38 - Long time no update
A bit cut & paste but bear with it to get it up to speed
Give the engine bay some tlc last weekend. As bought - functional
Whipped inlet plenum/fuel rail guard off and give them a clean up with wire brush on a drill.
I had some carb restore paint kicking about so give it a light coating as free and in stock.

Had a new inlet gasket in stock so stuck it on as the one fitted had been re used a few times in my ownership. Regret not painting camcover whilst i had it off when resealing it/doing belts last year.
Refitted when dry. Degreased the painted surfaces and give them a polish/wax by hand and some trim gel on the plastics. Its no show winner but tidy enough for now. Will do engine mount to suit when i get more paint.
Fired it up and running fine. Come back to it a few hours later fire it up and slight misfire on idle and can hear a ht lead arcing out on the inlet ! Moved the leads and it stopped - guess leads are well past their best so have ordered a new set of oem renault leads so will need to strip the plenum off again next weekend lol. Hoping it will cure the occasional misfire it has.
Ordered new oem Renault beru leads to replace the knackered ones fitted.
Cant beat new oem parts in the original packaging.
Quick stripdown had to be careful not to chip my painted inlet.
Old vs new, lead that goes to cylinder number 1 looks damaged where it meets the plug when looking at them carefully. Note new leads are 90deg compared to the old ones that come straight up from the plug.
Fitted
Runs & idles bang on now, the slight hesitation it had has gone. Its nice and smooth compared to last weeks poppy 3 & 1/2 cylinder idle so quite pleased with that as i feel like ive been chasing this for a while.
Next job was to try my new ecu/uch & key. Basically my uch has a fault - rear door is always open lighting door open symbol on the dash and the rcl does not flash when locking the doors. Its minor but annoying so want it fixed before any future mapping etc. I assume somebody has put the immobiliser chip out of the 172cup uch into a n3 out of a povo spec clio as the engine is listed as d4f as pic below.
Received a package on Wed this week with new N3 uch/ecu and key

batt negative off and pulled my ecu out - mine is on the left and different ecu.

Pins matched so stuck it in and fitted uch, 5 mins job done as uch is easy to access. Stick batt negative terminal on and tried central locking off the key which worked correctly giving 2x flashes of indicators when locked and no door warning illuminated so my wiring is good and old uch is faulty. Ign on and a solid immobiliser light - locked/unlocked a couple of times then ign on immobiliser light went off - fuel pump primed up and fired up.
As expected asr/eml and serv light were on as mine has no abs etc and this uch is configured for stock 172. Scanned it with my cheap bluetooth dongle as not got a can clip at the mo and post cat lambda fault stored from previous car. Cleared it and only other issue is high idle for some reason 1200rpm ? Unsure why this is as no air leaks and no issues on old ecu.
Need to hook it up to clip when my new clone can clio turns up and see whats going on, may be related to lack of abs/asr? Will reconfig uch reset throttle parameters and go from there. Refitted old setup for now so can keep using it with normal 800rpm hot idle.