Head Scratcher

[Casso]

]VR V6 only runs on passenger side bank,changed dfi,coilpack,o'hauled Throttle body and map,new fuel filter etc etc.
Voltage is getting to the d/s bank injectors,enough spark to kill a brown dog or a shetland pony, no vacuum leaks, was driving 12 day next day it wouldnt start, well it would only run on the 3cylinders, if anyone can put me out to pasture it would be muchly appreciated[/COLOR][/SIZE]

[sircruisealotVS]

bit weird, are there any error codes coming up (ie, is the engine light on)?
if there are use this - http://forums.justcommodores.com.au/...s-revised.html to get the codes and then this - Just Commodores - For All Your Holden Commodore Needs to work out what they mean.
thats a starting point to working out whats going on anyway.

[LJS-UTE]

leads and spark plugs in good nick?

[LJS-UTE]

or spark plugs even in correctly?

[Casso]

plugs and all ok error 34 comes up but that is due to not being enough vacuum, pulled the fuel rail and injectors out tonite and at moment giving them a good cleanup, was a bit of crap in the rail, hoping that it's just clogged injectors

[Casso]

cleaned injectors and fuel rail, still the same, OOOOOOoooooooooooHhhhhhhhhhhhhh my dery,deary,deary me!!!!!!!!!!!!!!what should I do?????too gutless to commit seweyside

[jules]

i would recommend getting the ECU checked out.

[Not_An_Abba_Fan]

Pull the plug out of the DFI, make sure it's clean and push it back in...really hard.

[blownba]

Its obviously not ignition as he already stated he has great spark. Have you got a noid light or a LED test light? Check to see if you have injector pulse on that side or cause its a VR lift the injectors out of the manifold but leave them plugged into the fuel rail and crank it to make sure you have fuel spray.
Highly unusual problem only other thing I can think of is a massive vacuum leak on that side?????
Got me stumped!

[Not_An_Abba_Fan]

The VR has a dual fire spark. When a cylinder fires on it's compression stroke, it simultaneously fires the opposing cylinder on it's exhaust stroke by firing both terminals of the coil with each revolution of the crank. The spark he sees may be from the other bank firing the coil, not from the one that isn't running. If the DFI wasn't getting a signal through from the ECU telling it when to fire it may only be firing one side, which will still send spark to the plugs but at the wrong times. (On the exhaust stroke). By making sure the DFI plug is clean and tight, it will eliminate this scenario.

[Cheap6]

Not sure about that, 'cos even if the signal from the PCM isn't being received by the DFI, the DFI will still fire the coils at 10 degrees BTDC.

Casso, how did you determine which cyls are working? Does pulling the injector plugs on the suspect dead cyls make no difference at all?

Blownba's suggestion of using a noid light/LED test light to see if there is power and earth across the injector plugs will tell you a lot.

There are two injector drivers (earths) in the VR PCM. The PCM fires 2, 3 and 4 together and 1, 5 and 6 together (auto.) so if it's only one bank, it's likely close to the injectors and is the power wire (unless you have already checked that there is power to each of the injectors).

If there isn't 12V at any of the injectors on one bank (I know you said you checked), I would try peeling back the black plastic insulation tape/convoluted tubing and looking for a short or break in the wires on the manifold.

If it's not just injectors on one bank, but two on one and one on the other, it will be an injector earth fault, either in the wire or perhaps the injector driver in the PCM.

[Casso]

Thanks for all the input fellers, it makes the GREYMATTER work a bit harder.
have used the light on all injector sockets,ok,tried another ecu, same.
dfi I have swapped, coilpacks, plugleads, plugs are wet so it's getting go juice, the way I determined as to which cyls were working was by feeling the ex manifold 1 and 5 are v/hot 3 is hot 2.4.and 6 are cold, pulled the dfi plug and pushed it back in so often that people are starting to suspect me of being a dfi sexual:-).,
tried all but the cas and I really get a pain in the botty if I've got to change that again.
Cheap6 Blownba, and notanabbafan,are giving me more to chew on than I had b4 also thanks to,Jules,sircruisealot, Ls1Ute.
Have spoken to a couple of dealer spannertwisters and also has them propagated,these blokes are Mates, so there's no way they are Yanking my chain.
Any of you fellers tell me as to where the loom from the injectors goes to? is it back to dfi or to ecu?? and what is the pcm???.the wiring is my next step as I know it'll be something simple as when ya park it at night and go out the next day and no go, it's gotta be simple, dont ya think, anyhow will keep at it thanks fellers really appreciate your inputs

[sircruisealotVS]

the loom from the injectors goes straight throught the firewall (drivers side) into the pcm from memory (the pcm is your ecu...they just call it a pcm because it also controlls the transmission, not just the engine).
hope you have some luck finding the problem man.

[Casso]

well back to IT tonite, still nothing, although now it's backfiring through the throttle body, somebody please tell me it's not the C.A.S

[Casso]

btw must inform that it is not a VR but a VN with the VR engine, any help

[Not_An_Abba_Fan]

The back firing would lead me to believe it is the harmonic balancer. It may have slipped causing the timing to go way out.

[Casso]

Fellers, thanks for all the input and I think you're all GREAT!!!!!!!!!!!!!!!!!!!!!.
Guess what was wrong???????????, I got caught the same way way, way ,way back in the 60s with a MK3 Zephyr a set of K.L.G plugs my new set of N.G.Ks **** themselves, without even doing a 100K.
What else can I say but,DOH,DOH,DOH. Thanks again fellers