My new TSi

[snipingkills]

So I bought a 95 TSi AWD a week ago today. When I bought the car it had a low vacuum. Being new to the turbo scene, I didn't think a whole lot about it at first. I was also boosting about 10psi peaking at 11psi on the stock boost controller. This seemed about normal as well.

I pulled the BCS off the car in order to do the free mod for another 2psi. After removing the BCS, I realized the free mod was already done.

Both of these signs pointed to a vacuum leak in the system. Since I have been pretty busy trying to get my 98 RS back up and running, I haven't done any troubleshooting until tonight.

I had a friend pull the codes and found a P0170. After some searching, it turns out most people replace the HO2S. Me being frugal decided to look at other measures before I started throwing parts at the car.

I found a wonderful thread on here for the Taboo Speed Shop vacuum diagram. I looked over this for some time before I ever popped the hood on the car.

The P0170 told me that there was a lean condition on the car. I decided to attack the FPR first. Within a minute of following vacuum lines I found the first cracked hose. Cranked the car back up and still had poor vacuum. So I traced a bit further on the FPR vacuum lines and found quite a large crack in the vacuum line. After cutting off another inch of vacuum hose and reattaching it to the car, I started it again.

18in/hg of vacuum at idle now instead of 10in/hg. Feeling quite pleased with myself, I went out for a test drive. The car now holds about 14psi instead of 10psi and peaks out at 15psi instead of 12psi.

I am still quite happy that this was a simple issue to resolve and look forward to spending more time this week on the RS without worrying about the TSi.

 

[Locke]

Rock on brother Enjoy the TSi

 

[snipingkills]

Definitely enjoying the TSi. I really want the RS back though. It's so tossable. The TSi needs suspension. Just doesn't feel right.

 

[TjPhillips36]

A boost leak test may be a simpler fix instead of tracing all of the lines. It will also show if any couplers/intercoolers hoses are also leaking and causing a weak vacuum. 18in/hg seems pretty low still I think.

A tester is pretty easy to build, and just need a small compressor to do it.

Fix all the boost leaks, and then maintenance, maintenance, maintenance!

Good luck!

 

[snipingkills]

The BLT is coming soon. Just wanted to trace a few lines tonight. The car is almost stock. Injen intake, crushed 1g BOV and a cat back. I've had it for a week and I haven't had much time to do anything with it. I want to get the RS back on the road soon so I can find a second job to feed my car habit.

 

[nyTalonTsi]

Beast. Normal idle for a mostly stock is 20in/hg. 18 is better then 10, so its not that much off. Mine moved around between 17-20 during idle.

Keep up with it, have fun.

 

[snipingkills]

Guess I need to see about replacing some more vacuum lines. Thanks though.

 

[viprez586]

18inHG is good, 20inHG would be excellent - perfect compression.

Do a compression test followed up with a cylinder leak down test to really determine your engine's health.

 

[snipingkills]

Will do. I'll work on that after the RS is back on the road. Just trying to keep things simple this week. On-call for work right now and I can't have the TSi down for too long. I picked up about 10' of vacuum line tonight and some oil. Did the oil change already. Will work on the vacuum lines tomorrow hopefully to see if I can get rid of the P0170 without buying a new HO2S.

Thanks for all the input so far. It is all much appreciated.

 

[snipingkills]

Awesome. I managed to break a door handle. I guess I should head out to the junkyard later and get another one.

 

[400hp93talon]

u need to purchase some bigger injectors, 2g pistons r pretty strong so they will last a while runnin lean but i would get it tuned asap!!

 

[eclipseracer13]

yea i broke my passenger side door handle on my 95 gst a week after i got it . I was so pissed and the junk yards where i live dsm parts are gone in like 5 min, so i had to order some from ebay. It cost me a total of $25 . And then everything wen down hill from there and im currently trying to get it back up in running