VP V6 will not start!!!!

[v8supra]

G`day guys,i have a vp 6cyl that left me stranded on the side of the road a while ago,sitting at traffic lights it just shook violently then died,hasn`t started since!!I have replaced the fuel pump and filter,checked for spark which is good.I pulled the(infeed) fuel line off just before the rail and when primed there is plenty of fuel going into the rail.None comming out past the fuel pressure regulator but i`m not sure if there should be any when the engine won`t start???It will start if i squirt some aero start up the intake but only untill it runs out of that (few seconds).I`ve put a test light on the injectors and they are getting power so as far as i`m concerned this car should start and should never have stopped in the first place!!!Ive done a search and there was only 1 post with the same symptoms as mine but there was no final answere to the problem.Also have checked for error codes but code 12 only comes up.Any help please guys before my anger makes me do bad things to this car
cheers.

[delcowizzid]

you should get a bit of fuel going past the reg if the pump is going at the time.plugs wet or dry ide say the ecu isnt triggering the injectors pull off all the injector plugs then put one probe of a multimeter in the pin hole that doesnt feed the injectors 12 volts and connect the other probe to earth with the multimeter on ohm's and wind the car over to see if its pulsing

[Cheap6]

Spark from where? If the rotor button or distributor cap has died you can have spark from the coil lead but not at the 'plugs.

If there is no check engine light with the ignition on 'reds', the anti-theft system eg. over ride switch is also a suspect.

[v8supra]

thanks for the replies,Further tests have proved the injectors are not pulsing!!I got another ecu and still no start.I have no check engine light .Does the factory immobiliser stop injector pulse???
How do i bypass this system??
cheers.

[delcowizzid]

factory immobiliser normally stops pump as well so if its priming wont be that i dont think my bet is its not getting the dizzy module/ pulse to the ecu like someone else had a problem with on here not long ago oh flag that did you say its V6 not V8.my bad looking at your ride said VP5.0.dfi is the same for V6 probably not getting rpm pulses to the ecu and its just running in module mode spark.thats why it runs on either but wont trigger injectors.ide maybe find a dfi to borrow and try.or check the wiring at the dfi

[Cheap6]

I was thinking V8 too (with the dist. cap).

The fuel pump will operate anyway with oil pressure present on V6.

Without power to the ECM on the terminal from the factory immobiliser, there will be no injector pulse (nor ignition timing control - spark will still be present), nor will the CEL be lit with the ignition merely 'on' (as distinct from during cranking where it should be off in any case). If the CEL stays on while cranking, perhaps the DFI or associated wiring might be the problem.

There will be a key operated switch in the passenger side 'A' pillar that will bypass the immobiliser function if you have the key for it - it should have 'Zadi' on it somewhere. If not, the wires can be bypassed at the connector hidden behind the galvanized steel shield riveted to the body behind the passenger kick panel.

This should help some:

http://www.memcals.com/pdf/VN_V6%20Wiring%20Diagram.pdf

[v8supra]

Delcowizzid my daily ride is a VP 5.0 ute but i got a vp V6 berlina wagon as a spare car.The car i wish i`d never brought!!!This DFI you mention is that the plate under the coil packs??I`m a V8 man and this is my first v6(and the last) but i`ll get hold of another dfi and see what happens.
cheers

[delcowizzid]

it could be the immobiliser still as stated above do you get the check engine light come on with ignition just before the cranking stage.

[v8supra]

Thanks cheap 6...i don`t have the key for the doorjam switch but if replacing dfi doesn`t
work i`ll look at that next..cheers

[Not_An_Abba_Fan]

Silly question, but have you checked your EFI fuse and relay?

[delcowizzid]

EFI fuse should cut power to the injectors too if i remember right.and he has power at the injectors

[v8supra]

Yeah checked /swapped fuses and relays, all good there.Borrowed a workshop manual today and just had a quick read on how to test ignition module ect so i`ll get onto that on the weekend.I`m too angry with the car right now so i`m not going near it!!!
Appreciate the advice so far guys and will let you know how i get on this weekend.
cheers.

[v8supra]

AHHHH..........it always pays to do things yourself!!!I had a "assistant" check for injector pulse last time while i cranked the engine.Decided to check again myself and surprise surprise i have injector pulse.Decided to check DFI anyway and it`s fine.Lifted injectors out and although they are getting signal they are not spraying.Either they have all died or are all blocked through maybe a dodgey lot of fuel.Taking them to be cleaned /checked this week and see how we go.

[v8supra]

This whole situation is a joke!!!!!!!!!Just fitted reco injectors and still no petrol is being sprayed.Plenty of fuel going into rail when primed,injectors have power and are getting signal.i have spark......what more does this heap need to start!!!
I wish i could legally put a 186 in it and be done with this electronic rubbish!!!
i`m furious right now.

[Not_An_Abba_Fan]

Is it still starting with a squirt of aerostart?

[paytons_dady]

change the coil pack on it dude mi mates nr did it we changed the coil pack and she fired straight away

[paytons_dady]

vr comodore

[v8supra]

yeah still starts with aerostart.....think this is 1 of those 1 in a million problems...just my luck!!!As much as i want to push this car in the dam and put it all down to a bad experience i can`t die wondering why it would never start...In a few weeks time i`ll book it in to the local holder dealer and they can deal with it,....will let you know the outcome !
cheers

[delcowizzid]

if its running on aerostart it obviously fuel related im thinking fuel pressure/pump you should have fuel coming past the reg when the pump is running pull the pump relay and use a peice of wire to hard wire it on via the relay plug and make sure fuel is getting past the reg should still have fuel coming out there even when the injectors are maxed out so should allways have some flow out if the pump is giving it enough pressure

[v8supra]

i`ll give that a try ..at the moment there is no fuel going past the reg...i just don`t understand ...new fuel pump/filter/injectors.........when i pulled the old injectors there was fuel sitting on top of them .....just doesn`t make any sense to me.....this engine isn`t showing any signs of starting..........just cranks over

[delcowizzid]

you sure the injectors are pulsing if youve replaced the pump and stuff

[v8supra]

well when i put a test light across the injector plugs the light blinks when the engine is being cranked.The workshop manual tells me that`s exactly what it should be doing.

[delcowizzid]

could be the DFI/cas not telling the ecu to fire enough pulses or coolant sensor issues

[v8supra]

In a moment of madness i decided to buy new ignition module and coil packs.Still no start.Car is getting towed to mechanics on monday but i thought i`d have a few more goes at it....I`m leaning towards factory immobiliser now but i`ve done a search and can`t find much on bypassing this system or how to test.
Is there a easy(or hard) way to bypass just so i can rule it out??
cheers.

[delcowizzid]

key in the passenger door shut area give it a wiggle and see if its starts if it does remove the key and put a new one in or join the wires from it together