I have a 2001 Audi A4, my oil light came on and i had to drive about 20 miles to nearest store where i put some more oil in but the engine contineus to make a banging noise and black smoke comes out of the tail pipe a few times, lightly.
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Re: Banging noise coming from engine
There are 3 possible reasons the oil light would go on. The 1st and 2nd reason would be due to no oil lubrication of engine components. This could be from a failed oil pump, or critically low oil level. The 3rd possibility would be a defective oil sending unit giving a false reading of a problem. You should always immediately pull over and shut the vehicle off if the oil light goes on, as driving the vehicle could result in severe damage to the engine. The banging noise you hear and the black smoke is probably due to a major engine problem, due to lack of engine lubrication. How much oil did you have to add to bring it up to full level?
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I am going to say 'blown turbo'. As I understand it, they needs replacing every few years. They are susceptible to heat and incredible revolutions. They have to be lubricated, the seals go, and you get smoke.
definitely an oil consumption problem. How many miles? Could be worn rings and or valve guides. The oil light on when hot indicates low level or possible or weak oil pump. Check compression for possible head gasket or cracked head. I wouldn't drive it untill diagnosed.
May be a little late but...check your oil filter for the long type not the shorter version for vw..With my 97 a4 if the smaller filter is installed at a lube shop it will set the oil light off.They both fit the audi but the smaller one lacks the oil capacity and starves the engine and sets the light off.Even a autoparts store clerk can make the same mistake as ive been there. they are said to be for the same application but are not. napa #1191 is correct for the 2.8 is the long oe version.
The CEL means there is a Diagnostic Fault Code stored in the Engine Control Unit. There are 1000's of DTC's, so you will need to have it read by a Code Reader. Auto Parts stores like Auto Zone, Pep Boys, perhaps even Advanced Auto often will read the code for you; but by law they cannot clear the codes. Many codes do not cause drivability problems, severe ones will trigger the ECU to run in a Limp Mode, which would require repair work before any trip longer than a few miles. Hope this is helpful.
Absolutely - the 1.8T engine is known for sludging issues. If they diagnosed oil sludge then your engine is covered no matter the mileage. The oil sludge builds up in the 1.8T no matter how well cared for it is, and the sludge can block the oil pickup screen on the oil pump (it's an extremely fine mesh), causing oil starvation and taking out the engine in the process.
Go to www.audiforums.com and do a search there for "oil sludge" and the information will come up. You can learn all about it there. But if your engine has the sludging, and you have receipts proving the oil was changed at the proper intervals, you will get a new engine free of charge - one of the members there is an Audi technician and I remember him posting that he'd changed out a 180k mile engine under warranty due to sludge.
There are potentially two different problems here. 1.A fault with the actual oil pressure. 2.An electrical fault with the switching circuit.
If you are confident the problem is not with the oil pressure, disconnect the wiring from the switch for a period of time. If the light still comes on periodically the fault must be with the wiring circuit shorting to earth. There will be no fire hazard to this approach as the voltage will drop over dash lamp.
However if the problem is with the oil supply system, the danger with this approach is you are potentially unaware of a serious problem
Such as the oil filter collapsed or the oil pressure release spring could be jammed open/closed which would cause the engine to not have the correct operating pressure.
THOSE NUMBERS ARE VERY GOOD, THE PROBLEM MOST LIKELY IS A DEFECTIVE OIL PRESSURE SENDING UNIT, HAVE REPLACED 100'S OVER THE YEARS FOR THIS SAME ISSUE, GREAT THAT U CHECKED THE PRESSURE THOUGH, IF THE LIGHT WAS INDICATING ACTUAL LOW PRESS U COULD HAVE WASTED THE BEARINGS IN THE ENGINE.
how is the oil level and pressure?, how many miles on engine? is this a loud knock or rather a clatter/ticking noise? knock is engine rod or crankshaft bearings, clatter loud ticking is valve follower noise. how long before it (the noise) goes away?