Question about 1991 Audi 80

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Audi 80e 1991 hard starting when cold

When the car is cold in the morning it very hard to start although the engine turns over easy. When it eventually starts it run at 900rpm which it maintains hot or cold. A new start temperature sensor was fitted on instruction from a mechanic, yet no improvement.

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  • kmlivesey Jul 05, 2008

    Where is the check valve in the fuel line located? Thanks for your advice.

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I've owned the same car. Check that the fuel relay 'primes' the system before you start the car. When you turn the key to the on position (all you dash lights, ready to start) you should hear the fuel pump run for a second or two. If it doesn't run you can replace the relay for about $30. If the relay is not the problem, it may be a check valve within the fuel line to the engine. This valve keeps fuel from draining back to the tank when the car is sitting. That way, there is fuel close to the motor when it's time to start. The temp senor was not a bad shot, they were thinking it was bad sensor not telling the cold start injector to run. Obviously not the case. However, the injector itself may be faulty in some way. As long as the car always starts, it's one of these problems, assuming the ignition system and engine mechanicals are in running order.  good luck. JK

Posted on Jul 05, 2008

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