2002 audi a41.8t please help...

wait a while till you run it in
turbo boost should be low on a rebuilt motor at first

new rebuilt engines smoke till the carbon ring forms on the new head gasket

if not happy after a week check out the turbo

Get it back to whomever did the job. Or maybe take it to someone who knows what they're doing. Turbo line is obviously leaking. If it's not cranking even with a jump you may have seized he engine. 2.7's are not cheap!

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Bring it back to whomever replaced turbo's on your 2.7. They screwed up a connection somewhwere.

I’m happy to assist further over the phone at https://www.6ya.com/expert/howard_977676954994c5b2

Possible turbo, gasket, cylinder head ,gaskets there. Get 2nd opinion

Your mechanic is spot on. The A4's are notorious for turbo overheating and failure. The oil burn is coming in the TURBO itself and then being distributed to 2.3.4 as a side effect. Your not noticing blue smoke because your catalytic converter is doing its job and the minor smoke being generated is being taken care of in the CAT. If you continue to drive as is you will run a certain risk of catalytic converter damage, cylinder damage from fouling (cylinder wash) build up, sludge, etc. If your mechanic has the knowledge on this specifc model there is a way to test the turbo output and turbo heat generation to absolutely confirm. One last thing. in ANY turbo car its imperative to run QUALITY oils not your local wal-mart brand or no name. Many people are not familiar with the demands on a TURBO engine and oil change facilities pull standard oil from 55 gallon drums via a pump.. so you arent feeding your car properly. The AVG (Audi/Volkswagen) company recommends FULL SYNTHETIC and either Castrol or Mobil 1. I have a Turbo Diesel and use Mobil1 as my choice. The recommended oil for your car via their web page is Current Vehicle: Year: 2003 Make: Audi Model: A4 Quattro Engine Type: 4cyl. 1.8Liter Turbocharged
Mobil 1 0W-40
A fully synthetic motor oil, Mobil 1 0W-40 with SuperSyn Technology exceeds industry standards and the major leading builder requirements, enabling the product to keep performing well after conventional oils cannot. Mobil 1 is recommended by leading car manufacturers as initial fill

If somebody replaced the turbocharger with a new one, you must check up all command vacuum lines, the entire air intake system (air pressure pipes, intercooler, connections, EGR - throttle vane, ...), and also turbocharger and EGR command solenoid valves (three pieces). Could be also MAF sensor defective! Here you have the vacuum air pipes connection picture for Audi A4 1.9 TDI (AJM engine):
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yes the whole subframe needs to be dropped as an assembly to do this job..2.7t is an awesome engine but not very user-friendly to work on.

that's a major job, head removal and rebuild after a T-belt breakage, and hard to say if he has left something disconnected or mis-connected, or if it picked now for some other fault to develop. I've worked on those Daewoo c2000 2.0/2.2 16v GMH engines a bit, my friend bought a 1998 Leganza, I always figured them as a POS engine, frankly..he had more than one major problem with it, even though we avoided a T-belt failure.

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.

Not a recall. Find a head in the junkyard and have the valves reground.