the shreksta

iTrader: (20)

my blob wrx with sti8 engine seems to be over fueling when warm, the car starts fine when cold but when warmed up if you turn her off then go to start her she starts but ticks over really slowly and puffs out black smoke for maybe 2-4 seconds then it returns to normal and is fine until you switch her off again.duncan checked the fueling 2 days ago and its fine so im a bit stumped.

any ideas?

car runs a vf35/650cc injectors/rcm340 pump/full decat/rcm induction kit/sti inlet red manifold with tgv delete/sti top mount/oem recirc valve/sti 8 lump with avcs heads but not running the avcs

piehole1983

iTrader: (7)

Have a look at the vacuum hoses mate, mine was doing something very similar and I found a split hose near the BOV and a hose completely off the solenoid that sits under the intake manifold. I also had to reset my ECU after fixing the vacuum hoses. Mine has been running 100% since doing that.

RedScoob

Would a sticking injector have similar symptoms?

the shreksta

iTrader: (20)

shouldnt be as they were cleaned/tested and new seals before fitting

the shreksta

iTrader: (20)

will check them cheers

piehole1983

iTrader: (7)

An injector sticking open would surely cause loads of backfiring as it would be throwing fuel in on the exhaust stroke. Would behave like anti lag I imagine.

the shreksta

iTrader: (20)

i also had duncan map in some pops and bangs but i dont think that would affect it.it drives fine,no smoke on boost its literally when you go to start her when warm

piehole1983

iTrader: (7)

Possibly the idle valve then I guess?

tubbytommy

iTrader: (20)

no, if that was faulty it would idle all over the place, not return to normal after a few seconds.

tubbytommy

iTrader: (20)

if it was overfuelling it wouldn't just do it for a few seconds, same with injector faults.

the shreksta

iTrader: (20)

any idea what it could be?

piehole1983

iTrader: (7)

Any fault codes stored in the ECU?

the shreksta

iTrader: (20)

there was the knock sensor when the car big-ended but that has been cleared

dynamix

iTrader: (3)

Matt - i can stop by next week and resolve if possible in the map or look at other causes for you .. Probs Wednesday... ?

the shreksta

iTrader: (20)

yeah ok matey,i will bell you in the week. any idea what it could be?

the shreksta

iTrader: (20)

hi dunc,you still up for having a poke around at this? if so drop me a pm and we can sort out a time

cheers

the car really stinks of fuel now so im getting a bit worried about it

dynamix

iTrader: (3)

Bugger. Just got back from rcm - didn't see this til now.

gimme a call / text and we can schedule a day to do it.

the shreksta

iTrader: (20)

ok mate it will be in a week or 2 as im off to italy today

the shreksta

iTrader: (20)

really getting pissed off with this now,duncan has gone through the map with a fine tooth comb and nothing is showing as a fault but yet the car is still doing it

i have changed the cam sensor as but that has not worked

piehole1983

iTrader: (7)

I noticed someone mentioned the injectors at the start of this thread and also noticed you said they had been overhauled too but have you checked ruled them out yet?

the shreksta

iTrader: (20)

Surely if it was the injectors then it would be problematic most of the time and it would show on duncs lap top when he was investigating it.the car drives fine on and off boost and starts from cold at the flick of the key but when warm it puffs out black smoke when started and it ticks over really low for maybe a second or 2 then it settles at the correct idle

Jolly Green Monster

iTrader: (4)

Atmospheric dump valve fitted?

piehole1983

iTrader: (7)

Just a suggestion matey, nothing should be taken for granted!

the shreksta

iTrader: (20)

Standard oem dump valve mate

Jolly Green Monster

iTrader: (4)

check the dv isnt leaking

the shreksta

iTrader: (20)

I will swap it for another.would that cause starting issues?

Jolly Green Monster

iTrader: (4)

being recirc it is less likely but still possible yes..

the other option is of course there is too much fuel in the start enrichment when the engine is hot

the shreksta

iTrader: (20)

What causes that and whats the remedy?

Jolly Green Monster

iTrader: (4)

if its DV replace it with a working one, stronger spring..

if its start enrichment then its part of the map