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[tunnie]

Which is why for me, they should have developed the Straight 6 more as it was much more suitable DIY work wise.

I hear MarksDTM points of costs to GM, one engine for all, I see why they want to save costs. But from DIY view S4/S6 are a doddle to work on 

[Andy H]

Which is why for me, they should have developed the Straight 6 more as it was much more suitable DIY work wise.

I hear MarksDTM points of costs to GM, one engine for all, I see why they want to save costs. But from DIY view S4/S6 are a doddle to work on 

Straight six wouldn't fit in a wrong wheel drive car (OK Austin Land Crab/Princess/Ambassador managed it but that was a 'special' case).

DIY doesn't tick any boxes for the manufacturers 

Pedestrian safety does. Modern cars have a high bonnet and a big gap between the bonnet and the top of the engine so a child can head-butt the bonnet and leave an impression without reaching the solid engine. V6 can be made close to cube shape instead of long and tall like a S6. I still prefer the sound of a S6 

[Gaffers]

engine mounts? 

[Kevin Wood]

Which is why for me, they should have developed the Straight 6 more as it was much more suitable DIY work wise.

I hear MarksDTM points of costs to GM, one engine for all, I see why they want to save costs. But from DIY view S4/S6 are a doddle to work on 

The straight 6 was well outdated even by the time the 24V version had come out, though. It had developed through numerous different incarnations and was a bit of a boat anchor. Yes, you need to keep on top of cam belt changes on the V6, but as soon as you have chain issues on the straight 6 you are in a whole heap of trouble.

They needed to develop something more compact and able to meet current and future emissions regs anyway. Cav and Vectra would have floundered if only the 4 pot options were available so why would GM have funded the continued support of an obsolete engine in parallel to the V6 when it was minimal effort to use the V6 in the Omega, and improve its' handing to boot?

[Andy B]

....
The straight 6 was well outdated even by the time the 24V version had come out, though. It had developed through numerous different incarnations and  ....

IIRC the straight six appeared at the back end of the 60s (Commodore?  ) .... obviously with carbs & points in the dizzy

[Spireite]

MAF sensor possibly

[less]

I've had something similar to his before, when towing at high speed - turned out to be fuel starvation.
Changin the fuel filter sorted it in my case - might sort yours. When was your fuel filter last changed?

[Glyn]

Guffer
Engine mounts are OK.

Spireite
Maf sensor. I don't know how to check that.

Less.
Fuel filter. Very possibly I think, as I have never changed it in the five years I have had it.
 If when I next use the car (wish I had today as it chucked it down on wat to work and my bike is filthy yet again, after washing it twice last week. Useless weather forecasts) and its still the same after the oil top up I will try that. Probably do it anyway as I don't think there are expensive.

Glyn

[Gaffers]

I think the fuel filter makes sense unless it goes away when you go above 80 in which case it's a vibration problem hence mounts or propshaft balance

[Glyn]

I had forgotten to update this topic, so am doing so now.
It seems it was the fuel filter as since I changed it five or six weeks agoI have had no problems at all.
Accelerates well past 90 now smoothly and without stuttering.
Again a job that takes seconds to do, if you discount the ten minutes between taking
the old one off and clipping the new on, due to sticking my head under the tap to rinse all the
petrol out of my eyes .