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OK Folks. Over the past few months Ive completed a J4RS Conversion into a friends 205. It started life as a 92 Gti (122 CAT) as a rebuild project that was 95% complete ( that final 5% is soooo hard to get to hey! ) We bought a 94 000 Kilometre Xsara Phase 2 motor ( Australia ) and converted it into the 205 using a Miles converted loom ( nice piece of work! ) onto the Xsara donk! There were 3 plugs on the loom that must have been different from the EU cars and so I had to cut into the loom and fit the correct plugs to fit the Australian delivered sensor setup on the motor. Using the VTS loom. The motor never had a stable idle in the 205 and missed and hunted in most of the rev range unless you had your foot right into it! And So began the quest to get it running! As I knew the motor was good and the fact I had left everything alone when I removed it and then installed it, I knew that it was either a problem with something on the car before the motor was installed ( fuel pump etc ) or my cock up somewhere along the line. The old motor ran like spanners, had fuelling issues etc so I thought it be a good idea to change the fuel pump, lines and filter to eliminate that. It seemed to sharpen a few things up but nothing to write home about. Not that side of fuelling anyway. Next to spring to mind was the VSS sensor. Through searching on the forum, some had issues with this not functioning correctly and was giving poor response at low speeds. I knew the VSS came from the car we removed and the car drove well so eliminated that. I checked it to make sure with another known working one and there was no difference. In the middle of this the radiator decided to give up and so had to change that. ANother day gone. I then wanted to change the TPS. Lucky I had bought another J4r motor in the week and it was delivered that day, I was able to rob a few bits from that to check on the other lump. The ICV! Lots of information on here. Not much worth noting! Most cases seem to end with the owner walking away with hands in the air! Not actually figuring out the problem in the end! So I changed it out. THe exchanged item was terrible and so reverted back. Reverting back I tried a method i read up on here about turning the ignition on and off to perhaps wake up the ICV ( very loose term that! ). It was fine and back to the way it was when pulled out. Not the Icv then. ( I did not mention before but the idle was not great, it would eventually slowly stall and hunted up and down ) Next on the list was the TPS. Swapped out, no difference... and a pain in the arse to get to without removing the TB. After lots of head scratching and late nights pouring over threads on here ( mind you Im not mechanic and have only learnt all things 205 from try9ing them! ) I stumbled upon how to test the sensors http://www.306gti6.com/forum/showthread.php?id=80340&page=1 So, tonight my mate came around with his multimeter and we started testing with the MAP sensor. Now because I think Im awesome and anything I would ever do could never be worng. Well.... One of the plugs I had to change on the loom to take the Oz style sensor layout was the MAP sensor, I had to cut up the miles loom a little and fit the plugs form the OZ loom to make it all plug together. When testing the Map sensor the voltages were around the wrong way. 1 and 3 were back to front. So, we switched the around and the car it totally different. Its almost perfect. It now revs very cleanly and idles and behaves as should...almost! There is a slight hesitation below about 2000rpm and the idle is off a little when hot. I ended up having to take the throttle body off and I think the gasket will need change as they never seal well a second time. Otherwise, it sings! So. Point to my huge story is that I have read lots and lots of stories about these 6 motors not running correctly and then people spending loads on replacement parts changing this and that all over the place ( like me !) when all you need to do is spend 30 minutes with a multi meter and you will know which sensor you need to change or what wires are not working from the ECU. It sounds and seems really intimidating to read about and to someone who thinks they know nothing about electrical, but its really simple, not really any tools required and can be done in 30 minutes. I want to chase up the final hesitation at low revs but Im really happy to have figured it out! These motors really crank in a 205! Will report back.