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Hello a problem with my audi a4 18 turbo starting in the morning sounds like a diesal for a few seconds and when you toe it does the same noise and oil light comes on pls help.
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I'm assuming here that you are familiar with driving turbo engines. What do you mean by 'coming and going'? Are you losing boost as your driving or is it not building pressure as you accelerate? This sounds like it might be a 'boost' leak issue. This could be anything from a loose pipe clamp, a faulty wastegate set up to an actual turbo issue.
Give the turbo set up a basic check. Check all of the pipes and clamps to see if any are loose, split or damaged. A hole or leak in the system can cause pressure loss especially at higher engine speeds.
Is the turbo making any strange noises? Get a helper to rev the engine up to 3000 rpm and hold for 3 or 4 seconds and back to idle. Listen for grinding, hissing and rattling noises. Hissing at a steady engine speed suggests a pressure leak. grinding and rattling suggests a faulty turbo.
I would suggest taking it to a turbo specialist as this sounds like it will need to be tested 'under load'.
Hello everyone having similar sort of issues , any help would be much appreciated ,, trouble with my 04 plate a3 2.0 tdi , the car loses power in first and second makes a lot of noise but doesn't really go anywhere but if ease completely off and back on again the turbo kicks in properly it also won't go over 4000 rpm unless I go off and on the throttle any help would be greatly appreciated also I took the vacuum resivour pipe off whilst checking a few things and it cured it until I was cruising down the motorway and it just lost all power so I stopped and put vacuum resivour pipe back on and after about 15 mins the vacuum must have built back up again because it was back to just being useless in 1st and 2nd gear ..???????? Help !!!! I'm lost
You could remove the serpentine belt and see if the noise continues, then check each component one at a time. You describe a slipping belt because the alternator pulls hard for the first few seconds after you start the engine.
it could be low oil pressure. timing adjuster would make sounds all the time. if oil pressure is low it can make ticking or clicking sounds, and with turbo you need good oil flow.
you have a worn turbo bearing.I would get a replacment turbo before you do any damage.When you start the engine the bearings in the turbo are dry of oil.Has you start the engine the oil will reach the bearings and the noise will apear to go away.
Hi i have 02 audi a4 slimline. on motorway going 70 mph and to past a car dropped it down to fourth gear probly hit 90mph. Drove for a further hour and a half, and hear a bang under car. car started to loose power. was drivable but hissing noise come out of it when accelerating. Feels like turbo not kicking in. Would this be that the turbo has blown of maybe burst pipe or something. If anyone can share a light on this i would be very greatful. Cheers
If not that, could be a loose hose coming from the turbo. If it build boost and the hose is loose, it'll chirp. At least, it would on my turbo bike. Sounded like a balloon releasing air when the neck is pinched.
Hello, I used to own a 1989 audi 200 turbo. These cars have a rather complicated fuel injection system called constant injection system (CIS 2). They can be difficult for most mechanics to figure out, unless they are already familiar with it. If you do bring it to a mechanic, try to find one that is familiar with these cars. And don't be afraid to get a second opinion. I had one mechanic claim that my car needed several thousand dollars worth of parts, another was able to fix it for under a hundred. The only suggestion I have is that it sounds like it is vacuum related. Good luck!
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