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[manny]

Are you sure it hasnt got a missfire?

[Omegafantasy]

It could be a misfire aye, just unsure what I can do to be sure about that. I have no spare DIS-pack that fits and sourcing one in Norway is unbelievably expensive (£250+).

[manny]

Then again you said all the plugs looked a good colour so maybe its not a missfire. Does it tick over nice and smooth.Have you checked for codes?

[Omegafantasy]

Yes, the plugs look brand new (not strange since it had major service before I got it). It ticks over nice and drives quite nice unless I floor it. It has some occasional stuttering at low rpm though, but I've never had a V6 who doesn't.

Just a sidenote: Why did they make the V6 so delicate and fragile? My old straight six (C30SE) seems unkillable, more power and torque to boot  :-?

[Broomies Mate]

Just a sidenote: Why did they make the V6 so delicate and fragile? My old straight six (C30SE) seems unkillable, more power and torque to boot  :-?

To be fair (and I've had both 2.6 Carlton and 3.0 Senator) the 3.0 Omega will leave the Senator for dead..... if it's working properly.

I concur that the Chain Driven 3.0 S6 is a more 'stable' engine, but it's lacks that sound of the V6

EDIT@  Sorry, I forgot to reply to your problem...... I'd suggest a cat has failed, hampering exhaust. 

[Omegafantasy]

Hehe, my Omega A (err, Carlton for you) would do circles around my (and my friends) V6, but the older one is a fair bit lighter too, and slightly modified (cams, fuel supply).

You're suggesting a cat and I won't disagree. Been thinking that myself, but I just can't figure out why I am able to rev it under load if it were blocked. It would at least explain the smoking hot exhaust.

My old Vectra 2000 (Cavalier) ate two cats in a year and I know how that was when blocking the exhaust.

Oh boy, if I have two melted/clogged cats I have to replace them with something.. Like pipes  :-/ About £1000 each here.

[Broomies Mate]

Hehe, my Omega A (err, Carlton for you) would do circles around my (and my friends) V6, but the older one is a fair bit lighter too, and slightly modified (cams, fuel supply).

You're suggesting a cat and I won't disagree. Been thinking that myself, but I just can't figure out why I am able to rev it under load if it were blocked. It would at least explain the smoking hot exhaust.

My old Vectra 2000 (Cavalier) ate two cats in a year and I know how that was when blocking the exhaust.

Oh boy, if I have two melted/clogged cats I have to replace them with something.. Like pipes  :-/ About £1000 each here.

My guess would be that at high revs, the pressure is sufficient to blast through the partial blockage.  At low revs, the blockage is preventing airflow.

Whenever I've heard of rear sections of exhausts getting that hot, it's always been cat trouble

[Omegafantasy]

If the cats are blocking, it ain't by much. I wonder what killed them if they're shot..

I have noticed a very very small leak from each manifold/downpipe joint, but that couldn't affect the lambda that much?

By inspecting the plugs I can only think of a lean mixture (slightly white ground electrodes). Changing the fuel filter today just to see..

[Omegafantasy]

Ok, fuel filter changed. No difference at all 

DIS-pack? If I only could test it somehow. It feels like really retarded timing. Could also describe the sound and movement like when the TC is active on snowy roads.

[Andy H]

I wasted time (and money) chasing a misfire on my first V6 because I ignored advice to fit new plugs.

The symptoms were that it would run fine at small throttle openings & low revs but misfire if I gave it too much throttle below 4000rpm.

When I fitted the new plugs it solved the problem. The old plugs looked fine until I compared them to new ones when it was obvious that the electrodes had been eroded and the gap was twice as big as it should be.

[Omegafantasy]

Well, I think those plugs are brand new. Could not see any erosion on the electrodes either, but sure it wouldn't hurt changing them. It's only £100 anyway, far cheaper than a DIS pack + leads.

When yours was misfiring, did you get a kick at 4000 rpm when the flap opened? My previous engine (X25XE) just changed character, no "nitrous" kick  :-/

[Andy H]

Well, I think those plugs are brand new. Could not see any erosion on the electrodes either, but sure it wouldn't hurt changing them. It's only £100 anyway, far cheaper than a DIS pack + leads.

When yours was misfiring, did you get a kick at 4000 rpm when the flap opened? My previous engine (X25XE) just changed character, no "nitrous" kick  :-/

My previous car was a 1994 car with the X25XE engine and manual transmission. It was a long time ago so my memory is a little hazy but I would say it 'changed character' rather than gave a kick in the back at 4000rpm.

[Omegafantasy]

Hmm, my Y26SE kicks a whole lot at 4k, but that might be because something is very wrong.

I just papercliped it (have no warnings though). It's showing a code 136 and the usual 31 (engine off). Code 136? Unknown Output Driver Error. What on earth could that be? The only thing I know I could get an error of is the lack of SAI (unplugged the 40 amp fuse), but that didn't give me an error.

If anyone is able to check; is the wiring for the injectors exactly the same on Y26SE and X25XE?

[Omegafantasy]

I reinserted the fuse for the SAI pump, but it didn't change my 136 code.

Been searching for info about the Motronic 2.8.1, but it seems like noone have reverse engineered it or have any other data. Most output drivers from the ECU have a fault code mapped up to it, but an "unknown output driver" makes me think a serious ECU fault. As far as I know, all electronics are connected properly. I mean; how hard can it be when I've only touched the loom on the engine itself?
I don't have a spare ECU to test with either and they are a rare find in this country Mine does not have immobilizer, thankfully

[Andy H]

If there are no warning lights I think that means it is a stored code.

Maybe a result of you unplugging things but no longer present?