5000CS TQ Hot Start Problems

B Vibert blur at sympatico.ca
Wed Dec 4 13:28:43 EST 2002

Hi Jeffrey

Welcome to the land of quirky quattro's.   I had the same problem with
mine and it turned out to be a flaky fuel pump relay.  Give it a try,
quick and easy. YMMV

BTW, for $2500 did Werner Mastertek replace the whole car?

Burl Vibert
1987 5kcstq
Kingston, Ontario

Jeffrey Holliday wrote:
> 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
> leak.
> 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.
> Jeffrey

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