My 02 a4 I bought a little over a month ago has 150,000 or so on it and I'm planning on building up the engine after I complete the maintenance it needs. I have no service or maint. records so I'm not sure what's been done and what hasn't, so I'm prepared to get done whatever may need replacing.
So far I've thought of:
Basic tune up
Cabin Filter
Accessory Belt & tensioner
Timing Belt
Trans. Service
Power Steering flush (Wrong fluid in reservoir)
Heating & cooling system flush (No heat thinking its the heater core)
Compression Test

 

That list is a good start - I'd also inspect and/or replace all vac lines and check valves. They tend to be a weak link in the system. Also make sure other common vac system failure points (suction jet pump, etc) are in good shape.

 

I actually did notice a hissing vac line the other day that I had to patch up with some electrical tape!
I love the idea of replacing all lines and hoses in the engine bay, But I have a feeling that would be quite the load of cash as well.

Does anyone have a problem with lack of heat and demisting capabilities?
Should I flush my heater core etc.??

 

Actually, it's not that bad for the vac system, at least:

Check valves (roughly $1.50/valve):

1/4" Kynar® Standard Check Valves | U.S. Plastic Corp.
3/8" Kynar® Standard Check Valves | U.S. Plastic Corp.

Vac line (need 3.5 or 4mm, roughly $1/foot):

3/8" Kynar® Standard Check Valves | U.S. Plastic Corp.

 

That's awesome! Super cheap.
I suppose replacing them wouldn't be too bad. I'm just afraid I'll get in over my head and end up with a fudged up vacuum system.

Do you guys think the Emissions service kit from ECS is worth it? I believe you can get one for around $200, but some are $500 for some reason?

Emissions service kit from ECS:
OEM / Performance Parts for Audi, BMW, Mercedes Benz, Mini, Porsche & Volkswagen - ECS Tuning

 

Our kits are basically are for full over hauls (meaning it basically rebuilds the whole PCV system). All the kits include Genuine Audi parts which is why they might be on the more expensive side, not to mention there's over 20 pieces in some.

Jason

 

Definitely sounds worth it thank you!

 

After gathering a couple quotes this is what they want, Definitely doing the easier stuff myself.
Compression test & performance sparks- $169
P.S Flush- $133 (Seriously?)
Coolant flush (Just replacing fluid!) - $90
Trans Service- $100
Serp belt-$80
Vac Line replacement- $172-240

Most of these seem rather expensive. Most of it I would do myself with no second thoughts if i had a garage and fair amount of tools.

 

Replace the diverter valve during the timing job. You'll need to do it anyhow, and it's a lot easier with the front of the car opened up.