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Discussion Starter #1
I searched through old threads, and from what I saw on the subject, they were all unresolved.

So just yesterday I noticed that my boost gauge wasn't pegging to where it normally would. I was only seeing 10psi of pressure.

This morning I verified that it isn't the IPD gauge with Torque. :(

I just picked up a Mityvac, so that I can check my wastegate settings, and also got some silicone tubing to redo my stock(yes, still stock
)

I'll be checking my IC couplers and hopefully redoing the lines tomorrow, but what other things should I look for?

At idle, the gauge typically sits at ~20Hg, and returns to 0 when the car is shut off.

I have a brand new TCV hooked up appropriately and in the car, as well as the ViVA CBV with the yellow spring. I also have the MTE stage II tune.

Every once in a while I've felt almost a hiccup while accelerating. The coils and plugs and MAF are all new as of last summer. Trying to think of how a boost/vac problem can cause a hiccup feeling, I'd imagine it's more of a fuel/spark issue.

Anyways, for anyone who's dealt with a similar issue, perhaps you may have suggestions for me?
 

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Clean your maf, replace your vac lines. Easy to do and will most likely fix it.

Other options are:
Crack in the turbo
Faulty MAF
Faulty BPS
Boost leak somewhere
Clogged catalytic converter
 

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If you figure out what it is let me know lol. I've been at 9-10 psi since I got car. Checked lines and hoses. Tried new tcv valve cleaned maf. New plugs and coils. Haven't checked wastegate yet. Car seems slow.

I think a couple of other people were having same issue. Never heard anybody fixing it. I also took it to a dealer and they said it was running fine.

Sent from my ADR6425LVW using Tapatalk 2
 

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Discussion Starter #4
Clean your maf, replace your vac lines. Easy to do and will most likely fix it.

Other options are:
Crack in the turbo
Faulty MAF
Faulty BPS
Boost leak somewhere
Clogged catalytic converter
Hmm...I have the Phuzzy DP with cat in my car. I'd imagine the cat would be fine. But I suppose I can have a shop take a look at it, when they remove my resonator.

I feel like I've just cleaned the MAF recently too, but I'll do it again, it's easy enough!
 

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same boost issue here. wont go above 10#'s. New plugs and coils, cleaned MAF, new silicon lines with no visible leaks and new DP(cat). I plan on checking MAF readings in the near future as well as FPS and BPS to eliminate those sensors as well as IC hoses before looking into the turbo (please baby jesus no haha).
 

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Hvaing similar issues as well, I have all brand new silicone lines, new TCV, new MAF, checked intercooler piping, confirmed wastegate is set at 6psi. Just got a new Lenovo Ideapad and got it up to VIDA requirements. Hopefully buying VIDA soon so I can check the other sensors and do some data logging.
 

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I am in the process of resolving my low boost issue as well as I am waiting on a part. I diagnosed all the normals as listed above. I ended up measuring the resistance on the IPD TCV and I got nothing. That means that my tcv valve is fried and I need a new one. If it breaks, the valve will run "open" so your car should be seeing whatever boost your wastegate is set at (~6-7psi). My boost gauge from IPD is not as accurate as a digital so I first saw around 10 and then when I really looked at it, it was more around the 7 mark... which would make sense since my wastegate would be set around there.

So I ordered the new IPD TCV and it is currently on it's way to my front door. When I get it, I will replace and update my thread. I am almost sure that is the resolution to my issue. It lasted about a little over a year and some of them dont last long at all.

So I did not catch which TCV you have... which one?
 

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Hmm...I have the Phuzzy DP with cat in my car. I'd imagine the cat would be fine. But I suppose I can have a shop take a look at it, when they remove my resonator.

I feel like I've just cleaned the MAF recently too, but I'll do it again, it's easy enough!
Do you have a Phuz intercooler? If so, is it one of the earlier ones that came with sh*tty rubber couplers for the cold side piping? If it is, I would start looking at the rubber couplers, because Matt (Phuz) recently posted about finding a split in one of his original rubber couplers: http://forums.swedespeed.com/showthread.php?173461-DIY-FMIC-and-Charge-Pipe&p=1901376#post1901376

FYI, if you run the car with the electrical connector to the TCV unplugged your peak boost should be approximately equal to your wastegate pressure setting, i.e. if you unplug the electrical connector to the TCV and you see a peak boost of 5 psi at wide open throttle, then your wastegate pressure is about 5 psi.

Cheers,

Jeff
 

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Discussion Starter #9
Do you have a Phuz intercooler? If so, is it one of the earlier ones that came with sh*tty rubber couplers for the cold side piping? If it is, I would start looking at the rubber couplers, because Matt (Phuz) recently posted about finding a split in one of his original rubber couplers: http://forums.swedespeed.com/showthread.php?173461-DIY-FMIC-and-Charge-Pipe&p=1901376#post1901376
It's an earlier one, but I'm pretty sure they're all silicone couplers. I have a tear in one, but it's not leaking. It's been there for a year now without issue.


So I did not catch which TCV you have... which one?

It's an OEM TCV. I suppose I could toss the Phuzzy one back on for a check this weekend as well.
 

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It's an OEM TCV. I suppose I could toss the Phuzzy one back on for a check this weekend as well.
That is why I originally replaced my TCV because I was running at higher pressure with the tune... the phuz tcv should actually do better than the IPD TCV Version 1... since the IPD TCV Version 2 looks exactly the same as the phuz.

Hope you figure it out this weekend!
 

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Discussion Starter #11
Yeah, any time I'd clear a CEL or reset the ECU I get crazy spikes. So I swapped back to the stock TCV.

It's just weird that everything was fine up until yesterday. I hope it's just a leak in something easily replaceable, and not let's say, the turbo itself.
 

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Discussion Starter #12
The red line off of the TCV, it goes to the turbo compressor nipple(giggity!), should that be able to hold vacuum/pressure? I'm testing the lines with a mityvac to see if they're able to hold anything. The red one does not.
 

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Discussion Starter #15
Right on.

I thought the red and blue lines aren't supposed to hold pressure.
Yeah, the blue is fresh air, so I was assuming that wouldn't hold any. I was also assuming that the red one wouldn't. The yellow one has to though. And it does in my car.

Looking like it *might* be my brand new OEM TCV.....I had a temporary code for it. Going to pop the phuzzy one back on.
 

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Not the TCV.....hmm.

I'll flash it back to stock tomorrow and see what I get.


Now the interesting question: Could it be the wastegate?
Doubt it's the wastegate, and this sort of thing is almost never the tune. Check your BPS, sometimes the screw that holds it in place backs out a little bit causing it to not hold a seal and it creates a boost leak.

When you put the TCV in did you do the readaptation procedure?
 

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Discussion Starter #18 (Edited)
Doubt it's the wastegate, and this sort of thing is almost never the tune. Check your BPS, sometimes the screw that holds it in place backs out a little bit causing it to not hold a seal and it creates a boost leak.
Cool. I'll check that tomorrow.

Edit: Actually, where is that? Looking at a picture of it, it looks like what I thought was the IAT. Are they one in the same?

When you put the TCV in did you do the readaptation procedure?
Yes I did.
 

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Cool. I'll check that tomorrow.

Edit: Actually, where is that? Looking at a picture of it, it looks like what I thought was the IAT. Are they one in the same?



Yes I did.
I really am not quite sure whether it's the IAT or BPS, i've heard of it referred to as both...but it's the sensor that is right where the cooled air from the intercooler exits into the cold side piping, it should have just one torx screw holding it in place. I removed the airbox and used a ratchet and long torx bit to reach the screw without risking damaging the electrical connection as it kind of angles upwards. You can probably just stick a couple of fingers down there and try to wiggle the sensor around, you'll be able to tell if it's loose or not.
 
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