Starting issues

[SV62NV]

Hey guys

Lately when ever i go to start my car after not driving it for a few hours it takes about 4-5 seconds to start. It has never failed to start but it seems to be taking longer than it should.

However if i park at a shop go inside and back to my car in like a couple of minutes it starts instantly.

So it only does this after rested for a few hours.

At first I put injector cleaner in the tank but that did nothing, i've also recently had a fuel pump replaced.

Any ideas? Appreciate it

Shane

[hako]

Is it actually cranking over but not firing or taking 4-5 seconds to start cranking over?

[SV62NV]

It is cranking over straight away but takes about 4-5 seconds to fire up

[hako]

Then it sounds like the fuel pump is not priming when you first put the key in and turn - it should run for a second or two and you should hear it run - maybe get someone to put their head in the boot to listen for it just to make sure. Normally after the engine has been switched off for a short time there is still enough fuel pressure in the lines to start the car. After it's been parked for a long time the pressure leaks back and that's why it "should" prime every time you go to start the car.
If there is no prime noise try pressing the unlock button on the key just before you turn the key to start.
There may also be a problem (remote) with the oil pressure switch - have you recently washed the engine? Try swapping the fuel pump relay (under bonnet)

[SV62NV]

ahh cheers dude great info

Yeah usually when ever i go to the carwash i give my engine bay a light rinse over to get rid of all the dirt etc.

I'll give these a try when i get home, cheers bud

[hako]

The way it works (I think) is that once the engine starts and oil pressure get up, the oil pressure switch supplies power to the fuel pump. If the engine doesn't start (because the FP didn't prime), the engine will crank until oil pressure rises and the oil pressure switch detects this and supplies power to the FP and engine fires. How long it will need to crank to raise the oil pressure will depend on how worn your engine is.

This is a safety design - if you have a head-on and engine is kaput you don't want hi pressure fuel spraying everywhere in the engine compartment.....so once engine is kaput the oil pressure goes to zero and oil pressure switch no longer supplies power to FP.

So based on the above, the 4-5 secs of cranking may be sufficient to raise the oil pressure enough....however I could be completely wrong.

[SV62NV]

wow great stuff man and the best thing about it, it all sunk in , ill check it out tomorrow and see how i go

Again thanks heaps buddy

[tall guy]

Ok just bought a vr 94 SII wagon, it had the same problem, the people before me placed in a new fuel pump in but this didn't work so they sold it cheap to me and I took the gamble. One new fuel regulator, car runs a dream. Cost me in total $250 including the labor and a couple of new hoses just to make sure the beast keeps on running.