I'm Stumped... Help

[Jimmae Viper]

basically im running a R32 with a RB25det (see my garage) it is being a bit of a b*tch to cold start the engine... i have a few posibilities from other peeps and just want a few opinions

1. Ignighter problem ($1200 for a replacement from nissan even with staff discount )

2. Sparks(i may have got a bit enthusiastic tapping them to .8mm... will test this tomorrow )

3. Fuel pump (unlikely as it runs fine and is aftermarket )

4. Starter motor (as far as i can tell its working fine )

5. timing/air-fuel mix

any help on this matter would be much apprecaited and maybe rewarded with beer (not through post though)

Edited December 25, 2009 by Jimmae Viper

[Al]

Assuming you are running a stock rb25 with stock ecu.

Have you done a compression check on the engine?

When i lost partial compression in one cylinder, my car was a farker to cold start. At the time, i thought it ran fine, came on boost fine and still made the ass-end loose at the top of 2nd. But the moment my mechanic heard it, he knew i hurt the engine.

[blind_elk]

Exactly how is it "a bitch to cold start"? What ecu?

Maybe check out the cold start valve (on the underside of the inlet plenum).

[Yme33]

I had a similar problem with my old datsun suffered from VD (Voltage Drop) was only when it was cold mornings when warm no problem to start. does it play up in weather? or cold as not normal running temp?.

[Bozz]

Pin 43 on the ECU doesn't get 12v while cranking because it isn't wired up to the ignition 'start' position.

Edited December 26, 2009 by Bozz

[Jimmae Viper]

ok when i say a bitch to cold start i mean not runnning temp (weather doesnt affect it)[it fires but then dies or is really sluggish until it gets going, it also stalls if i igve it too much gas before it warms to running temp]...

i had a compression check done and its fine...

Stock 25 ECU...

ill look for the cold start valve in the morning as i gotta take off the body kit to get under...

as for pin 43 i dont mess with the pins ect so have no idea about that...

anyone know where i can get a diagramm for the engine as i lost mine from my computer (damn missus)

Thanks for the massive amount of response, now who wants to help me do a cut and polish

JV

[blind_elk]

What spark plugs? And try opening the gaps back out to 1mm, seeing as you are running everything stock. Try starting with the ECU temp sender (2-pin connector) disconnected.

Don't understand how a body kit can get in the way of the inlet plenum.

[Jimmae Viper]

yeah lol. i thought it was something else (for some reason i was thinking about under the car)

[hauie]

How old is your battery?

Perhaps giving the battery a full charge or replacing it with a new or different one laying around.

Im recharging my battery at the moment as it gives my car a sluggish start.

I might be silly thinking about the battery but anything is worth a try if you can be bothered.

[Jimmae Viper]

cheers but its a new battery and hasnt lost any charge