Iv'e just re-read this thread and seen that you also have the knock sensor code coming up - so barr the different rev ranges - our faults are fairly similar. Does yours also hesitate when revving through the regions where the kangarooing occurs ?
I'm going to swap the throttle body next - will let you know.
Have never had a single error code that was not purposefully generated by removing a part. As for Knock I believe I had knock as I was monitoring the knock sensor with an oscilloscope. Without another trace to compare it against I dont know if its normal or not.
Let me know on the throttle body, thats one of my options too, but as Im fully fly-by-wire and it appears to be working then Im hesitating...
So for ease sake its a new fueld pump to ensure the fuel fillter is new as well...
Doc G, how do you know it was an injector originally?
Have you checked the injector signal (oscilliscope)?
The front 2 lambdas are probably white due to ash content in engine oil.
Their readings should be very lively.
The rear lambda should pretty much flatline if all is well (about volt is memory serves).
If there was a fuel pressure problem, I'm sure the management system would throw a lambda code.
I think you probably were on track, but off it new.
Check you wiring about the coils. It is possible wiring damage and EMF from the coils could be interrupting the LT signal to the coils. Again, an oscilliscpoe would be the best thing to check this with.
I lashed up a test rig which appeared to show intermittent operation on one of the injectors, but I couldnt build a test rig easily to run at 2-3 bar, so Im now looking at taking them off again and getting them professionally tested and cleaned. The ECU 7.3.1 seems to be dumber and doesnt throw any errors, even the alfa stealer in Cannes couldnt find a single problem after 3 days analysis!!!!! Luckily for me he was too embarassed to charge me for finding nothing. Signals on LT side of plugs looked okay with oscilloscope, obviously big spike caused by pickup from HT side, but otherwise seemed reasonable to me. If I ever get to the bottom of this problem I will have one hell of a write-up with oscilloscope images and all.
My next step is injector cleaning by a pro, check variable inlet manifold is not split by dismantling, check exhaust manifold is not cracked or split (and fit new exhaust bracket), then its replacement throttle body, tdc sensor, knock sensor and after that new variator-cambelt-camshaftsensor-waterpump which is my last resort due to cost!!!!
Interestingly though I disconnected the variator solenoid (electrical connection) and it behaved somewhat differently, but didnt throw an error code at all. Also, can someone tell me what value their ECU is saying for air temperature in comparison to real air temp as mine wont go below 35C even when its 15C outside and the car is moving.