[urq] Hard starting from cold

[Ashley]

Evening all.
On top of my on-going A6 woes I’m still struggling with a hard starting quattro (and as of today, a failing clutch master cylinder – I’ve clearly upset someone!). Compression is fine, normal running is fine, colour of plugs is perfect, emissions test results were fantastic (As good as a new car – just been tested). Once running all is fine. Battery is new but it won’t fire up from cold without a fight (lots of cranking, then cranking with WOT, and then it fires). Injectors are new, as are injector seals. Starter motor is new. I don’t think I have a vacuum leak because if I lift the dipstick when running the engine note/revs change noticably).
I am going to fit a new rotor and cap and will do a fuel pressure test  because I am starting to think it might be a low residual fuel pressure issue but I’m not entirely convinced.
I have a spare fuel accumulator (part number 447133441) which came off a coupe quattro but is a bit shorter in its main body than the one on the WR. Does anyone have any experience of running an urq with this smaller accumulator? Is it advisable or not? What’s the downside?  I have looked it up and it was run on some Audi 200s which suggests to me it should be OK.
Besides what I have planned , anyone have any other suggestions how to win the cold starting fight? Hot starting is fine....almost first turn of the motor.
Cheers

Keith

‘87 WR (under siege from Audi mechanical failures)