2002 audi tt quattro not hitting full boost
10-17-2017, 07:24 AM
#11
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Alright I'll look into the boost gauge and as far as black smoke goes it wasn't doing that but I did notice alot of black build up on the exhaust tips that seemed more excessive then normal but that was before I had the new turbo installed and I will definitely let you know asap my friend and if it is in limp mode and there are no possible problems with the car then what do I need to do do I have to take it in? Also to keep in mind the smog pump wasn't working before the shop said it was coming apart but it still works so they squeezed it back together and it's been fine since but I still plan on changing it and also the car keeps telling me service every time I turn it on but obviously I do all my own service but could this cause the car to go into limp mode since it keeps telling me to take it to survive?
10-17-2017, 07:39 AM
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well i really can't tell you if that would cause it or not but I would maybe check out about blocking off the sai and evap stuff to cancel it out
10-17-2017, 07:45 AM
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Alright sounds good I will do this all this when I get home and let you guys know what happened and what I found if anything. Thanks alot you guys I'll get back to you guys real within a few hours. 
10-17-2017, 06:47 PM
#14
I have done this exact same boost test but I also disconnected the pipe to the intake manifold at the bottom and tried sealing it as best as I could since people say not doing that will let pressure blow by the throttle bottle should I retest again without disconnecting the intake manifold?
10-18-2017, 10:08 AM
#15
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Alright so update on the boost problem there is for sure no boost leak anywhere but I did buy the boost gauge which btw thanks for telling me about getting it at harbor freight lol and I revved the car up and it wouldn't go past 5 psi which means it's in limp mode also the EVAP system has no pressure at all my dad was there with me when I was working on my car and while he was looking around he noticed the little tag on the EVAP pipe that says the system needs 1 psi and he checked it with a pressure gauge and it read 0 even with the car on and revving it he said there didn't seem to be anybuild up of pressure could the car be in limp mode due to this and if so what do I need to do to fix it?
10-18-2017, 12:34 PM
#16
Alright so update on the boost problem there is for sure no boost leak anywhere but I did buy the boost gauge which btw thanks for telling me about getting it at harbor freight lol and I revved the car up and it wouldn't go past 5 psi which means it's in limp mode also the EVAP system has no pressure at all my dad was there with me when I was working on my car and while he was looking around he noticed the little tag on the EVAP pipe that says the system needs 1 psi and he checked it with a pressure gauge and it read 0 even with the car on and revving it he said there didn't seem to be anybuild up of pressure could the car be in limp mode due to this and if so what do I need to do to fix it?
SAI only functions for a minute or two to fire off the cat converters after a cold start. If pumping is inadequate it can yield a code but I have never seen it but a car in limp mode. Unfortunately it's just about impossible to diagnose without a VAG com scan.
10-18-2017, 05:45 PM
#18
From Ross Tech. Mine is a Hex Can version. Can do unlimited # of vehicles. New units are limited to 3 or 10 VINs unless you buy the pro model for $$$$.
I would get the 10 VIN unit because as time goes by you'll use it but the 3 VIN unit WOULD work for your current needs. Remember that it requires a Windows laptop. Over the past 7 or 8 years mine has paid for itself over and over and over. On newer Audi's it is required to reset the maintenance interval requirement warning.
https://store.ross-tech.com/shop/vchv2_ent/
I would get the 10 VIN unit because as time goes by you'll use it but the 3 VIN unit WOULD work for your current needs. Remember that it requires a Windows laptop. Over the past 7 or 8 years mine has paid for itself over and over and over. On newer Audi's it is required to reset the maintenance interval requirement warning.
https://store.ross-tech.com/shop/vchv2_ent/
10-19-2017, 09:12 AM
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WAIT before you go out of your way in trying to get it scanned, there is a VCDS alternative scanner, it's called the VAG401 by Xtool. I got it on Amazon for 50 bucks and it's the best investment i've gotten. It has almost all the regular VCDS capabilities plus a little, it has a few special features that can come in handy sometimes too. I would HIGHLY reccomend
10-19-2017, 09:17 AM
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WAIT before you go out of your way in trying to get it scanned, there is a VCDS alternative scanner, it's called the VAG401 by Xtool. I got it on Amazon for 50 bucks and it's the best investment i've gotten. It has almost all the regular VCDS capabilities plus a little, it has a few special features that can come in handy sometimes too. I would HIGHLY reccomend