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

 

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.

 

Would a sticking injector have similar symptoms?

 

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

 

will check them cheers

 

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.

 

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

 

Possibly the idle valve then I guess?

 

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

 

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

 

any idea what it could be?

 

Any fault codes stored in the ECU?

 

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

 

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

 

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

 

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

 

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.

 

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

 

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

 

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?

 

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

 

Atmospheric dump valve fitted?

 

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

 

Standard oem dump valve mate

 

check the dv isnt leaking

 

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

 

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

 

What causes that and whats the remedy?

 

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

if its start enrichment then its part of the map