Audi A4

Tiny
PEPPE
  • MEMBER
  • 2003 AUDI A4
  • 4 CYL
  • 2WD
  • MANUAL
  • 62,000 MILES
Hi I am having problems with my 2003 Audi A4 2ltr petrol model. Problem when driving is the engine power fades but does not cut out as if there is no petrol, had the fuel filter changed still no joy could you please help me out. Thank you
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Friday, March 11th, 2011 AT 1:29 PM

9 Replies

Tiny
MHPAUTOS
  • EXPERT
I would say that you have a defective fuel pump, you better be checking the fuel pressure next.
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Friday, March 11th, 2011 AT 1:54 PM
Tiny
PEPPE
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Thank you mhpautos, I had a mechanic look at it and was told it could be the fuel filter he put a new one on but it is still the same. The AA pluged there computer in it but didnt show up any faults.I took it for a diagnostic test and was told that the fuel pressure sensor was showing up faulty but he was not sure if that was my problem. It happens when its over 2000 revs but does not cut out. Could you please tell me what you think. Thank you
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Friday, March 11th, 2011 AT 2:12 PM
Tiny
MHPAUTOS
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From my understanding of Audi, (i am no an Audi tech) the pressure sensor is just that a sensor that monitors fuel pressure, I would like to see what the actual pressure readings are as I do feel that you may have a defective pump or possibly a faulty pressure regulator.
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Friday, March 11th, 2011 AT 2:23 PM
Tiny
PEPPE
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Thanks again mhpautos for your reply would you go for the pump first or the regulator as the mechanic did mention the regulator but was not certain its costing me a lot of money so far without any results. Thanks
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Friday, March 11th, 2011 AT 2:43 PM
Tiny
MHPAUTOS
  • EXPERT
A fuel pressure reading and a flow test will show up any faults, a good mechanic can do a static pressure test to check the regulator operation, these really should be done, just trying parts with out a full diagnosis is just a waste of time and money.
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Friday, March 11th, 2011 AT 3:03 PM
Tiny
PEPPE
  • MEMBER
Mhpautos Forgot to mention that a steady stream of white smoke blows from the cars exhaust pipe is that information any use for you. Thanks for all your help.
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Friday, March 11th, 2011 AT 4:01 PM
Tiny
MHPAUTOS
  • EXPERT
Hmmm, this is important, this can be a sign of a head problem, white smoke is a sign of coolant in the combustion chamber, your mechanic can't be very good if he has not picked up on this, you will have to get a head check done, thi sis a simple chemical test for Co in the cooling system, if so you will have a head problem.
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Friday, March 11th, 2011 AT 4:04 PM
Tiny
PEPPE
  • MEMBER
Would that cause the problem I am having or is it another to the list. Thank you
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Friday, March 11th, 2011 AT 4:11 PM
Tiny
MHPAUTOS
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May very well be the cause of all your problems.
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Friday, March 11th, 2011 AT 4:16 PM

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