Notices
1994.5 - 1997 7.3L Power Stroke Diesel  

Boost leak problems

Old Dec 22, 2023 | 08:53 AM
  #1  
Ashton_1012's Avatar
Ashton_1012
Thread Starter
|
Mountain Pass
10 Year Member
Joined: Dec 2011
Posts: 143
Likes: 8
Boost leak problems

Hey everyone

I’ve spent the last few weeks diagnosing boost leaks, and installing a new KC Stage 1 turbo on my 7.3….

got everything back together and did another boost leak test to ensure I got everything together ok.

problem I’m having is now when I pressurize the boost system, I get massive air coming out the CCV vent and oil dipstick. Everything I’m reading says bad rings. My truck fires up on cold starts just fine. It runs great. I can’t imagine I have bad rings but I’m stressing about it. Anything else that can cause air to pressurize the crank case? Maybe valves weren’t seated? I didn’t try turning the engine and pressurizing again to see if it changes. When I did this prior to replacing the turbo I didn’t have this problem.

any advice ?
 
Reply
Old Dec 22, 2023 | 09:36 AM
  #2  
knottyrope's Avatar
knottyrope
Lead Driver
10 Year Member
Photogenic
Shutterbug
Loved
Joined: Apr 2016
Posts: 7,203
Likes: 1,340
From: Bahstun
I would do a compression test
turn crank 90 and see if it still blows out fast
 
Reply
Old Dec 22, 2023 | 11:37 AM
  #3  
Ashton_1012's Avatar
Ashton_1012
Thread Starter
|
Mountain Pass
10 Year Member
Joined: Dec 2011
Posts: 143
Likes: 8
Project for another day, unfortunately I don’t have the time right now!
I have absolutely zero blow by, both on cold starts and when it’s warm… I guess I’ll just have to run it and when I have time I’ll hook it up for a compression test
 
Reply
Old Dec 22, 2023 | 11:44 AM
  #4  
tjc transport's Avatar
tjc transport
i ain't rite
Joined: Mar 2005
Posts: 65,511
Likes: 5,565
From: Marlboro Mental Hospital.
Club FTE Gold Member
when you do the boost leak test you eliminate the CCV from the system, correct?
 
Reply
Old Dec 22, 2023 | 12:05 PM
  #5  
Ashton_1012's Avatar
Ashton_1012
Thread Starter
|
Mountain Pass
10 Year Member
Joined: Dec 2011
Posts: 143
Likes: 8
Correct, I had the CCV disconnected
 
Reply
Old Dec 22, 2023 | 07:40 PM
  #6  
z31freakify's Avatar
z31freakify
Hotshot
10 Year Member
Liked
Loved
Community Favorite
Joined: Dec 2012
Posts: 11,271
Likes: 1,654
From: Las Cruces New Mexico
Originally Posted by Ashton_1012
When I did this prior to replacing the turbo I didn’t have this problem.

any advice ?

Maybe the air pressure is going thru the turbo oil seals?
 
Reply
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
DanielT28
1994.5 - 1997 7.3L Power Stroke Diesel
9
May 29, 2019 12:17 PM
helloimjason
1999 - 2003 7.3L Power Stroke Diesel
13
Apr 26, 2017 10:42 PM
Highridge
1999 - 2003 7.3L Power Stroke Diesel
6
Aug 18, 2010 08:58 PM
WideOpenFord
1999 - 2003 7.3L Power Stroke Diesel
14
Nov 22, 2009 01:12 PM
mndiesel
1999 - 2003 7.3L Power Stroke Diesel
17
Nov 5, 2007 06:04 PM


Thread Tools
Search this Thread

All times are GMT -5. The time now is 12:37 PM.

story-0
10 Ugly Ford Trucks That We Still Kinda Love

Slideshow: 10 ugly Ford trucks that we still kinda love.

By Joe Kucinski | 2026-06-03 09:51:16


VIEW MORE
story-1
10 Things Every Truck Owner NEEDS (2026 Edition)

Slideshow: the best gifts for dads & grads

By Michael S. Palmer | 2026-06-03 09:39:23


VIEW MORE
story-2
Rezvani's Latest Post-Apocalytic Monster Is a Ford F-150 Raptor Underneath

Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.

By Verdad Gallardo | 2026-05-30 18:33:59


VIEW MORE
story-3
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer

Slideshow: 10 most expensive Ford trucks ever sold on Bring a Trailer.

By Joe Kucinski | 2026-05-27 16:24:34


VIEW MORE
story-4
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)

Here's everything that has changed for the latest model year.

By Brett Foote | 2026-05-27 16:17:28


VIEW MORE
story-5
Top 10 Ford Truck Tragedies

Slideshow: Top 10 Ford truck tragedies.

By Joe Kucinski | 2026-05-18 19:34:33


VIEW MORE
story-6
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make

And it might be even better than that.

By Brett Foote | 2026-05-18 19:26:42


VIEW MORE
story-7
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!

Slideshow: Does lowering an F-150 Lobo RUIN the ride quality?

By Michael S. Palmer | 2026-05-18 19:20:37


VIEW MORE
story-8
Ford's 2001 Explorer Sportsman Concept Looks For a New Home

Slideshow: Ford's bizarre fishing-themed Explorer concept has resurfaced after spending decades largely forgotten.

By Verdad Gallardo | 2026-05-12 18:07:46


VIEW MORE
story-9
10 Best Ford Truck Engines We Miss the Most!

Slideshow: The 10 best Ford truck engines we miss the most.

By Joe Kucinski | 2026-05-12 13:09:47


VIEW MORE