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1

Omega General Help / Re: Omega V6 - Stalls @ 1k RPM/ Won't Idle

« on: 04 October 2015, 09:11:40 »

Ok little update to this.

We changed the maf, ordered the correct ICV pipe from germany still no difference to the high idle so we were at a loose end.

Ended up buying "My Naff Code Reader" to see the live data from the sensors and low and behold our isse was shown as soon as it was plugged it, at throttle close the TPS was showing a value of 4.78v with the simulated full load switch = active with the simulated idle switch being inactive.

Unplugged the TPS sensor and the idle went down to 600 RMP, with a little hunting, so plugged in a TPS sensor we had lying around and the voltage read 4 volts but turned it to where it was at near zero, and the idle switch was now active and the idle was a steady 600 with no issues apart from the slight hum/ vibration from the G cams. turned it up to where it would report the 4v and low and behold our high idle was back.

Turns out the rod that connects into the TPS sensor on the TB that was attached to the long plenum is rotated 90 degree's from the stock one on the x25xe that we removed, also the flap open in the opposite direction so when at WOT on the long plenum TB the car is registering 0% throttle, so needing to refit the old x25xe Tb to rectify out issue and the old meega will be back on the road

2

Omega General Help / Re: Omega V6 - Stalls @ 1k RPM/ Won't Idle

« on: 19 September 2015, 02:13:58 »

little update with this.

Fixed the ICV by properly plumbing it into the front trumpet of the plenum as it should be, connected up the egr valve and then started the car, and now it seems to idle at 1500-2000, we did unplug the maf which seems to have some effect as the idle drops to what we would expect, still not perfect( drops to 800-1000, still try's to stall but the car won't allow it but does dump a load of fuel into the exhausts, plug the maf back in and the idle rises back to the 1500-2000 rpm.

The above does point towards the AFM being faulty, but as it ran fine before the work was carried out we can;t see how its just went fubar, think what we are going to do is remove the plenum again( will have to come off as one of the rocker covers isn;t sealed properly so is dripping oil down the back of the engine so its needing reseated) and just check all the pipes and what not that are down the rear of the block as I positive i can hear a slight blow from down the back but we can;t see anything that is disconnected or that can be causing it.

Will try and keep you guys updated as to what we find, as we will get to the bottom of this eventually.

3

Omega General Help / Re: throttle cable for long plenum?

« on: 18 September 2015, 13:18:56 »

ours doesn't seem to reach, unless we need to force it through a little bit more?

4

Omega General Help / throttle cable for long plenum?

« on: 15 September 2015, 10:40:56 »

Hi there again.

As some know fitted the long plenum from the 3.0 v6 to our 2.5 but as a consequence the throttle cable no longer reaches the throttle bodies.

Just wondering if anyone knows the part number for it ( seems there's quite a few) or even have a link to one?
Its for a manual if that makes any difference.

5

Omega General Help / Re: Omega V6 - Stalls @ 1k RPM/ Won't Idle

« on: 14 September 2015, 12:01:51 »

The crude method is just an extension of the factory pipe so that it reaches the shorter plenum pipes, unplugging the pipe the car just stalls not long after starting.

All seals are present and correct, everything plugged in bar the egr as per above.

We did initially try to start the car with the afm disconnected but it wouldnt fire, but that was just after rebuilding and priming the engine.

6

Omega General Help / Omega V6 - Stalls @ 1k RPM/ Won't Idle

« on: 14 September 2015, 01:15:05 »

Reaching out for a little bit of help here, got a little issue with our 1996 x25xe omega.

Little background first, car did have a misfire and tick on idle when we bought it which we thought was a dead injector or tappet, but we were going to work the top end anyway for a lil bit more power.

So we've carried out the top end rebuild by fitted 2 sets of "g" cams, 3.0l lower divider, 3.0L litter fuel rail/ Manifold, 4.0 bar FPR and a long plenum, timed the engine up( what a ball ache that was) and she fired up after the first few cranks, all was well, but at that point we didn't have the AFM plumbed in( was connected but was just so we would start the car to hear it running), the Multi-rams were unfitted as were most of the vac pipes heading towards the rams, the ICV pipe work was also un plugged( ICV was connected to the plenum but due to fitting the longer plenum the original pipe work no longer reached so was left unplugged), but she ran, did run a lil rich but she was running, that was a few days ago.

Since then( or tonight) we have put the multi rams back in, connected all the vac pipes, got a rather rough/ crud method of plumbing in the ICV into the plenum trumpets and we started her up, she idled at 2k for a while but once she warmed up the rev's continued to rise till she idled at around 3-3.5k and at this point was bellowing smoke out the back( smelt of rotten eggs mixed with petrol) so assumed the cats had died due to the rich mixture. At this point we scratched out heads as everything worked before fitting the 3.0 parts, so we assumed the parts fitted to the 3.0 long plenum were faulty( starting with the ICV) so swapped that over, and sure enough the idle was more "steady" and more inline with what we would expect, but more importantly the fuelling was back on track and the smoke had ceased, but still wouldn't idle properly, once it came off the warm up cycle the rev's would start to drop and then get to around 1k and then the engine would spit and sputter then die, so we then swapped the throttle position sensor, again the rev's seemed a little better, but would still stall when the rev's dropped. at this point we changed the solenoid and valve which operates inside the plenum( at the back) with the old 2.5 one as the 3.0 one was rather dirty and did come with a cable tie attached to the mech which we didn't know what it was for so cut it off, but we knew the 2.5 one was great, but still no success on getting the car to idle under 1k.

Even removed the ICV completely and all that did was just stall the car after starting, so were assuming that the ICV's fine.

Which brings us to where we stand atm.

We have done the paper clip test and got the following codes.

144   Immobiliser No Signal
145   Immobiliser Wrong Signal
73   Mass Air Flow Sensor Voltage Low
33   Exhaust Gas Recirculation (EGR) Valve Voltage Low
31   No Engine RPM Signal

33 will be due to the EGR being unplugged due to again teh 3.0 long plenum not using a different opening/ pipe so its plumbed into the union but not plugged in so its not operating atm.
73 we're assuming as we did originally forget to plug the AFM in after rebuilding the car.

31 has thrown us tho as the RPM on the clocks work fine.

SO now we're at a loss, when the car is running it runs great, we just can't get it to idle without applying a little throttle to keep it above 1k, and the idle issue only seems to start after all the vac pipes were plumbed in and the air box and everything else put back in place( all vac pipes and solinoid/ control units are plugged in where they should go)


Any help will be greatly appreciated as we don;t really know what could be causing it apart from possibly the aggressive lift of the G cams, but would have thought the momentum of the flywheel would be enough to keep it going at least.

7

General Car Chat / Re: So what have you done to your car today?

« on: 11 September 2015, 13:41:49 »

Started putting things back together 

8

Omega Electrical and Audio Help / Re: Electric memory seats.

« on: 05 August 2015, 08:54:26 »

96 pfl estate,

fl

I assume you changed over the seatbelt tensioners plus informed your insurance company regarding the SRS system

The Preface lift doesn't have side airbags( so thats not an issue), and the pre tensioners are mechanical on the PFL seats compared to electrical on the FL seats we have fitted, we may look into transplanting the pre tensioners over but atm its not a critical component in the project.

9

Omega General Help / Re: x25xe tuning parts.

« on: 16 July 2015, 00:59:40 »

well we have 2g's and 2a's in our possession or will do this weekend.

The other guy working jointly in this prodject was at billing at the weekend and got talking to a few guys we know and they happen to have a few V6 spares knocking about including another set of G cams, long plenum, 3.0 inlet divider and possibly some 3.0 manifolds, which they are bringing up to the Scottish car show for us this weekend

10

Omega General Help / Re: x25xe tuning parts.

« on: 09 July 2015, 13:02:33 »

not after out and out power, got a stage 3 astra VXR for that, but generally just want more grunt from the V6, and being the estate it needs all the help it can get, if we can get it above the 200 mark I'd be happy

will add the exhaust manifolds to the list, guessing they are more free flowing than the 2.5's? also got a 3.0 lower plenum divider on the list.

as for the rechips, seen a guide on here as to how to do them and looks fairly straightforward, but can't seem to find anywhere reliable that sells them, always a bit weary of ebay sellers and ECU chips, how much would I be looking as for a ecu chip for the x25? cruise economy may make it worth while however as the car will be doing a 4500 mile road trip next year.

11

Omega General Help / Re: x25xe tuning parts.

« on: 09 July 2015, 11:35:33 »

Hrm, didn't think you'd be able to do that, that opens up many possibilities

12

Omega General Help / Re: x25xe tuning parts.

« on: 09 July 2015, 10:33:54 »

What year is it? There may or may not be a mantzel type power box forsale on a well known auction site for the early style inlet set up. Or am I not allowed to say that?

It's a 1996 omega, what's the power box?

May look into an engine swap in the future but not sure how it will work as the cars not drive by wire so may have to have to be the 3.0 for simplicity.

13

Omega General Help / x25xe tuning parts.

« on: 09 July 2015, 00:47:28 »

HI guys/gals.

As some know recently picked up a 2.5 v6 estate and well, it could be doing with a little help under the bonnet power wise .

Been doing some digging and picked up a few bits and pieces to get me started but obv don't really under stand how to actually get the best from the engine, already got a set of G and A cams bought for the car which seem to be the recommended combination.

Read posts about the 3.0 lower plenum, guessing that's the black bit that sits just above the intakes to the heads?

Any other bolt on engine bits that would be recommended such as the 3.0 throttle bodies etc ect?

any help or pointers for parts/ upgrades would be greatly appreciated.

14

General Car Chat / Re: So what have you done to your car today?

« on: 07 July 2015, 01:17:55 »

Picked up a near full black fully heated front/ rear interior( boot trim/ carpet, door trims, door cards, heat rear bench, front fully electric memory seats, centre console + switch for rear heated seats plus some other bits and pieces) from a facelift estate to be fitted to our prefaclift, still got the roof lining and floor carpet to pick up at a later date.

15

Newbie Welcome Area / Re: Hello there.

« on: 06 July 2015, 03:09:17 »

Certainly will be an adventure.

Got a year to get the car ready plus adding some touches, do also plan on adding some more power to the car so long as it remains in or as close to the budget we have, which should be capable as we plan on doing all the work ourselfs and sourcing parts from all over. Already got a set of black leathers from a facelift estate which would look better than the cotton or whatever material the seats that are in the car are made of.