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Re: audi a4 1998 1.8 turbo quattaro
I don't know of any procedures written up out there that will guide you through an entire engine swap. What you could do though is to subscribe for your car at www.alldata.com ($25/year). It's an online service manual/troubleshooting guide, comparable to what the dealerships use, and using its information, I'm sure you could either find a mostly-complete tutorial, or at least piece it together using procedures for removing axles, transmission/differential, cooling system, and replacing the engine bay harness - a cluster of such procedures would piece the process together.
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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.
General rules of thumb:
Low speed engine on acceleration with smoke in the exhaust plume = worn piston rings
High speed engine accelerating (spooled up turbo) with smoke = oil form turbo bearing and/or piston rings
Engine on over run (coasting down, foot off the gas) with smoke = oil from valve guides.
VW/Audi make good engines with tight tolerances so none of the above should apply at 62K miles; just make sure that the oil (the right oil) and oil filter are changed regularly.
Engine also smokes when car driving if turbocharger still faulty. Did you change the engine timing belt (the timing belt kit) meantime? What about engine oil consumption? When engine glow plugs (one or more) burnt then engine exhausts white smoke at idling. Also white smoke at engine idling when water is still present in diesel fuel.
A dump valve replaces the recirc valve. Did you see the reply to your prior post on this topic that I put up the other day? You can do it but it'll cost you your catalytic converter and O2 sensors - that has been proven out many times in the past. If you don't care about that and don't mind spending $1200-1500 every year or 18 months to replace those parts, then go to www.audiworld.com or www.audidiy.com and look in the tech areas - there are step by step procedures there that walk you through recirc valve replacment. They'll show you how to fit an aftermarket recirc valve, but you can follow that procedure to do a BOV as well.
Seriously though, as I said before, some cars are fine with BOVs but Audis are not. You're going to cost yourself a LOT of money just for the sneeze sound and slightly slower turbo spool. Your car and money though so it's your decision.
Sounds like a failure of the engine coolant temperature sensor, which is a known weakness on the B5 chassis Audi A4 (model years 96-01). The sensor is relatively inexpensive ($20-30) and if you call up ECS Tuning (www.ecstuning.com) or Pure Motorsports (www.purems.com) with your VIN number, they can send you the correct sensor (there are three types, identified by color of the connector - black, blue, or green). Changing it is somewhat of a pain due to its location, but it can be done in 30-40 minutes. You have the 12 valve 2.8 V6 - take a look at www.audidiy.com and www.12v.org (two dedicated Audi sites) - there are a ton of tech procedures on those sites, and you'll likely find what you need there - a detailed, step by step, photo-referenced procedure on how to change the sensor.