Idle weirdness for a bit...

i57dwun4yb1pt8

had a weird one .
hadnt driven the 2015 fabia for 3 or 4 days , started it yesterday and it put up an amber engine light , and stop start warning, and idled with a heavy vibration and chugness . did this every time i started it for 4 or 5 goes . so i OBD it and it says start stop error and p0304 cylinder 4 misfire .

i left it a while then started it again . same thing

another hour later , it started fine , so i drove it up and down driveway , sounded a bit rattly or wheezy then cleared up .


left it over night and it started fine every time this morning , also up and down driveway .errors are all gone

only thing i know occurred in the last week is i drove it on and past tank redline for about 20km before i got to a petrol station , then filled it up .


i randomly thought maybe id dragged some tank crap into a cylinder so
i put dipethane in it today and ran it for 40 mins on idle and revving and it seems ok . no more errors

any ideas why it would throw a wobbler like that though ?
( it has a new AGM stop start battery since last june coded to it by local garage when the old one started dyng )
i
freaked me out as it was chugging hard the first time.

colm_mcm

Which engine is it?

i57dwun4yb1pt8

cjzd 1.2 tsi 110 hp

it had new plugs two years ago and the timing belt was checked last year for any wear .

colm_mcm

No answers, sorry. I’m more curious because I know of a 1.2 3 cylinder with a similar issue.

i57dwun4yb1pt8

if its in the south east pm me !