200 cold start problems

[Geraint Lloyd]

Hi all

I have a problem with a CIS MCII audi 10v 1989

The car was not starting too well from cold. it was ok
ish, but not 
'special' it would catch after 10 to 20 seconds of
cranking.

when i bought the car in april, it came with a new set
of injectors, so 
I fitted them last weekend along with a new fuel
filter.

the car is now very difficult to start 1st thing in
the morning, you 
have to crank it for 40  seconds before it catches,
then it idles badly 
for 10 to 30 secs and is off....
the idle is ok,  1000-1200 when cold dropping to
800-900 when hot. the 
ISV buzzes nicely.
once te car has started once, it is fine for the rest
of the day, even 
if I only let it run (properly) for a minute and try
again half an hour 
later.

I guess that it must be fuel pressure.

so far i have checked

Injector leaks - OK
Sys presure 5.8 bar
cold control pressure - 3.2 bar although it wasn't
stone cold, but i 
dont think it's a CP issue so wasn't too careful there
resid pressure 3.4 bar afer 30 mins
check valve pressure 3.2 bar after 30 mins
i cracked open the cold start valve, and WUR
connectors after the car 
had sat for an hour or so, i got a spray so there's
pressure there.
cold start valve is getting 12v whilst cranking
the 2 black coolant temp sensors are giving the same
reading, although 
for the price i will change these v soon.
I lifted the flow plate with the pump on and the
injectors spray nicely 
(they are spanking so i guess that's normal) and shut
off without dribbling.


haven't checked the CSV flow rate, yet, but te car
starts ok when cold, 
but has already started the same day
I am about to test the WUR resistance, but am pretty
sure that it will 
be ok.

as i say, I guess that it's fuel pressure, but the
tests seem ok
I'm thinking
1 accumulator
2. pump check valve
3. temp switches (but not convinced)
4. stuck CSV, but the economy seems reasonable. I'll
pull it off in 
about 10 minutes

anyone got any better ideas?

oh and the AC compressor siezed last night. How do i
tell if it's R12 or 
R134?
will I have to change all of the o rings if it's R12?

ta
Geraint



 

-- 
Geraint Lloyd 
Montréal
People's Republic of Canadia
'89 200 TQA MCII
'87 Group N Golf 2 GTI, 8v, RHD

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