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run the fault codes and look for a problem area in the vane actuator of the turbo
it could be a sensor problem or a MAP sensor problem
this is indicated by the pressures being generated or not generated by a turbo generating pressure from the throttle opening on acceleration or held at constant speed
16619 -Engine boost condition - Limit not reached. Check intake hoses/ connections for leaks. Check Turbo charger waste gate regulating valve/ waste gate working correctly. Must move freely when accelerating, won't achieve full boost if waste gate sticking open. Check Turbo impeller turning freely, oil feed pipe for turbo can get blocked causing impeller to seize. Engine compact, not easy to access these components.
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
Your V8 Audi has two necessary sensors that malfunction due to their placement in extreme heat on the lower left side of the engine just inside of the header/down pipe connection. They read the flywheel position for the engines computer ECU. The reference sensor is always suspect, but the speed sensor may need to be changed, as well. The wire connectors to the sensors that sit above the FL suspension can be tested, or just replace both sensors to get some quality time with your V8.
Likely a faulty diverter valve. If you have some decent mileage on the car the DV may be failing. It's a flimsy design with a plastic internal diaphragm. They're not terribly expensive (you can buy them at www.ecstuning.com or www.purems.com).
That being said, I'd still look around the turbo and intake systems for a loose, cracked, or disconnected vacuum hose - a vacuum leak should trip a check light but it may not always do so. Look for that, and if nothing is apparent, then I'd look at changing the DV.
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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