Car Wont Start When Cold

[falky929]

does any one no why my car wont start when its cold once its warmed up its fine only when its cold u have trouble starting it

[{Oo{34}oO}]

ill just take a random stab in the dark as 2 being no fuel in the cold start???

[Chibs]

when you say trouble starting.. do you mean you need to turn the ignition more then once and give a bit of gas whilst it idles? if so this happens to mine and i thought it was normal ? =\

[falky929]

yeah thats what i mean i changed the spark plugs and it started better for a few weeks but now its bad agian

[MBS206]

If it doesn't start when cold... How do you know it'll start once warm?... Food for thought...

[skylinecouple]

Need more info. Car type ? Doe it have a computer ? What plugs are you using ? Have you reset the standard computer if thats what your running ?

[falky929]

Need more info. Car type ? Doe it have a computer ? What plugs are you using ? Have you reset the standard computer if thats what your running ?

its a gts r32 with stock compture the plugs are just standed ngk ones chanded a while back

[MBS206]

its a gts r32 with stock compture the plugs are just standed ngk ones chanded a while back

Changed them to what sort?

[falky929]

Changed them to what sort?

just the nkg standand ones it had the the nkg Iridium plugs in it that i told out maked the car start the same

[toygtr]

I had problems with this for a bit also rough idling. Was told by racepace that it was my air flow meters. They just needed a clean. Just used throttle body cleaner in a pressure pack. Gave them a quick spray and was all good. Apparently they get a build up of shit on them. Maybe try that.

[skylinecouple]

Clean AFM, good start, definately. Could be water temp sensor but I would think that would only keep it in cold start longer. Check all your earths as fuel pump, coils are severely affected by bad earth. Couldn't be fuel filter blocked as it would affect overall performance. Hmmmmmm........

[mad082]

could be:

cold start valve

IAC valve

AAC valve (or a combination of all 3)

fouled plugs caused by the above

fouled plugs caused by them being too cold temperature plugs

weak coil packs or ignitor

dirty/faulty AFM

and if the ecu is aftermarket, i'd say the tune needs adjusting.

also try letting the fuel pump prime properly before turning the car over. there is a small possibility that the valve in the pump is dodgy and letting the fuel drain back.