Savage Misfire When Cold, Goes Away At 50-60degrees C

[Ruffels]

I did an extensive search, and couldnt really find anything useful to help me

my problem is when the car is cold, it missfires really badly, coughs and splutters and won't drive right and is under powered

there is no problems starting the car, it starts like a dream, and then even idles like a dream, but if i touch the accelerator or try to drive the car it just misfires really badly and is under powered and hessitates

it also blows a fair bit of smoke as i drive up my hill after cold start (will this be the unburnt fuel from the misfiring cylinder?)

once the engine coolant temp reaches 50-60 degrees C the problem goes away and the car is fantastic!

i've got

splitfire coilpacks (few months old)

bcpr7es 0.8mm gapp plugs (replaced 3 days ago, the first cold start the car was great!, but then the next morning it was back to this problem)

fmic

3-3.5" turbo back exhaust

gt3071r - (1 month old)

555cc injectors - bosch yellows (4 months old)

z32 afm - (4 months old)

040 fuel pump - (1 year old)

power fc

what could be the problem?

[Craved]

sounds like cold start enrichment mapping is way off

[trel]

na, will be something simple like your coolant temperature sensor. cost bugger all to replace. change that and problem solved.

[ClutchBurndout-:(]

got the right plugs?

[Craved]

na, will be something simple like your coolant temperature sensor. cost bugger all to replace. change that and problem solved.

try unplugging this sensor (drivers sside of radiator - clipped to shroud)

my car would simply idle high with this disconnected

if unplugging it doesnt make a change then it wont be that

[trel]

+1 ^^ my bad for a rushed response!

[JonnoHR31]

if his power fc is showing normal temps as it warms up then the sensor will be working fine. assuming your getting your temps from the hand controller?

if you do have a h/c then check what the cold enrichment settings are

[Ruffels]

by cold enrichment settings, do you mean water temp correction?

if so

+80°c 1.00 1.00

+50°c 1.09 1.15

+30°c 1.14 1.29

+10°c 1.32 1.65

-10°c 1.39 1.73

-30°c 1.59 2.00

[STATUS]

has it got a new turbo on it? different one to the one it was tuned with?

[HEKT1K]

has it got a new turbo on it? different one to the one it was tuned with?

Yes it does. Could this be the cause of the problem?

[Crans]

Interested to find out the answer to this aswell

[Ruffels]

the only thing i can think of is that i havent had the car retuned for this new turbo... still tuned for old turbo, and i believe its running really rich, so possibly fouling the plugs and when the engine gets up to temperature its hot enough to overcome the fouled plugs?

because i put the new set of plugs in when it was stone cold, and it had no issues with the fresh plugs, but the next morning it started to come back.. and progressivly got worse over the next couple of days

and thoughts Trent?

i must get off my arse and get back in for the retune