Rb25 Cranks For About 1 Min Before Starting

[t304vkcalais]

so got my new motor in and was having this same issue before, car will crank for 1-2 mins before it starts, during which time i have to pump the f**k out of the throttle evertually it starts fireing.

have had the car at a sparky's and he said there may be a wire that needs to have 12v given to it while cranking to get it started, any idea which wire this is, is a stock ecu at the moment.\

tim

[kitto]

Yep there is a wire that needs to be connected for crank signal.

Pin 43 on the ECU if its s Non NEO 25.

Should be grey with red trace. Needs to be wired to the starter soleniod wire. Black with yellow trace. (Should be one already near the ECU in a plug)

[jiffo]

It must already have Pin43 start signal input, otherwise you could crank forever and it's never going to start.

Have you checked the fuel isn't draining back to the tank when the engine is off?

Some fuel pumps need a non return valve. (Bosch 044 etc)

[kitto]

  On 20/11/2012 at 9:27 AM, jiffo said:

It must already have Pin43 start signal input, otherwise you could crank forever and it's never going to start.

Incorrecto.

All the ECU does when it sees this input is richen up the mixture and i believe advance the timing.

Not having the input just makes it harder to start.

[jiffo]

Not in my experience.

Without a start signal the ecu can't reset the timer function, one try and that's it.

[kitto]

  On 20/11/2012 at 8:14 PM, jiffo said:

Not in my experience.

Without a start signal the ecu can't reset the timer function, one try and that's it.

Come again??