neg19psi at idle pos4psi at WOT

[89DodgeSpirit]

well my wastegate lines were replaced - no restrictor in them now

All but the wastegate solenoid line.

I think I have a vacuum leak or my boost gauge is messed up - I have it t'd off the little line on the throttle body - it sits at negative19 at idle and when I start accelerating it will go up near 0 and if I floor it it goes to 3 or 4. But never over that... at any RPM

I think I heard before a sort of "whistle" from the passenger side of the car in the compartment but I am not sure. Would a leak in the wastegate solenoid line cause low boost or do you think I have a leak somewhere else? Or perhaps my gauge is miscalibrated (even though it is an AutoMeter and was checked for calibration)

Do you have anything else (ie grainger valve) installed? Have you made sure your actuator is working correctly? If you have a vacuum line going from the turbo to the wastegate, and nothing else, you shouldn't get over 5psi. From what I've read you need that restrictor.
Try making a bleed (or use a 'grainger valve'), and do away with the computer's control. It sure made a difference in my van (if you haven't read that yet). Best $9 I've spent!

Oh yhea.... as for the guage. I have the same (autometer) and it's T'd off the TB's small port. I haven't had any problem with it. If you're getting 10-13psi you'll know it!

[89DodgeSpirit]

ok thanks man - I gotta go find that restrictor... what size is it? I checked the actuator arm and it moves freely and I can hear the spring compressing... from what I understand I need a small hole in the vac line from the turbo nipple to the actuator and a resistor???

And can I just unplug the wastegate can for now and see if my boost goes up (I don't care if I come close to overboost, just want to make sure that all is well) - edited in - no point the wastegate line is only seeing a max of about 4psi as well

[89DodgeSpirit]

My Stock BOV line is broken... I don't know where it starts from (where it T's off of for pressure)

Can anybody fill me in so I can block it off to see if that is where my boost loss is coming from?

A better diagram (like from a mechanic's book or something) than the one under my hood would be appreciated! I was trying to trace this line under the hood but could not find where it starts... Diagram is no help.

oh I forgot to answer your question - I have a T in the wastegate line that goes to the wastegate solenoid.

I am going to be graingering but I want to at least get stock working 100% before I try going beyond that =) I have 1 month and 2 paychecks before that 1/4 Mile with a Grand Prix GT 98 =)

EDIT IN:
I went outside and removed the cover from all of my plastic vac lines and could find no leaks... I even sprayed very fine mist of soapy water over all of em at idle to see if engine calmed down - no reactions whatsoever. I found that there is the small nipple that comes off the turbocharger compressor housing to the Wastegate line and a big ass one that comes off the housing to the blowoff valve in the stock airbox. Well the small vac line that goes to the BOV I cannot find where it starts from I just found a broken end of it under the hood. I un-hooked the big hose from the airbox at idle and felt nearly nothing, no vacuum no boost, revved and still felt pretty much nothing. So the way I figure it either my boost is going somewhere else or it is not making any boost? Perhaps my wastegate is bad? I know that when I am driving I can hear the turbo spool up and the gauge does go up but then it seems like it stops spooling (gets real quiet) and the gauge goes back down.

*cries* maybe the wastegate lines are causing trouble without that restrictor? Bad wastegate solenoid? What do you think? Plz be as specific as possilbe in responding! I wanna go to 14lbs!

MikeD QB: I can hear a sucking sound... maybe it's a blowing sound...
MikeD QB: sortof a hiss
MikeD QB: sounds like it's coming from behind/under the intake manifold
MikeD QB: but I cannot pinpoint it
MikeD QB: so I am pretty sure i have a nice sized leak
MikeD QB: just cannot find the ****ed thing

Thanks

I'll look at my van's BOV vacuum lines later and let you know..... they should be the same as your's. It might come from the other port on the turbo.... closer to the output.
If you remove the wastegate line you should get to cut out (if the actuator is working). Give it a try! Even better... try appling (no more than!) 5-10psi to the actuator. See if moves it's full swing open and closed. Give it a little help with your fingures and feel for hang ups.... that's what I did for mine. (no compressor?... try mod'ing a bike pump!)

[glhsken]

19" of vacuum at idle is good. Your issues are entirely vacuum line related. The mitsu should be plumbed from the compressor outlet to the wastegate.

an open bov would cause your issue. The turbo cannot generate maore than 3-4 psi pressure due to the leak. Take your time and trace every line.

[89DodgeSpirit]

I unsheathed all of the plastic vacuum lines and they are all still in good shape no leaks... I hear a leak from behind/around my intake manifold but I cannot locate it... Any vacuum lines that run around or behind that that I should specifically check? I think the BOV small vac line runs back there which would be my problem...

[89DodgeSpirit]

I unhooked the Wastegate line and still I get vacuum unless I go WOT.

I am 99% sure my vacuum leak is from the line that is supposed to go to the BOV in the airbox... Somebody PLEASE help me find it's source. Because that line is broken stapped clean and I followed it as long as it went. It went down and behind the block/manifold but I cannot track it anymore because it is broken! *Begs* Please somebody help me find the source of this line!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

[glhsken]

http://www.thedodgegarage.com/turbo/turbo189.jpg

That is the vacuum Diagram... I would print it and trace all your lines.

[89DodgeSpirit]

seen that, tried that, no luck

The vacuum line that is going to the stock BOV doesn't seem to be on this diagram... either that or I am blind...

I know where the line I am looking for T's off of... but when I go there and go to the T it runs to two dead ends that are capped off...

So I have a broken vacuum line on a quick release valve but I cannot find the other end of the broken line anywhere... From the way the old line is molded from heat I can tell it ran down and behind the box and then to the left somewhere but I cannot find where...

I had my headgasket done not too long ago and they had to undo and redo all of the vacuum lines so it may be that this broken vacuum line was simply removed or a T was added with a cap or something I really have no idea... But the two lines I foudn with caps look to be original from the factory...

So I need somebody please to go thru the effort of tracking this small little line for me.

Or at least giving me some insight on how to find a vacuum leak... I tried spraying a mist of water at all the lines and no results from that...

I am only getting 3/4 PSI boost on my wastegate line, 3/4 pounds of boost on my Throttle Body small line, 3/4 PSI boost on my brake booster outlet hose during boost... And that is rarely (only when I floor it)

So basically I am running a non-turbo MPI 2.5.... Not exactly my idea of a Turbo Dodge.

Sorry if I seem upset - I am - I want to fix this so I can install my G-Valve and up my boost and install my intercooler & new BOV I have sitting here in the floor behind me.

It was suggested to me that maybe my intake manifold gasket is bad/removed because I recently had headgasket done by a shope and maybe they didn't replace it... Well I am getting 19 inches of vacuum off the Manifold side of the throttle body at idle so I think that my seals between the engine and the TB are good otherwise I wouldn't be getting 19/20 inches of vacuum...

My problem is in the boost going from the turbo to the TB somewhere... It is leaking out of a line that is dedicated turbo (like the wastegate line is... it never sees vacuum) Otherwise my vaccuum at idle would not be 19" (boost leak causing lower boost - vacuum leak would cause lower vacuum as well)

Anyways there is a vacuum line that goes to the "Quick release air valve" right outside the airbox and from that it runs inside to the big plastic junky stock "BOV"... The big huge "vacuum" line from the "BOV" in the airbox that goes to the turbo is good... I pulled it off to feel about 2/3psi... Now the little vacuum line is broken and I cannot find it's origin... Since it is a source of pure boost I am guessing that it could be my leak that I am experiencing. (AKA Open Blowoff valve AKA massive boost leak AKA no Turbo Boostin)

Now if somebody could please take the time and trouble to trace this little line for me I would GREATLY GREATLY GREATLY appreciate it! I will do whatever is necessary to get my car boosting again just short of paying money (because I have none)

So if you can help me out PLEASE *I BEG YA*

Thanks!

Mike

Have another look at the diagram above... it shows you just where the line should go. If it came off somewhere you should see it.... it might be the line right on the turbo's output side (the big hole plumbed to the TB).

[glhsken]

That is the issue.. Your lines have been re-done. It is impossible for people to TELL you exactly where it should be plumbed over the internet.

The proper line routing is in a dashed off box upper right hand side of the diagram. That is the best anyone can do for you.

JUST route the line to somewhere that sees vacuum/boost and hook it to the bov. Either that or cap the bov completely so it will not leak then test it.

Then using the diagram, re-do the lines correctly.

[89DodgeSpirit]

Yeah sorry - I was very sleepy and getting aggravated... if it comes down to it I will re-do all lines with rubber... What sizes do I need? I will probably get like 20 feet of each size so I don't run out or have to go get more...

The most fun part will be running the lines for all of the solenoids LMAO

What should I do about the "orifices" on the vacuum diagram?

I'll keep you guys posted I guess =)

[89DodgeSpirit]

I re-did the throttle body lines... the plastic part that goes to the fuel vapor canister is still plastic because it runs under my A/C stuff and I didn't have time to bother with it tonight. I am going to probably sometime in the next week install the intercooler & BOV... Before that I will take the intake hose off of the compressor housing on the turbo and check for play... And after that I will start the car up without the hose and see how well the turbo is spinning.

I will then install the IC and redo all of the vac lines.