MBC not working?

[GSTdude06]

I just bought a mbc and boost gauge and got them both hooked up exactly how it said. And it is turned all the way down but it says it is still boosting at 15-20psi on a T25 turbo. What would cause that? When it gets that high the car doesn't boost correctly. I don't know whats going on and any help I will thank.

 

[GSTdude06]

It was hooked up the same why all along not backwards and yes I did put my exhaust on first because I was running just cat!

Thats why you dont know the whole story so dont talk please....

I listen to oldman he knows what he is talking about Ill find my leaks soon enough

 

[eclipsh]

Easy there, we're all just trying to help you out. We don't know everything about your car or you so we have to make some assumptions. None of us are obligated to help you or share our time. Please keep that in mind.

 

[oldman]

Easy there, we're all just trying to help you out. We don't know everything about your car or you so we have to make some assumptions. None of us are obligated to help you or share our time. Please keep that in mind.

This is right, be thankful and respectful of others who take time out of their lives to help you as no one is obligated to, not to mention it was me who made the assumption that you had the hooked up backwards. To be honest I would have given up on this thread 2 pages ago if it wasn't for Nick's timely intervention, twice in fact. Now Let's put our pride away and focus on fixing your problem as that's the reason why we are all here on your thread, Get back to that leak test ASAP and we will figure from there.

 

[GSTdude06]

And im thanking all of yall but im not gonna mess around with something unless I needs to be messed with thats all im saying, and im thanking yall for yalls time cept when someone gets smartelic...... thats all im saying

Ill get to the test ASAP

THanks

 

[eclipsh]

Awww Oldman, you're making me blush (and that sounds really disturbing if you read it out loud.)

 

[green_bread]

im not gonna mess around with something unless I needs to be messed with thats all im saying

umm... ... if you are referring to the boost leak test that has been suggested to you throughout this thread...i dont know what else to tell you. it definitely needs to be messed with and has been pretty much pegged as the reason for your problems-other than the wastegate actuator-all along...

and im thanking yall for yalls time cept when someone gets smartelic......

and wow... i am sure this was referring to me... if you took my post as being "smartelic"... im sorry...i was just trying to help you out....you just get waaaay to distracted by the other discussion when you should be focusing on your boost leak test FIRST... you said you had your tester made several days ago... why havent you done the test? its probably one of the easiest things you can do with a DSM and it will probably help you out a lot if it doesnt fix your problem.

the best way to save yourself time AND money, in my opinion, is to start with the simplest solution and work from there....

im not saying im an expert by far, but i feel like i am able to help out in at least some way most of the time. im not going to waste time trying to help out someone who isnt going to appriciate the help of others, however...

with all of that said, GSTdude06, if you were referring to me in your posts, im sorry we got off on the wrong foot, dude... really, im just trying to help you out here!

ADAM

 

[eclipsh]

*cough cough* Drop it. *cough cough*

 

[GSTdude06]

its all good....

now..


I did some thinking about what I have done in the past to my engine and I thought about the little restrictor you can take out on the wastegate thingy for a extra psi or 2 and now that I thought about it the problem started after I did that....

soo....

I put it back in and took my MBC off and plug the hoses back up to how they were and then I reset my ecu and then took it for a drive....

Everything worked great at first, I could floor it perfect boost all the way through then after about 20 minutes maybe it started up again......

Poped the hood and I can see now that I have a coolant leak on one of the hoses going to the turbo..... that be the problem?

Or is it still leaks?



Thanks for the helps people!

 

[eclipsh]

Well that depends on what kind of boost readings you were getting.

Also, are refering to the boost pressure solenoid (black thing plugged into wiring harness) when you say you removed part of it?

If you are getting normal boost levels (10-12 psi) and still having problems then it is either:

1. A boost leak. Your pressure test should have found all of those if done right.

2. Ignition issues, likely meaning worn out spark plugs or wires.

3. Fuel issues. You could have slightly clogged injectors or orher fuel issues.

4. Bad sensors. You could have a poorly working O2 sensor or something else.

I'm feeling lazy so I didn't reread this whole thread to see what you've added/replaced as far as ingition etc. goes so if you have new parts installed ignore that section.

 

[GSTdude06]

Well im going to remove the "black thing with a plug on it" wastegate thing and hook it back up the other way...

Waste gate hose to mbc with BOV to mbc....

I no I have a leak at the BISS screw and I just got the O-Ring in as far as other leaks im still testing.....

 

[eclipsh]

*sigh* Did you read my last post? What boost levels are you getting?

You have to stop changing things until you figure out the problem. You are adding more variables and making it much harder to find the problem. Stop modifying it until you have everything fixed.

 

[GSTdude06]

its not modifying it its goin back to the stock way....

and ive stated numbers of times it messes up around 15 16 17 psi......

and that only happens when I try to floor it

 

[eclipsh]

I did some thinking about what I have done in the past to my engine and I thought about the little restrictor you can take out on the wastegate thingy for a extra psi or 2 and now that I thought about it the problem started after I did that....

f you have the plug put it back in and keep this attached. THIS is the stock setup, not the MBC.

I put it back in and took my MBC off and plug the hoses back up to how they were and then I reset my ecu and then took it for a drive....

Everything worked great at first, I could floor it perfect boost all the way through then after about 20 minutes maybe it started up again......

OK, so the car was running fine for a while. Did your peak boost levels change?

Poped the hood and I can see now that I have a coolant leak on one of the hoses going to the turbo..... that be the problem?

Or is it still leaks?

Thanks for the helps people!

Fix the coolant leak. It is a problem. It probably isn't causing this but it could kill your turbo and engine.

So do all the things we've been suggesting you do, including replacing broken parts like your wastegate actuator and keep the MBC (NOT STOCK) off the car until this issue is fixed. Like I said, more changes = more problems.

Also go buy yourself a pocket logger. It'll help diagnose all sorts of things that are wrong.

 

[eclipsegsxgirl]

if anyone knows where to get a good mbc that would help. also i have found out that autometer guages are awesome. i have their phantom boost guage, and have had no problems. its also very easy to hook up. all you need is speaker wire. no cheap kind.

 

[GSTdude06]

it only pumps up to like 5 psi.....on my gauge.......boost leaks?