Rough Idle On Cold Start

[hairdryer33]

Almost feels like an old dodgy carby! Idles rough as shoots fuel out the back and get even rougher if I touch the throttle and stalls. I have driven a few times when cold, if I stop instead of rolling through say a giveway sign, the car will stop and cant be started for a few mins, only then holding the throttle flat (like a carby) will it start again. Other than that any attempts earlier it'll just keep winding over and getting too much fuel. 120psi across all 6 so its getting tired but doesnt use or blow smoke.

[Dose Pipe Sutututu]

What ECU are you using?

I vaguely remember you wanted an e manage.

Poor water temp vs. injection would attribute to your horrendous start

[Hadouken]

boost leak...

[hairdryer33]

Stock ecu, no boost leak either. Was thinking maybe iac valve? Really got me stuffed as to what it is

[hairdryer33]

Also to add to my other post about rough, sluggish between gear changes at times, slowly feed the loud pedal its normally ok, but mash it and grab 3rd it runs rough like its dropped a cylinder untill I back right off, let it coast then re apply the throttle

[Hadouken]

Major miss fire. What are your spark plugs tapped to?

So you did a smoke test I take it?

[hairdryer33]

It was doing it with my stock coil packs, now ive put ls1 coils on and still doing it. .8 for the plugs. No smoke test as yet, only an issue really when cold or occasionally after a flogging. My afr gauge reads fine however I suspect the fuel pump may be a problem

[Hadouken]

The afrs would not be fine if the fuel pump is dying

[Dose Pipe Sutututu]

Are you using a real wideband or those stupid narrowband gauges that show absolutely nothing but flashing lights.

By the way, LS coils will need more ignition dwell time to work properly. Given the fact you're using a stock ECU I am under the assumption there isn't enough spark generated

[hairdryer33]

Using a wideband. Im aware of that needing the dwell changed in upper revs, but already is an improvement over the crap old ones I had

[hairdryer33]

The afrs are good when on power but when it plays up I did see once the afrs shooting between 13 th 16

[Hadouken]

So afrs are shit when the problem occurs.

Either go and get a smoke test done or get a tune.

[hairdryer33]

Yeah they are. Hopefully get it sorted soon cheers

[hairdryer33]

Afr changed to 19.5 and stalled, cranked over wouldn't fire. Fuel pump I bet

[Dose Pipe Sutututu]

Or feked fuel reg

[hairdryer33]

Ive used stock and now turbosmart fpr still doing it

[Dose Pipe Sutututu]

Ive used stock and now turbosmart fpr still doing it

and what fuel pressure was the turbosmart FPR telling you?

[hairdryer33]

45psi base. Thing is, first cold start is shit as any throttle input it runs even rougher and sometimes stalls and will crank over for about 15 seconds then fire like its flooded! Fuel pump appears to work fine as its holding 10.4 afrs at full throttle. Ive changed afm cas tps ecu fpr and still doing it. Does it occasionally between 2nd and 3rd shits where I have to back off coast for a bit and re apply throttle to run smooth again

[hairdryer33]

Could be fuel pump as 10psi today afrs were around 13!