gshaffer

I just finished doing a hose job, I was getting primary turbo only beore the hose replacement. Now that I'm finished I have no turbo at all. I realize that I re-connected something incorrectly but I'm looking for guidence as to what that might be and I hope it doesn't involve pulling the UIM again. If you have any ideas please let me know


Thanks

DaedelGT

Start here:

http://www.autosportracetech.com/RX-...leshooting.htm

Zyon13B

Get the hose diagram and recheck. Use the colored one.

911GT2

Hate to add to the pain, but thats pretty much all you can do. It sucks that you went through all that work and now have to go back through and check things.

If you're getting no boost I'd start with intercooler couplings and hoses. It's probably not a control system issue since you're seeing no boost at all. You may have not tightened one enough or one may have split. Good luck!

gshaffer

Yea 911GT2 that was it. The bottom intercooler hose blew off (didn't tighten clamp enough). I was hoping the hose job + fixing some hoses that were incorrectly routed would solve my problems. Just went for a drive and my boost pattern is now 10-5-7. It was 10-5-5 before so something changed. Still not right though. I'm running out of things to try. Anybody have any ideas?

Quickfini

iTrader: (6)

Check your wastegate and precontrol solenoids. You may have reversed those accidentally.

If you have them reversed, you would get somewhere around a 10-6-6 boost pattern. Check that one out. One of them should have a white dot on it.

911GT2

I'm glad you found the problem.

Straight from autosportracetech's website:
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Other Stuff

Wastegate and Turbo Pre-Control Solenoids

If you are getting a solid 6 psi from 4,500 RPM up, Check the electrical connections to these two solenoids, as they can get mixed up while working on the engine. From the front of the car, the right hand solenoid and the electrical connector of the engine electrical harness have a painted white dot, these two go together. Note that over time these painted white dots tend to dissapear.
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I'd try swapping those. I know you're not getting sold 6 psi, but you're getting really close to 6 psi. Might be worth a shot.

911GT2

beat me to it

gshaffer

I switched the solenoids and got 10-5-5. I knew they were hooked up right because I knew about the white dots.

Herblenny

iTrader: (13)

I know I been saying one way valves to everyone and I'm sure people are sick of me saying that.. but Iwould check all your one way valves..

I had secondary boost problems for almost a year.. after 4 vac jobs.. and doing other people's vac jobs.. It tends to be the one way valves.. take them off and make sure air goes thru one way and not clogged.. When I did mine, I had 4 of them were bad.. after just the valves, I got 13s on both turbos..

My current problems is avc-r.. for those of you who cares.. My primary wasn't kicking in.. and all the boost came on at 4000rpm.. I noticed my avc-r was flickering and all the sudden hit 0.. now it seems to be working ok.. so crazy.. avc-r replaces the precontrol and wastegate solenoids.. I have no idea how it works..

Juancm5483

Does anyone have a diagram of the airlow path for these check vavles/one way valves? I want to check mine but I do not know if the airflow path is correct because I have no idea what the air flow path is in the first place.

Herblenny

iTrader: (13)

also the path is on the inside of the hood..

Or you could go by this way.. the one attatched to the pressure chamber, the arrow will flow to the pressure chamber and ones attatched to the vac chamber, arrow will be toward the UIM..

hope this helps.. If not let me know, I'll find you a diagram.. I think its in the service manual also..

Cihuuy

yeah... a diagram would be great!

I forgot to put my one way check valve on the wastegate/precontrol solenoid and i dont know in which direction it should go. boost is still at 7-5-7?? tanx in advance

Herblenny

iTrader: (13)

here is the diagram..

Just in case you can't tell which way the valves are pointing..

The four (4) by the UIM, the arrow points towards the manifold..

The one connected to the pressure chamber is the only one that the arrow points toward the pressure chamber.

Hope this helps..

wstrohm

herblenny,

What about the check valve near the circled "K" in the "green" pipe? Which way does it flow?

Thanks!

---- Bill

Herblenny

iTrader: (13)

O.K.. Pretty much all the one way valves on the rats nest arrow points toward the UIM.. except the on on the pressure chamber..

So, the one you are talking about points to UIM..

gshaffer

After finishing another project tonight, I'm going to check all my check valves. I replaced three of them when I first got the car so I'm not too hopeful. The above vacuum diagram shows a check valve to the left of the circled H. The one I have (the big one) doesn't show this. What hoses does this check valve hook up to? It's kind of hard to see. Is it possibly only on AT cars?

gshaffer

I just checked all of the check valves except the one I mentioned above which I don't have and don't think I should have (MT car). They all seem to be ok. The one to the pressure tank is a little hard to blow through but it is less than a year old so it should be OK, And the silver colored one hesitates when I blow through it but passes air easily, When I was doing the hose job I checked all of the solenoids by blowing into them and then applying voltage. They all opened up after applying voltage but a few of them passed a small omount of air before applying voltage. Should they all not pass any air when closed?. Anyway, if you have any ideas, please give me some input. Sure, I could pay an expert to fix it, but I get much more satisfaction by fixing it myself and learning in the process.

gshaffer

Does anyone have an answer on the check valve mentioned above?

cruiser

Did you check your cats ? Maybe your cat is clogged. I also had 10-5-7 boost pattern, but after installing a DP and intakes I get 12-8-12. No sweat

Mahjik

iTrader: (1)

The one by the 'H' is for Automatics only.

As for the check valves, you should be able to ONLY blow through them in ONE direction. If you can blow through them in both directions, it's not functioning properly.

gshaffer

I have installed a downpipe and replaced the main cat within the last year. Didn't change anything. Cruiser - what do you mean by "intakes" Did you replace your LIM and/or UIM? I don't understand how that would help. Yes the check valves only pass air in one direction, so they are all OK.

Coop D'Vil

What about the pills in your lines to the wastegate control solonoids. When you did your hose job did you replace those with a free flowing line. It sounds like your wastgate is opening to early and both those line restrict flow to the control solonoid to keep the wastegate closed longer........thus more boost.

gshaffer

The pills are there. This is getting to be a real pain in the ***. I have been working on the car off and on when I have time for a year now. I have fixed several things that were definately wrong with it, and still have pretty much the same boost pattern (a little better since the hose job). Is it possible that it is the turbo it'self? Thanks everybody for your input so far.

Coop D'Vil

I doubt it is the actual turbos. It sounds like you are just losing boost somewhere, if it was the turbos i think you would see a less consistent boost pattern. Anyway I assume you have checked all of your intake connections and if there is no leak there, i would say it is either a BOV or wastegate bleeding boost. Probably a BOV seeing that there are two wastegates (correct me if i am wrong, i am still a newbie) and i doubt they would both go bad at once.