A real head scratcher

[vg_ute_mad]

G'day Guys!

I'm pulling my hair out on this one!

In the last couple of weeks, my 6 cyl ute has been giving me grief. It idles ok, but I would be driving along as normal and then it will start to jilt as if it has a miss or as if it is starving for fuel. Then all of a sudden it starts to run fine again. And then plays up again. It only plays up a little during the day, though at night time it plays up more.

I have replaced the fuel pump towards the end of last year. And replaced the fuel filter, spark plugs, cleaned the throttle body and tipped a bottle of injector cleaner in this week, though no improvement.

Any idea guys????

Thanks heaps in advance!!!

[pow3rslave]

I'd guess you're using more power at night with all your lights on, so I'd consider looking at voltage drops, maybe start with alternator. On a different tack, how are your injectors

[vg_ute_mad]

I'd guess you're using more power at night with all your lights on, so I'd consider looking at voltage drops, maybe start with alternator. On a different tack, how are your injectors

Thanks for your reply!
The alternator is fine. I believe the injectors are good, because the jilt problem would be constant if the injectors were clogged, wouldn't it?

[VrWagz1]

What about your leads, give it a rev in the dark and look for high voltage sparks around the leads. I would consider replacing them anywayz if they are a bit old just as a cheap elimination of them possibly being the problem.

[centy]

If you have a mate with a similar car ask if you can borrow his coil packs and module for a couple hours and then swap them over and have a test.
Also check for a fault code.

[vg_ute_mad]

If you have a mate with a similar car ask if you can borrow his coil packs and module for a couple hours and then swap them over and have a test.
Also check for a fault code.

hmmmm, thats what I think it could be. Just curious, how much are the coil packs, new or from the wreckers?

[Emackulation]

I would buy a set of leads if yours are old, its good to keep buy new leads anyway, and if it fixes it then great! If not the leads then coil packs?

[pow3rslave]

ebay has them for s2vn -> vs for 45 dollars, i don't know what engine the vg has in it (s1 or s2) the coil packs are different for s1 (squarer) also before you go buying a new coil pack, it could also be the dfi.

i haven't pulled one apart so i can't elaborate, just that the dfi plate is under the coil packs, i think they work in conjuction

[88GreenVN]

The CAS could be on the way out too.

But the jolting while driving on the flat - turned out to be the DFI/coils on the 88wagon if thats any help.

[89 vn]

lol where do you buy this **** for $45 secondhand coils are almost as much as new ones and thats an s2 as well, i was lookin for one in perth and they are like 200$

Maybe $45 someguy ripped out of his VN to make/rip someone off cash

[vnv8driver]

If you have the cash, theres msd coils which can be bought individually that slot into the v6 style coilpack configuration.

[Emackulation]

If you have the cash, theres msd coils which can be bought individually that slot into the v6 style coilpack configuration.

You mean if you wat to waste some cash.

[vnv8driver]

yeah pretty much, but if you do that, thicker leads, a bigger gapped plug along with the usual memcal and exhaust mods you got yourself some extra horsies even if it is limited. I dont like stock coils they seem to wear out prematurely for some reason...

[vg_ute_mad]

sorry to take so long for a update. I got the injectors serviced, and still no luck. the problem is getting worse. Does anyone know how long the the warranty period is on fuel pumps?

[jas98]

sorry to take so long for a update. I got the injectors serviced, and still no luck. the problem is getting worse. Does anyone know how long the the warranty period is on fuel pumps?

maybe the fuel regulator?

[centy]

warranty would be 6 to 12 months. depending a lot on who put it in and were you got it from. try this link for coil packs and module
VS VT coil pack - eBay Ignition Systems, Ignition, Charging, Car Parts, Accessories, Cars, Bikes, Boats. (end time 16-Sep-08 09:58:49 AEST)

[vg_ute_mad]

warranty would be 6 to 12 months. depending a lot on who put it in and were you got it from. try this link for coil packs and module
VS VT coil pack - eBay Ignition Systems, Ignition, Charging, Car Parts, Accessories, Cars, Bikes, Boats. (end time 16-Sep-08 09:58:49 AEST)

That is very cheap! will it suit a vn donk?

[VrWagz1]

That is very cheap! will it suit a vn donk?

I dont know much about the v6's but id say no. They would be for the ecotect not the buick and im sure the vn s1 had different coils to s2 vn, but someone correct me if im wrong.

You dont know anyone nearby that you can just swap the coils quickly with to test them out, thatway if for some reason its not them, your not wasting any money.

[Joey_21]

id say the cas mine was doing this jolting and eventually started to stall every time u put it into gear its worse at night because the wires surrounding the cas despand and cause a bad connection when it heats up its not as bad but u will find in the next few weeks it will get worse

[vg_ute_mad]

id say the cas mine was doing this jolting and eventually started to stall every time u put it into gear its worse at night because the wires surrounding the cas despand and cause a bad connection when it heats up its not as bad but u will find in the next few weeks it will get worse

Yeah its getting worse. So is the cas coil pack?

[Joey_21]

CAS ud best change that before the coil pack but test the coil pack 1st before u go and buy i think cas is around 150 installed

[vq5ltstato]

when u got the injectors checked did u also have the fuel pressure checked that would eliminate fuel then u can look for electrical.

[vg_ute_mad]

when u got the injectors checked did u also have the fuel pressure checked that would eliminate fuel then u can look for electrical.

Sure did and the fuel pump was fine. They put another fuel pump in to be sure, and its still playing up.

I got a coil pack today from Pick and Payless in Blacktown for $60 and I will see how that goes.

[vg_ute_mad]

Sure did and the fuel pump was fine. They put another fuel pump in to be sure, and its still playing up.

I got a coil pack today from Pick and Payless in Blacktown for $60 and I will see how that goes.

OMG!!!! I put in another coil pack and another ECU today and still no difference.

What does a C.A.S actually do??????

[johnnie5]

OMG!!!! I put in another coil pack and another ECU today and still no difference.

What does a C.A.S actually do??????

Crank Angle Sensor tells the ecu what the rotation of the motor is so it knows when to fire the spark