strange engine behaviour - any clues???

its the recommended ngk plugs, 'cept i think they the "r" type. think it has a resistor in it. at the time of service, a sunday, thats all i could find.

the engine isn't consuming any water, and there is no mayo in the oil cap. so i think the headgasket is fine. its new 15000km's old, and the car hasn't been overboosted, or overheated at all!

hmmmm

it sounds to me like your plugs are bombing out man...

my personal recommendation (if you running stock boost) get some BCPR6-ES - stick that in there and check what it does in traffic.

thats what i got, except that i remember it ending in 11, which means it comes with a gap of 1.1mm.

i just couldn't remember that code - but that r in the middle is what i was referring to.

i'm hoping its not a coil problem that only rears when the coils get hot!

are you sure about that plug name?

cuz the only ones i remember ending in 11 is the platinum ones - and they defo need gapping smaller

i dont think they were platinum cos a set cost less than 100 bucks, in fact i think it was about R45.

but i gapped them to 0.8mm anyway!

i will get them out again, right down the code, check the gaps, and drive around with my coil cover off for a while!!!

dislex, and anyone else...

i changed the fuel pressure slightly, up around 0.5 bar at idle, and the car changed its behaviour. it was fine for most of the morning while i was running around randburg.

then got on the freeway to work (all the way in bedfordview) and it was also fine.

then it cooled for about 2 hours, and i almost made it home without a hitch.

but its behaving differently now when it gets hot - the misfiring is only between 3500-4000 rpm.

how's that???

Mine did the same when I bought it, my problem was a the AFM, it was a bit dirty on the "wires". I took the AFM apart, cleaned the 2 thin wires with alcohol a a cotton earbut thingy and that was it, might be the same problem but it could be something else.

i did clean mine recently - but it might have gotten dirty again.

i will check this out too.

thanks hennie

cleaned the 2 thin wires with alcohol a a cotton earbut thingy and that was it, might be the same problem but it could be something else.

Various degrees of fault situation - by widowmaker