Question about 1985 Audi 5000 S

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We have a warm start problem with Audi 5000S Turbo 1985. Apparently gas is not available to car if engine is hot and turned off. Fuel pump seems to be ok. Was told it might be a valve in the fuel distributor. Is this the same as the EHA Valve (Differential Pressure regulator)? what could the problem be?

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If the car is ok when cold then it is a heat related fault. The first thing to look at would be the coolant sensor for the ECU (this is like the auto choke) it is maybe giving an incorrect reading.

Posted on Nov 18, 2009

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85 5000s starts every time when its cold. but start it for ten min shut it down. then it wont start. if I break open the gas filter relieve the pressure. it will start. sometimes the idle will surge up...


Check the BROWN ground wire where it attaches to the throttle body by a 10mm headed bolt.. Audi used a thread sealer here and it makes poor contact.

Check the fuel pressure. Should be 55 psi dropping to 25 psi or so when engine off after 30 minutes. If fuel pressure drops to near zero, warm engine start will be hard. This is caused by a faulty fuel pump check valve or accumulator ( Grey looking can under rear of car with two hard fuel lines to it.) Pressure should be checked before the fuel distributor.

The warm up valve ( WUR ) can also cause hard starts. It is on the side of the engine with two stainless braided hoses going to it. It can be rebiult by Larry at CIS FLOWTECH.

CIS FLOW TECH LLC19225 County Road 13
Fairhope
AL 36532-3687
Phone: (251) 929-0190
Category: Fuel Systems and Parts, Motor Vehicle


The intake trunking has a habit of cracking open between the folds and admitting false air as engine moves. .

Sep 22, 2013 | 1985 Audi 5000 S

1 Answer

Ok my audi has fuel no worried about a faulty gas gauge but its turning over but it seems like either te gas isnt comin to the engine or no spark it iust decided to not start after ibhad been driving it...


turn key but do not start car, listen to see if you can hear fuel pump start up if not its bad if so then try changing the fuel filter. the worst could be ignition modual out.

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1 Answer

1985 audi 5000s non turbo leaking ****** fluid


You have a leaking engine cylinder head gasket, coolant is entering the combustion chambers of the engine and being expelled out the tail pipe.

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1 Answer

Where is the thermostat at on it


The Thermostat will be where the bottom radiator hose joins the engine block. Bottom of block near crankshaft pulley.

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1 Answer

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This solution is 6 months after, so you've probably fixed the car, but here goes anyway.
The fuel system at engine must be free from vacuum leaks, to work.
Replace the hose. You won't hear the pump until the engine turns over....and then there's too much noise to hear it! No gas to motor is usually the fuel pump relay. Pumps don't fail very often.

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1 Answer

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Check the fuel filter, you may have clogged it when you filled the tank.

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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.

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