a Motronics diagnostic guide attached. That same info might well be in the manual as well-- my memory is junk. But in any case you'd be well served to have copies of both on hand as you work to sort out the problem. Both can be downloaded at no charge from links found here.

There are a number of ways to begin chasing the problem and I'm sure some of the owners who have faced similar issues will offer their input. In the meantime, one thing you could do would be to pull at least one spark plug from the right bank not too terribly long after you've run the engine (but after it has cooled enough to be comfortable to work on and reduce the risk of removing the threads in the head). If the plug is wet that tells you that the injectors are opening, and that the problem is likely a faulty ignition component, so you can shortcut some of the more general diagnostic steps. If the plug is dry that opens the door to a number of other potential causes.

I'm on my phone without easy access to a manual so that's all I've got for you off the top of my head. It's very likely something simple, but knowing what lights you see with the key in the on position and whether the right plugs are wet or dry would be helpful in creating a diagnostic plan.

Best of luck! You're on the right track so far and the help you'll find here is first rate, so hopefully you'll have it figured out in short order.

 

What you can check is starting the car in the dark, and look for sparks near the wires.
Most cars do lose some sparks , and if you see them on both the left and right side you know that at least you have a spark tru the wires on the not-running side of the engine.

 

Do both CELs light up when the key is turned to on prior to starting? I just had the same issue and it looks to be a bad ECU.

 

Swap ecu's and see what happens.

 

Bad fuel pump on one side? Check fuses

 

These cars suffer from bad connections in the footwell fuse box
I took mine out cleaned it extremely well and got rid of a lot of gremlins

 

As time permits, you might want to try to get the check engine and slow down lights working properly. The check engine lights could be a big help in diagnosing future problems and the slow down lights could prevent a fire.

Glad it's running on all eight again.