2002 Audi A3 carbon deposit

2002 AUDI A3
112,000 MILES • 1.6L • MANUAL
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RMACHEMER
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Hi,
Our car wouldn't start and we got it towed to the garage. They said it was the fuel pump and fixed it. They then said it needed an oil change and a new oil filter, we said ok, so they did that too. (cost 500 Euros) We went to collect the car and the oil light came on. They said the oil looks ok, and they couldn't see a problem on the computer so we aggreed to bring it back later in the week. It got about a mile down the road and stopped. We got it towed back to the garage and they said the oil pump isn't working and it may have done damage to the engine. They had a look (another 130 euros) and said there was a carbon build up.
We live in Portugal, so they quoted us more than the car is worth (1900 euros) to fix it. The oil light never came on before they "fixed" it. Is it possible that poor quality fuel could have caused the carbon build up as well as the broken fuel pumps and oil pumps? Is it a coincidence that the fuel pump broke straight away or could it be related to their "fixing our car?" and do you think it's worth repairing and how much should it cost?
Thanks,
Rebecca
Jan 30, 2014 at 10:13 AM
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JACOBANDNICKOLAS
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Rebecca,

The fuel pump and oil pressure are most likely not related. Is it the oil pressure light or a light saying you need to have the oil changed?
Jan 30, 2014 at 10:37 AM
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JACOBANDNICKOLAS
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Sorry, I had another question. When the oil light is on, is there any knocking or ticking from the engine?
Jan 30, 2014 at 10:38 AM
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RMACHEMER
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Hi, Thanks for the speedy reply:-) No knocking or ticking from the engine, but it did sound a bit different for a short time before it cut out. The light wasn't the low oil sign, it was another one - a red oil can.
Jan 30, 2014 at 11:46 AM
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JACOBANDNICKOLAS
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The idea that it sounded differently concerns me. When the oil pressure drops, it can cause a knocking and ticking in the engine due to a lack of oil to the engine causing major damage to the engine. I need to know if that is what is happening.
Jan 31, 2014 at 4:56 AM