Question about 1986 Audi 5000 CS

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87 audi turbo cs 5000

Starts runs till turnerd off if left to cool off will start again

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  • sshroulote Sep 06, 2008

    could it be the fuel filter



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It is the fuel pump check valve. the part is cheap. i had the same problem. changed the valve, no more starting problems.

Posted on Mar 03, 2009

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Could be: fuel warm-up valve,
idle-speed stabilisation valve

Posted on Dec 28, 2008


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2001 Audi a6 that I am thinking of buying but owner said the left turbo is bad that when you push hard there seem to be steam coming from the engine what could that really be is it just the turbo that's...

It is not the left turbo, there is only one turbo. IT is the LEFT turbo intercooler. Looks like a radiator. IT uses coolant from the cooling system to reduce the temperature of the turbo. They are about 100 dollars to apiece. You could drive it BUT if it gets bad you loose all the coolant and must stop or you ruin the whole engine.

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My 86 Audi 5000 CS Turbo has quit running while driving but at stop signs or stop lights with no indication of anything wrong. When I try to start it again the battery is dead. I've bought batteries...


Sep 04, 2011 | 1986 Audi 5000 CS

1 Answer

Car revs up to 3000 rpm when I start it. I have unplugged the idle control valve and it makes no difference

It is an electrical relay problem, that is part of the EFI system, I had an Audi of about the same age with the same problem many years ago. The relay was under the dash to the left of the steering wheel. Sorry, can't be more precise, but the dealer at that time had the relay in stock and one mechanic at the dealer gave me enough info to find the relay and replace it, and that solved the problem

Apr 20, 2009 | 1986 Audi 5000 CS

1 Answer

Bucks at high ecelerations

May be going into overboost and the sensor cuts off the fuel. Is the boost guage reading higher than normal? If so the waste gate diaphram may be bad.

Mar 08, 2009 | 1988 Audi 5000 CS

1 Answer


If you go to ebay, under "audi 5000 87 ignition" you will see the full ignition block with new keys, and its only $49, and you can offer less since its best offer. You can check local junk yards, and parts stores, but you may not find the part due to the age, hope that helps

Feb 20, 2009 | 1987 Audi 5000 CS

2 Answers

Have a 1986 Audi 5000 CS Quatro that will crank but not start..

The ground? You'll have to be more specific. There are several grounds involved in starting the car. Whichever it is, it'll have to be repaired. This repair should be fairly simple -- replace the broken cable or clean the connection, then replace. There's no way to bypass the ground. Let me know which ground it is, and I'll try and look it up in the repair manual, and give you some tips on how to track it down and fix it.

Dec 11, 2008 | 1987 Audi 5000 CS

1 Answer

1986 Audi 5000 CD turbo cuts out when you punch it

That could happen from something as simple as an overdue air filter, bad plugs, or, unless you know it to be fresh, a failing timing belt, which could destroy your engine which I think is an 'interference' type that can have valves and pistons occupying the same space at the same time if the cam gets out of time.

Oct 08, 2008 | 1986 Audi 5000 CS

1 Answer

'86 audi 5000 turbo

back of throttle area ducting should be tight or worn collapesed hose causeing vaccum leak

Sep 24, 2008 | 1986 Audi 5000 CS

4 Answers

1987 CS quatro turbo

I had the same thing happen on our 1987 5000s and it turned out to be the fuel pump. I replaced the fuel pump and car was fine...until the next disaster.

Aug 18, 2008 | 1987 Audi 5000 CS

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