Right guys, I've had an interesting day!
I set out this morning, and soldered all my Racelogic connection and heatshrunk them all - They are now proper permanent connections. This took me ****** ages to do as for the awkwardness of it!
Once i had done, i crossed me fingers and started the car. No luck! Still only running on 3 cylinders. So i swapped the spark plugs and tried again...Still...Nothing!
By this point i was getting rather p*ssed off with it! So next port of call was the coil packs. One by one, i disconnected the coil pack plugs and started the car. The first one i unplugged (cyl 4) made no difference, with all the others (Cyl 1,2,3) all making it run on 2 cylinders.... AHA! i thought - duff coilpack!
So i touched the branh of the exhaust manifold for that cylinder and it was cold, where all the others were rather hot!
I swapped Cyl4 with Cyl1 coilpack (after letting mani cool down) and repeated the process - Still cyl4 playing up!
Still thinking coilpack?
WRONG!
I took the coilpack out (cyl4), and with a spare spark plug, put it in the coilpack, and grounded it and started the car - No spark!
This pointed to a wiring fault, so i disconnected the plugs from the ECU and buzzed them all out continuity - nothing very little happened!
Thats when i had a brainwave!
On the earlier 1.8T, there is a spark generator or something - It sits on the airbox lid. The cilpack wiring goes from ECU>Spark Gen>Coilpack.
I checked continuioty from coilpack to the spark gen - OK
I checed continuity from spark gen to the ECU - OK
FINALLY! I had found the culprit! I borrowed a spare one off of my mates Mk1 1.8T, and gave it a go. Started car and after a bot of a splutter, it was running perfectly on 4 clyinders!
WOOHOO!!
put mine back in and it ran on 3 again. Conclusive i think!!
So, i'm now pretty certain that this has been the cause of my hesitation issues, and it finally gave up on Thursday evening.
Its taken me the best part of 5 hours today to sort this god damn thing out!
ETKA calls it a Control Unit Power Output Stage.
Rich