Defiantly a challenge!
Duncan did check the sensor outputs on his laptop and all was well.
It's defo something I've done as was running before it came off the road.

Does seem like a wiring problem, yes.
I have downloaded wiring diagrams and a lot of other info from here

http://www.northursalia.com/techdocs/pdf/pdf.html
http://www.northursalia.com/modifica...ng/wiring.html

Went to my local impreza breakers today and picked up all the relays inside and out which made no difference. Dale also lent me another immobiliser set to try, which unfortunately made no difference. Also changed the ignition switch on the back of the ignition barrel incase that was playing up.
However I noticed something strange, if I unplug the immobiliser completely and turn it over it still primes, cranks and sparks at the end of cranking???
Dale is coming out Tuesday night all going well for a look and to try his Subaru diagnostic computer.
Top bloke is dale @
http://www.imprezabreakers.co.uk/index.htm

I've checked most of the wiring the best I can but I'm no auto electrician by any means.
All I can do is keep going over what I've done with a fine tooth comb, but it's getting rather time consuming and agrivating now to the point where I'm happy to pay someone else to sort (within reason with cost) or even break it up!

Reading some of the PDFs I downloaded it says As I've had the throttle body apart to paint outside, clean and polish inside have I disturbed the throttle position sensor which is causing a problem? I did put the sensor in the exact same position within reason

 

did you check this?

 

Yep defo not done that! The injectors have thicker wires than the cam sensor wires and the cam sensor was giving a reading as was the crank sensor when Duncan plugged it in.

 

Voltage was dropping very significantly whilst cranking so it is possible that faulty starter motor with a large current loss in it which is taking away needed voltage for the coilpack to work. We were getting sparks while my booster pack was connected and voltage high. And enough for it to try to start on occasion.

Cam crank and tps were all giving correct signals, showing rpm while cranking and moving normally.

 

Cheers Duncan. I'll try another starter at some point too.

anyone got any thoughts on this? The key light isn't on on the dash but neither is it when the immobiliser is completely unplugged?
Wish I could find a wiring diagram on the factory immobiliser so I could test the wiring but there's no mention of it on any of the wiring diagrams I've seen.

 

Found immobiliser diagram and diagnosis at last!
Thought I'd post it up for anybody else having trouble
http://www.spooledupracing.com/downl...mmobilizer.pdf
Something else to look at over weekend.

 

 

Duncan, YOU ARE THE MAN!!!!!!!!
Turns out it was the starter. Worked perfectly ok but was drawing too much voltage from the battery. How random!

Will be seeing you soon for remap Duncan!

 

big spark in one go? sounds like the coil ( amplifier) either that or poss leads all had it, are they routed to correct plugs. is the battery discharged ? ive found 2 scoobs i had both had flat battery after just a wk of standing

hope u get it sorted soon!!

 

All sorted bud. Turned out to be a dodgy starter motor, even though it worked fine when it was cranking over it was drawing too much voltage from the battery causing it not to have enough juice to create a spark.
That's the last thing I would have ever thought of.
I've been replacing all sorts I.e sensors, fuses, relays, immobiliser, ecu, coil pack. Checking everything I've done since its been off the road. Testing all the wiring loom. Looking for a dodgy plug, broken wire or dodgy earth. And it turns out to be a starter motor?!?!?!? WTF.?

I'm so relieved I've finally found the problem though, you wouldn't believe how close I've been to smashing it up and breaking it lol!
I also now have LOADS of spare parts which should keep me going a while and could take a degree in auto electrics from what I've learnt over the part few months.

Cheers for the input everyone it's all helped into pinpointing the problem.

 

Speak soon chap - am up that way every couple of weeks