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...


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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

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