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Audi S4
Repair Questions and Answers
Question: Audi S4,
2001, 97,000 miles, V6, 260hp. Hi all, I have a concerning question. My
audi was driving fine till my brother tried to drive it. I think he stalled it a
few times, and also revved it high I think. Immediately, I noticed a burning
smell and also some black smoke coming from under the hood. On inspection, no
specific parts undr the hood had any residual smell, but whenever I shift gears
especially lower, I think I'm losing a some power, especially pickup in 2nd
gear. I still drove 700 miles in the hwy with no major issues, but I still get
the smell. Is this something to worry about?....I feel its the clutch but would
like your opinion & advise.
Answer:
The brake pads may be glazed and causing
the noise you hear, normally if you work the brake and get then hot, the pads
will clear up, Do you hear the noise after heavy breaking? find a quiet spot and
give the brakes a bit of a work out and see if the noise goes away.
Question: 2004 Audi
S4 Question V8
All Wheel Drive Automatic 92,000 miles. During ignition, my car makes a
rattle and shake sound that is coming from the engine and the idle drops to
around 500 rpms. It only occurs for 3 seconds then after that it is fine. At
stop lights, the vehicle idle decreases slightly giving an indication that it
will stall but then goes back to normal. What could be the cause? Thanks Jeff
Answer: Does it
sound like rocks in a coffee can? ... Might be the catalytic converters
falling apart inside then jamming tight after the exhaust pushes the pieces
around. Any change in performance? Full of oil and properly maintained? Any work
done on the
car before?
Question Follow Up:
Yeah...actually it kind does....lol. I just had the
catalytic converter replaced under the 80,000 mile warranty by Audi in May of
2007! I don't notice any change in performance. I have maintained the vehicle
very well and check the fluids every 2 weeks. The only work done on the engine
was the new catalytic converter in May.
Answer Follow Up:
I would get under it and tap on the exhaust with a soft
faced hammer to see if the exhaust is rattling. Might be pieces of the old cat
in the muffler
Question Follow Up:
I brought the
car to a mechanic the other day and they said that the noise
seems to be coming from the inside of the engine. They did a 70 point inspection
and said I should bring it to Audi and find out what is wrong because they
didn't know. Should Audi have taken steps to make sure the pieces of the old
converter (if it is) be cleaned out before installing the new converter? Oh and
there is not a single sensor on to tell me if anything is wrong and I would
assume with a car like that it would.
Answer Follow Up:
The o2 sensor after the cat will tell you if the
efficiency is low (cat is bad). Sounds like this could be a timing belt/chain
tensioner problem. They will usually rattle first start up until they build up
enough oil pressure to hold tension. If this is the case, I would have it looked
at immediately
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