Cold Starts

[adam 32]

the car doesnt like to start cold....

but if you rev then it will start.

what can this be?

spark plugs?

not enough air in pipes therefore need to rev...?

[GTStR32]

I have the same problem dude, it pisses me off

[macka]

The ecu is programmed to send fuel to ports on start up without need for touching throttle.

I would think if u need to do this id say ignition timing could be too retarded uumm what does your cars rev at when its cold?

Maybe sticky Idle air control sensor which is on the plenum sorry dont know how to check it tho!

[Guest Boxhead]

its not neccesarily cold starts that make myn not start.. its at my place.. wont start first try of teh day...

but when i was in sydney, i noticed where i parked the car.. it was downhill.. not slightly up hill.. so maybe that has somethin to do with it...

in sydney, on even freezing cold days, would start straight away

[macka]

Damn you are a postwhore boxcar just saw your no of posts hehe

sorry

carry on

[002 NVS]

I dont know about skylines because I havent got the same problem with mine, but in my old GTi corolla I had problems with starting it codl or hot, I would have to pump the accelerator to get it to fire..

After I gave it a service and a *new set of plugs* it started beutifully..

Give it a go..pull your plugs and see what they look like, check the gap. If they're no good replace them and see what happens..

If it still doesnt work then u may as well give your car to me....

hope it helps..

Scott

[whatsisname]

Badly fouled plugs (especially if they're cold heat range!) will may cold starts very difficult!

[adam 32]

yeh plugs was my initial thought

macka: ignition timing is slightly retarded but not that much and it idles fine... 7-800rpm at hot and just over 1000 on cold

am changing plugs tomorrow so will let you all know!

thanks for the repsonses

[Bozz]

The ignition barrel has two wires coming from it when you turn the key to the "start" position. One wire goes the starter motor, the other wire goes to pin 43 of your engine control unit.

When you turn the key to the start position, the ECU senses that you are attempting to start the engine by using the starter motor, not attempting to roll start the engine. Since using the starter motor demands a bit over 100 amps of current, your battery voltage falls quite dramatically. To compensate for this, the ECU makes the injector pulses much wider to get the fuel into the motor. It may not do this if you have your foot on the accelerator so it could even be the throttle position sensor faulty or misadjusted.

If you had an alarm installed when the problem started occuring, take it back to the butchers... oops I mean installers who fitted your alarm and have them correct it.

Cheers

[adam 32]

well i got a new set of plugs in the other day

its a much smoother ride and no flat spot when cold. it starts a little better but still not perfect, guess ill just have to learn to live with it its not a big deal anyway

thanks for the replies guys!

adam

[boosted32]

If plugs are fouling often then u are probably running too rich. I fouled a set of new platinums after only 100kms before i got it tuned properly. It would still run but was missing badly.

[adam 32]

i know im running rich but only have a remapped std ECU, which is gunah cost $400 to remap. im around the 11 mark at the moment

[macka]

you run 11;1 with the to4 Adam?

14psi im getting 13:1 bad news 4 me

[adam 32]

yeh, 11:1 at 0.6bar (9psi)

and 12:1 at 0.8 bar (12psi)

[Ait]

Hi guys, is 13:1 at 14psi bad news? Too rich? Too lean?

[macka]

Originally posted by macka

you run 11;1 with the to4 Adam?

14psi im getting 13:1 bad news 4 me

Cant even remember saying that

13:1 full load is pretty lean

Most guys agree with anything under 12:1 safe

After i fit my fuel pump in it brought it back down to 10.2:1 and then tuned to 11.6:1 roughly

[red17]

My 32 GTSt also starts badly when cold. Can usually get it to go first try now, but sometimes 2. Ive just got mine back from having 2 exhaust valves done so its got all new plugs in it, theres NO internal issues with the motor. Still starts badly

Ive been told this is a common thing with cars that have had remapped ECU's or aftermarket ones. Many have cold start features removed. Mine is a Blitz Access ECU.

After doing 2 exhaust valves in cylinder 6 and ingesting an electrode, my advice to anyone out there wanting to run 1 bar with a stock intercooler is, DONT.

Red17

[macka]

Originally posted by red17

My 32 GTSt also starts badly when cold. Can usually get it to go first try now, but sometimes 2. Ive just got mine back from having 2 exhaust valves done so its got all new plugs in it, theres NO internal issues with the motor. Still starts badly

Ive been told this is a common thing with cars that have had remapped ECU's or aftermarket ones. Many have cold start features removed. Mine is a Blitz Access ECU.  

After doing 2 exhaust valves in cylinder 6 and ingesting an electrode, my advice to anyone out there wanting to run 1 bar with a stock intercooler is, DONT.

Red17

You dont think that it would of still happened if u were running lower boost or a FMIC?

Well at least your back on the road..

I would hope tuners like Blitz wouldnt remove the cold start function on your ecu because its not to anyones advantage..but i guess its possible.

I have found when my timing is retarded slightly i have this problem, I assume its been checked but if you run abit more....18 degrees it may fix it..

just a thought

cheers

mac

[Cubes]

Mine splutters every now and again on cold starts.

I tried turning the ignition to the on position for a couple of seconds and then starting but it did the same.

Slight splutter then up come the rev's.

Also on the note of AF's.

When i had mine on the dyno with the new fuel pump on 15psi she was down at around 10.5:1.

Is that normal for a 32 with a stock turbo?

[macka]

Yeah Joel its normal and i bet it was belching out black smoke on the run if u were there