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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'.
It is not the left turbo, there is only one turbo. IT is the LEFT turbo intercooler. Looks like a radiator. IT uses coolant from the cooling system to reduce the temperature of the turbo. They are about 100 dollars to apiece. You could drive it BUT if it gets bad you loose all the coolant and must stop or you ruin the whole engine.
Turbos wear out regularly, they are a high maintenance item and have many precision and auxiliary parts. You need to check the boost pressure and the wastegate.
What ,year audi and model? EPC LIGHT PO299. let me see if i can find out with out year and model. okay, if your car has turbo then this is correct, po299 low boost. this may be caused by a bad diverter valve on the turbo, if you remove it and look ay diaphram for any cracks or splits in rubber, if it is then replace it ,check for an update valve at dealer. there are other thing that can cause this code but start with that. a loose hose for the turbo can cause this code or bad turbo or clogged converter, or oil sulge problem.
the turbo is common on the tdi engine a fully recondition unit will cost you around £500, a second hand 1 will cost you from between £150-£250, but just be carefull as you will need the numbers from the turbo to match, good luck with this
Turbocharger around 950 Euro for Audi 1.8 T, and around 975 Euro for Audi 1.9 TDI. Manual labour costs around 80 ... 100 Euro. Please Rate my Response! Thanks!
It makes a big difference in acceleration. When the turbo spools up you will feel it in the seat of your pants. The turbo force feeds the engine air. More air means the engine can burn more fuel and more fuel means more POWER!!
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