Boost leak driving me nuts - Miata Turbo Forum -Boost cars, acquire cats.

Welcome to   Members

DIY Turbo Discussion greddy on a 1.8? homebrew kit?

LinkBack Thread Tools
Old 06-13-2011, 06:54 PM   #1
Junior Member
Thread Starter
iTrader: (1)
Join Date: Jan 2010
Location: Palmdale, CA
Posts: 57
Total Cats: 4
Default Boost leak driving me nuts

Yeah I know cross post from Mnet, but I figured there would be more knowlede over here. I also wasn't sure which section to post in. I've suspected for a while that I have a boost/vaccum leak. I'm not seeing the boost that I should and my map at idle floats between 23 and 26. I have narrowed it down to 1 cubic foot area behind/under the intake manifold. When I pressurize the intake to 12psi it takes only a few seconds to leak out. I've tried carb cleaner with no luck, and I can't feel where it's coming from nor see it using soapy water. It is fairly loud but I can't pinpoint it. I cleaned the crap out of the egr valve thinking it may be the culprit. How well should the egr valve seal? With the valve closed and the upper hole plugged I can still blow through the nipple and hear it escape through the lower hole. Are there any other possible leak points in this area that I'm missing?

Brain fart, this probably should be in the SC section. Feel free to move it Mods

Last edited by Scooter25; 06-13-2011 at 07:12 PM.
Scooter25 is offline   Reply With Quote
Old 06-13-2011, 08:46 PM   #2
Supporting Vendor
iTrader: (31)
Savington's Avatar
Join Date: Nov 2006
Location: Sunnyvale, CA
Posts: 13,223
Total Cats: 784

13-104J in that picture - do you have it? It's like a 3/8" plug, impossible to miss if you're actually looking for it.
Savington is offline   Reply With Quote
Old 06-13-2011, 10:30 PM   #3
Senior Member
Join Date: Dec 2004
Location: Brisbane, Australia
Posts: 1,268
Total Cats: 32

Also check for a crack in the vac line or that cap, that's what mine was...
timk is offline   Reply With Quote
Old 06-14-2011, 04:07 AM   #4
Junior Member
Join Date: Jan 2011
Location: sacramento ,ca
Posts: 383
Total Cats: 21

i use an automotive stethoscope with the pick up end taken off(so its just a tube hooked to your ears) to pin point pin holes in my exhaust manifolds i make... maybe you can do the same for your intake leak
fastivab6tg25mr is offline   Reply With Quote
Old 06-16-2011, 12:06 AM   #5
Junior Member
Thread Starter
iTrader: (1)
Join Date: Jan 2010
Location: Palmdale, CA
Posts: 57
Total Cats: 4

The hoses and that cap are good. I ended up making an aluminum block off gasket for the egr valve from a PBR can and voila, no more leak. Would there be any issue driving with my ghetto fab block off? I'm running MSPNP so I think I may be ok.

:edit: Alright, so rather than wonder if a thin piece of aluminum would hold up, I just made a block off plate out of some 1/16" scrap steel I had laying around. That ought to be durable enough.

Last edited by Scooter25; 06-16-2011 at 01:39 AM.
Scooter25 is offline   Reply With Quote

Related Topics
Thread Thread Starter Forum Replies Last Post
Project Gemini - Turbo Civic on the Cheap Full_Tilt_Boogie Build Threads 52 08-28-2016 04:18 AM
Going back to stock. Need some 1.6 parts. Trent WTB 2 10-01-2015 12:15 PM
Leaky Wilwoods mx592 Suspension, Brakes, Drivetrain 1 10-01-2015 12:45 AM
Bad head gasket or ? shooterschmidty Engine Performance 8 09-30-2015 10:28 PM
3rd Time's a Charm...hopefully. zephyrusaurai Meet and Greet 2 09-28-2015 10:59 PM

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

All times are GMT -4. The time now is 07:33 PM.