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Help with a boost issue

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98srt

10+ Year Contributor
141
0
May 8, 2009
Wilmington, North Carolina
Car runs good, drives good. Now to my problem, the car will not make boost. I have leak tested it to no end, had the turbo professionally check and ok'd, redone vaccum lines every way you can think, cranked the controller all the way up, check the bov, taken apart the wastegate and checked it, unhooked the wastegate to try and make it make power and it just wont do anything, I even compression checked the motor. Im fresh out of ideas. The car has a 62-1 with a tubular manifold, manual boost controller, 44mm tial gate and a crushed stock bov. Does anyone have any ideas? Also can someone point me to a vaccum diagram please.

Also the car was making 25psi and blew a intercooler pipe off and I put it back on and thats when the problem started, I hadn't changed anything and it just quit after that.

Thanks,

Daniel
 
have you checked your timing? i had my tsi blow off its piping and then it would start for about 10 seconds and then shut off on me. turned out timing was way off but didnt tear the belt. hope this helps.
 
I havent counted, but it would take one hell of a leak for the car to make no boost with the wastegate line unhooked. I mean the turbo would just keep spooling. The car runs exactly the same with and without one of the intercooler pipes hooked up. Its the strangest thing.
 
Well man there's not many things it could be, and they're all mechanical so it shouldn't be that hard to fix it. It's either:

1. A massive boost leak.

2. A massively cracked turbine housing.

3. Something wrong with the wastegate (not staying closed)

4. Bad turbo.


I'm guessing that it's a problem with the wastegate since you said it makes absolutely zero boost. Whatever it is it's not a huge problem, worst case scenario you need a new turbo.
 
ok do the fins spin freely? and when you turn the car on will it spin and spool when you give it gas? if so then id say im out of ideas...!
 
The turbo has been professionally taken apart and checked so that can't be the issue.

And I took the wastegate apart and checked it out even though its a brand new tial 44 and it seemed fine, looks like its never opened since the dump tube isn't showing any exhaust soot in it.
 
98srt said:
The turbo has been professionally taken apart and checked so that can't be the issue.

And I took the wastegate apart and checked it out even though its a brand new tial 44 and it seemed fine, looks like its never opened since the dump tube isn't showing any exhaust soot in it.
Click to expand...



I'm having what appears to be a very similar problem. Just put in a brand new long block 6-bolt, and ever since, it just won't make any boost. I have the FP18G6SL-2 turbo, internally gated with a mbc. Engine runs fine, compression test good, turbo has been profesionally checked, wastegate professionally checked. The car just will not make any boost. No idea what is going on. Car has been at RRE for a few weeks, and they haven't found the issue yet. I'm going to pick it up in the next few days and see if I can figure anything out.

Let me know what you find, because I'm clueless too...we may possibly have the same issue.
 
I'm just so at a loss with it. It goes from 25psi, to popping a pipe off, to no boost at all. It blows my mind, and this isnt my first turbo car so I do know a good bit but still cant get it.
 
How long had the car been boosting fine to 25 psi before the pipe blew off?
 
bout a week, hadn't really finished it enough to drive it all the time due to starter and alt problems
 
Your manifold isn't cracked somewhere, maybe underneath where you aren't seeing it? To me this almost sounds like the timing jumped and bent valves, but you are saying you did a compression test so that should eliminate that. Have your checked the timing marks to make sure they line up properly. That would atleast eliminate that idea.
 
Does the car drive fine other than it just won't make any boost? Will it still rev to 5k with all of the piping hooked up?

Reason I ask is because I while back someone had a no boost problem after turbo install. Come to find out a forgotten rag was stuck in the IC, but he had revving problems to go along with the no boost.
 
Drives like a charm, just pulls like a n/a 2.0.

I did a comp test and it was all 170-175 but I havent checked the timing yet, the intake mani had a crack on the top but thats been fixed from way before this issue and I have checked the bottom too to no avail, wouldnt a cracked mani cause the idle to skyrocket?
 
I know you had a shop check out the turbo but I would still pull the intake pipe and spin it by hand to make sure it's not seized up.
 
Whats the chance you had the bolt holding the housings on the CHRA loose to clock the turbo and left one or a couple loose? Or depending on the turbo some have a big o-ring on the compressor side, that could be missing, partially ripped, etc...
You should do another boost leak test and see how long it holds 15-20psi. Also explain exactly where you are attaching your boost leak tester and how you are doing the test? This could help figuring things out knowing how things are being done as there are many different methods some of which aren't the best.
 
put the leak tester on the inlet of the turbo, hit it with the air compressor to about 15psi

romeen said:
I know you had a shop check out the turbo but I would still pull the intake pipe and spin it by hand to make sure it's not seized up.
Click to expand...

I did, spins free and the fins arent bent or hitting anything. Its been rainy here lately so I havent messed with it since saturday.
 
Do what BLINKY619 suggested. Check to see what the turbo is doing when the motor is idling and does it spin faster if you rev it up?
 
I leak tested it after the turbo and everything seemed fine, I did notice while testing it that where the compressor housing meets the center section it is leaking. Leaking bad, so I blue rtv'd all the way around it. I checked all the bolts and they were all tight so IDK why it would be leaking but Im hoping the sealant fixes it, that might be my issue. Ideas?
 
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