5000CS TQ Hot Start Problems

Jeffrey Holliday jeffrey_audi at hotmail.com
Wed Dec 4 09:12:19 EST 2002

Hello out there,
My name is Jeffrey and I own an 1987 Audi 5000cs Turbo Quattro.
This is my first attempt at this web site.
I am having hot start problems.
I have a Haynes Manual and the 2 volume shop Audi Shop manuals.
They are full of information and I have learned much from them.
The car is in real good shape because the one owner before me took good care
of it.
I bought it damaged from a used car lot and did the repairs to the body.
The car sat for about 6 months and would not start then.
I live in Aurora Co and decided to take the car to Werner Mastertek
They got it to start and run for about $2500.00
That was in Feb of this year.
About three months ago the car did not start right away after I ran into a
store. The car was on a steep hill and there was a low fuel tank.
I got the car level and then it took a couple of minuets of cranking to get
it to start.
I have had trouble since then.
I was hoping that someone out there had the same problem and solved it.

After messing around I thought that now it might be the accumulator.
The Haynes book says in the fault diagnosis that it might be:

warm control pressure too high or too low
sensor plate / control plunger faulty
Fuel or vacuum leak
leaky fuel injectors or low opening pressure
Incorrect mixture adjustment

I am real sure there are no fuel leaks and have look hard for the vacuum
The car runs great when it starts cold.
I was staying away from that sensor plate I was warned it is touchy
I pulled the spark plugs once and they were totally dry when I was hot
starting the car

The fuel pump works well
I have spark
The car starts right away when she sits over night or for about 6 hours and
totally cold.
Right now to get it to start hot I have to crank it about 20 or 30 secs
or more.
The starter will not take it much longer and the battery is going south.
I did have it in "storage" for a month at Werners but they said they want
2000.00 just for starters.
I am fairly mechanically minded and have the standard tools.
Please let me know where I could continue.
My current plan was to replace the thermo sensors that are on the cooling
manifold.  then I was going to get a new regulator.
Then perform more little tests.
I am hoping that it will not be the electronic control unit.
$1300.00 for a new one.

Thank you for your time.


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