welll.....its decided to fix itself.

left it standing for thurs friday the weekend and monday as i was ill.

monday morning and every morning since.....problem has gone.

not an effing clue

________________________________________

the world is changed by people in sheds

not really.....it has been happening since i cured another random issue by replacing the green temp sensor 3-4 months ago.... it would get a gammy/bad idle only when upto temp and slowly get worse intill i blipped the throttle.

i think this problem though was more electrical/ecu than cercumstantial. its repeatability was daily, every morning and at 2000rpm...

its very annoying and not.....im glad its stopped happening. but i much prefer the satisfaction/reassurance of swapping out a part or finding a busted wire and that fixing my problem....

i feel like at some point in the future it will rear its head again, just as im gaining confidence in the cars reliability

funny thing was the last sensor i havnt replaced is the air inlet tempreture.....which turned up thursday.

i darn't fit the thing as im sure the ecu reset will make this problem reoccur.

________________________________________

the world is changed by people in sheds

it wasnt

any ideas on what else could be causing this?

________________________________________

the world is changed by people in sheds

thanks for keeping up with this, really annoying issue.

i went for denso iridium super fine tips when i replaced the spark plugs over a year ago. along with a set of supposedly working 2nd hand coil packs from spoox.

one of the coil packs had cracks in the resin and i asked for a replacement but the "fine gentleman" told me no...

i did use a cheapy ebay spark/coilpack tester and every coil did seem to have a nice consistant long strong spark.

saw a youtube video all about fake iridium spark plugs with wildly different internal resistances...havnt checked mine yet.

i also got a cheapy compression tester but i am yet to open that box of woe.

could it be to do with coil packs, spark plugs or compression?

________________________________________

the world is changed by people in sheds

new lamdba, cat/rest of exhaust was used but didnt seem clogged. passed emmissons at mot so...should be ok.

i do have the teeniest of pin holes in my exhaust. one right by the flange weld on the tube (not the manifold itself) where it connected to the manifold (pre lambda) and one about a foot after the lambda before it goes into the cat.

i was thinking maybe they close up when warm... but when they are hot, they still leak what seems about the same amount.

i cant remember exactly, but i do recall something about close loop, open loop cycles and automatic cold chokes done by ecu.
i.e. when cold, the ecu wont use the lambda sensor untill its warmed up. it will instead use a set fuel map and other sensors until it can use the lambda?

ergo....i think maybe to narrow the problem down (a bit) the issue is to do with this cold startup cycle.

i think i need to do a bit more testing, then fire up the parts cannon again

________________________________________

the world is changed by people in sheds

this problem is still happening... gave up diagnosing it as its a minor issue and i had other more important things to worry about fixing....(starter motor, brakes etc)

but recently i went down the google AI rabbit hole....with maybe some success today...and flashbacks to previous experiences with this gti6. (a part i replaced as new was/is faulty)

went through most things suggested.....nothing really worked.
even tried some wynns hydraulic lifter cleaner....significantly quietened/stopped my engine ticking but orignal issue still present.
it kept mentioning the green coolant temp sensor plug but it was new so i didnt try testing it.

unplugged the thing....went for 20 second drive drive and the problem wasnt there. i then turned off the engine and quickly quickly plugged it back in, restarted the engine and the problem still wasnt there. i was kinda hoping the problem would reappear confirming things.

annoyingly....i have to leave the car to sit overnight (12hours+) for the issue to reappear. so testing is a slow once a day type deal.

so im unsure if replugging it back in and it not showing the fault again is because the engine had warmed up enough, or something else.

the AI mentioned the temp sensor can become sticky/static if left to sit and it "cold soaks". giving a wrong resistance showing the coolant temp as wrong until the engine heats up enough to kick it into a "working state"

ill have to keep testing but, is this a thing?

________________________________________

the world is changed by people in sheds