Poor Cold Start...

[mazgtr]

Since ive had my GTR its been a bad cold start car. If the car has been sitting for more than 8hours the car wont idle by itself without stalling. The car has 264 degree cams and a Apexi Power FC.

I have to sit and rev the car at 1500-2000RPM for about 2-3mins until it comes up to temp, then it'll idle by itself. Has anyone else had any trouble like this? Is it something i shouldnt have to put up with?

Cheers.

[insu]

No you don't have to put up with it, its a fault.

A fairly common one at that, so have a search, there is alot covering this.

from your description however, i'd go with a faulty cold start valve.

[Andyn]

I have the same issue as mazgtr on my GTS-T. I have to give it some revs when starting the car cold. Otherwise it will just die.

Where is this cold start valve your talking about. Any idea how much it would cost to replace?

[insu]

If its a 33 gts-t the coldstart valve is located under the throttle body. Just trace the idle bypass pipes from the inlet pipes further up the intake to the AAC on the back of the inlet plenum, and out of there to the coldstart valve.

As for the R32 Gtr, I am unsure.

[RB30-POWER]

Also you cold start enrichment values may need to be increased in value as well.

Has it always done it or just started to play up?

[mazgtr]

Its always done this since i bought it. I noticed that the 3 times i took it for a test drive from the dealership it was allready warmed up, so started for me fine on the 3 seperate occasions.

Ive actually just tried driving off while its still warming up, and the car backfires a lot, hunts badley, revs as rough as guts, and most times stalls itself, even when up to speed.

3-4mins of warming it up, and its like a butter smooth stock GTR.

Im guessing the Power FC in it hasnt been tuned for cold start good enough?

Does the Apexi Power FC replace the stock GTR ECU or work with it?

Does anyone know which is responsible for cold starts?

[RB30-POWER]

The PowerFC is a complete replacement ecu.

If you remove the passenger kick panel you should see immediately if it is actually a PowerFc installed in the car.

To fix the cold start values, you will either need to get a hold of someone with a hand controller or the datalogit laptop software to change the values. It sounds to lean on cold start if its stalling.

Its rather simple to change the values if you know what you are doing, so a workshop that does imports or tuning should be able to help you out easily.

A search for PowerFC should bring up the FAQ for them and im sure had suggested values in there for better cold start.

[godzl1975]

go get your car re tuned and ask for the car to be tuned for cold starts as well.

[mazgtr]

Yeah sounds like ill have to book it into the workshop then.

Cheers.