Audi 200 mc2 residual fuel pressure

[Louis-Alain Richard]

Hi Geraint,

I think you shouldn't worry about the mechanical condition of your car, it's
the fuel...

While I'm here in Atlantic Canada for vacations, the Saab (2001, 9-5 2.3
turbo with 150 000 km) is experiencing a very rough cold start in the
morning. But every other start of the day is perfect. Today, it was around
10 celsius this morning (50F), I had to crank her for 20 seconds before she
fired. I've spend the next 15 minutes on the web to find a solution since
I'm 1300km from home, with no Saab dealer in sight. If a part is failing, I
want time to get it here before we leave.

What I learned tru Saabnet and other forums, is that the summer fuel (low
vapour formula) is NOT suited for operation in the low temps we see these
days. Even one friend's Volvo 2001 V70 (Danny) had this very problem this
morning, the first time he see that on his car. It is abnormally cold around
here since a week...

I've also learned that premium fuel is worse, to the extent that Saab
dealers when confronted to that problem, suggest people to switch to regular
fuel until temps are normal. Same problem arise in fall before they switch
to winter fuel.

Maybe you can validate my last theory : I usually fuel my cars at
Petro-Canada (94 octane for the urQuattro, 91 for the Saab) or at Ultramar,
both of which are near my home. Ultramar is the provider of fuel for many
brands, including Petro-Canada, but except Irving. Here in Atlantic Canada,
Irving is the major supplier for fuel, and is the only one I use since 2
weeks. The Saab is hard to start since we arrived, but usually came to life
in a few seconds, except today's very cold morning. Is this related ? Did
you fuelled your 200 at Irving ? I'll have another data point tomorrow when
the temps should it 23C (73 F) for the remainder of the week.

I am sure a lot of people on this list will corroborate this summer fuel
problem. 

Your car is fine. It's the fuel.

Louis-Alain



-----Message d'origine-----
De : quattro-bounces at audifans.com [mailto:quattro-bounces at audifans.com] De
la part de Geraint Lloyd
Envoyé : 6 juillet 2009 16:22
À : quattro list
Objet : Audi 200 mc2 residual fuel pressure

Guys, still issues starting the car!

It's ok in the day but it's a bit hard in the morning.

I have fixed a nubmer of things and checked more! Including stuck  
carbon canister valve, misc air leaks

Residual fuel pressure is 3.2 bar after 20 mins, 2.8 bar after an hour  
and 1.4 the next morning. Is this normal?

Csv is not leaking

Check valve swapped and no change

Injectors are 2 years old with 29k miles ish

No puddles of fuel under the car

New fuel filter

Runs rough with the dipstick out

Duty cycle at 40%

Everything clicks and buzzes durin the output tests

During the day it fires after 2 or 3 cranks then tries to die for a  
couple of seconds then is fine

Any ideas

Geraint





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