1uz with link - no cold start? also... need a/c

[liftback]

Whenever i start the supra up, it wont idle until it has warmed up (to about 20-30C), so does that mean that the link hasnt been setup for cold starting? can i take it to a tuner and have it programmed for cold starting?

also, the a/c wasnt hooked up when the engine was put it. the pump is still there, so will it be very hard to get it hooked up? the car had a/c originally.

cheers

[loose_unit]

As far as i know all the link does is add in extra fuel when its cold, theres no idle up or anything, unless you have set one up with the link setup.

My starlet with a link idles at about 5-600 rpm when its cold, you learn to live with it

[liftback]

thats the thing though... i doesnt seem to be throwing in any extra fuel because it just stalls when cold - so i need to have it programmed to throw in extra fuel when cold.

[vvega]

if it wasent throwing extra fuel in it wouldnt start.....
you will find the cold start solienoid is not working or isnt hooked up
i do not think the normal link can do the 3 pin varable idle valve like in the iuz so you may have to just get something made or make on up yaself

v

[liftback]

Ok cheers for that, I might take it somewhere that deals with links once ive got the clutch sorted.

[matt dunn]

thats the thing though... i doesnt seem to be throwing in any extra fuel because it just stalls when cold - so i need to have it programmed to throw in extra fuel when cold.

I think you'll find it's not throwing in any extra air rather than fuel,
as a cold engine needs extra air when cold to make it idle,
and as said you will probably find that the link is not controlling it.

Matt

[liftback]

Sweet as. When i get some cash ill take it somewhere to get re-tuned anyways (because i dont really know what state of tune its in at the moment), and see what can be done about the cold start at the same time.

[Punter]

Let us know what happens my dad is having the same cold running problems in his rally car running a nissan V8 with a link. Runs really well when warm though

[Tukumi]

A cold engine does need more fuel to have correct mixtures at idle. Although it shouldnt run much richer than a hot engine due to most of the extra fuel that your putting in doesnt make it to the cylinder as it creates a film on the intake runners and ports due to the cold temp of the engine.

My flatmates s13 silvia with Lexus v8 doesnt run idle speed either but it still idles at 800rpm when cold. There is alot of varibles in cold starting of engines which makes it kinda tricky for someone not in the know to set them up properly.

What is done to your 1uz engine as we have a good base map tune for a fairly standard setup with exhaust and filter.

Phil

[liftback]

Oh when I say it doesnt idle, i mean it doesnt idle at all - as in it dies everytime its started - I have to keep my foot on the throttle and bring it up to aobut 1000rpm until its warmed up a bit before it will idle properly.

1uz in an s13? niiice...

The engine is pretty stock, just a pod and exhaust (although it doesnt have extractors at the moment - going to sort that out and have the exhaust done properly before i take it in to get tuned).

[Stephen]

My supra was the same the first 2 tuners didnt get the cold start right they made it sound like its to hard to do.The guy doing my tuning now has got it better.The problem is they only really get 1 chance a day at changing the tune on a cold start.So it takes quite a few days to get it right.

[liftback]

Who does your tuning?

[RedMist]

As per VVegas and Matt's post. Its not a fuel problem. You can't tune it out. Its the fact that you can't drive the 3 wire stepper motor with the link for idle up.
You can alter cold idle fuel which will give you more or less fuel dependant on how you change it. However all this will do is make it harder to start and you'll still end up putting your foot on the acclerator until it warms.
You may be able to drive the the 3 wire idle up motor with a stepper motor driver from Jaycar, but I don't know enough about those controllers to be able to dictate thier function.

In addition if your looking for AC idle up, (IE the car doesnt stall every time the compressor engages) then you'll have the same problems as above, as it uses the idle up motor. AC Idle up is only available on the Link Plus.

[Boldy]

trying poking around on http://www.lextreme.com/forums/ there are people there using aftermarket ecu's that are having/had your exact problem.