Turbo not building boost in high gear - Ford Powerstroke Diesel Forum

 
LinkBack Thread Tools Display Modes
post #1 of 9 Old 06-03-2007, 12:43 PM Thread Starter
Bai
Powerstroke.org Rookie
 
Join Date: Nov 2005
Posts: 11
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
Turbo not building boost in high gear

For the past few weeks when the truck shifts into overdrive I
loose boost. When it drops back into 3rd it makes good boost. I
cleaned the airfilter and changed oil and it didn't help. There are no
error codes in the computer and no check engine light. Someone
suggested maybe it is the map sensor. Any suggestions.
Bai is offline  
post #2 of 9 Old 06-03-2007, 12:50 PM
Banned
 
Join Date: Jan 2006
Location: central coast, california
Posts: 0
Thanks: 0
Thanked 5 Times in 3 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
When was the last time u replaced ur fuel filter?
mschn99 is offline  
post #3 of 9 Old 06-03-2007, 12:58 PM Thread Starter
Bai
Powerstroke.org Rookie
 
Join Date: Nov 2005
Posts: 11
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
6000 miles ago. The truck has 102,450 miles on it.
Bai is offline  
post #4 of 9 Old 06-03-2007, 01:06 PM
Serving Our Country!
 
strokermann's Avatar
 
Join Date: Nov 2006
Location: GREAT LAKES,IL
Posts: 636
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
well inn overdrive at 75 i am only making about 4 psi. and when it drops down to 3rd it builds right back up. when your in overdrive and you push in teh pedal does it build boost. sounds pretty normal to me. slowly push teh pedal in when you in overdrive so you don't make it kick down a gear and watch your gauge see if it builds boost. and let us know what it does. i do that to mine and i can build some pretty good numbers on teh gauge. just don't mash teh pedal or it will kick into teh 3rd.just my 2 cents

CB Radio- General Lee
7.3l 99 f-250 SD
4 INCH TURBO BACK TO 6 INCH MITER CUT STACKS CURIOSTY OF GRAND ROCK AND COWBOY DIESEL PERFORMANCE.
TS 6 POSTION CHIP. stock,high idle,50,75,100,140hp.
strokermann is offline  
post #5 of 9 Old 06-03-2007, 01:11 PM Thread Starter
Bai
Powerstroke.org Rookie
 
Join Date: Nov 2005
Posts: 11
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
when its in high gear and I slowly give it fuel it starts falling on its face when i'm pulling a load. When I'm empty I don't notice it quite so much. I've had the truck for a few years and know it well. Something is definitely not right.
Bai is offline  
post #6 of 9 Old 06-04-2007, 09:35 AM
Serving Our Country!
 
strokermann's Avatar
 
Join Date: Nov 2006
Location: GREAT LAKES,IL
Posts: 636
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
well when your in overdrive you engine is at less rpm and not needing the boost. when it shifts to 3rd teh engine works harder so your boost goes up. thats normal for it to fall on its face when it overdrive whoile pulling a load. trying starting off in 4th gear with a manual tranny and see how far you get.

CB Radio- General Lee
7.3l 99 f-250 SD
4 INCH TURBO BACK TO 6 INCH MITER CUT STACKS CURIOSTY OF GRAND ROCK AND COWBOY DIESEL PERFORMANCE.
TS 6 POSTION CHIP. stock,high idle,50,75,100,140hp.
strokermann is offline  
post #7 of 9 Old 06-04-2007, 05:29 PM Thread Starter
Bai
Powerstroke.org Rookie
 
Join Date: Nov 2005
Posts: 11
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
I found part or maybe all of the problem today. The Y pipe that the exhaust manifolds attach to is leaking on one side. So i'm losing some of the power
there..
Bai is offline  
post #8 of 9 Old 06-04-2007, 09:43 PM
Compression Ignition Addict
 
lilredpowerstroke's Avatar
 
Join Date: Nov 2005
Location: Big Cypress Indian Reservation
Posts: 2,756
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
I'll betcha its leakin on the other side too!!!!!!!!

T.J.
2003 F-350 dually 6.0
Centennial Edition
Straight exhaust 34x10.50 Swampers on Black Rock Stars



Been a member longer than most of the moderators
Thats why I said most Tiff


Think you can trust the government? Ask an American Indian!

My old truck in action
lilredpowerstroke is offline  
post #9 of 9 Old 06-10-2007, 02:00 PM
Premium Member
 
straycat's Avatar
 
Join Date: Nov 2006
Location: Surrey B.C. Canada
Posts: 4,507
Thanks: 0
Thanked 1 Time in 1 Post
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
Yup,I agree with lilred, you might be running into surge as well.

Gord.

SKILLFULLY DISGISED AS A RESPONSABLE ADULT.




99.5 F350, CC, LB, DRW.
7.3 AUTO 4.10s
AUTOMETER C2s EGT, TRANS, BOOST, OIL, FUEL PRES
ATS, WW, SSHPX, B ANNIH.
DP 6P 140EX.
AFE MAG F STG 2.
MAGNAFLOW 4'' TURBO BACK DUALS.
US GEAR SUPER D-CELERATOR
500LTR FUEL TANK
BILLET GRILL
ALARM & REM START/ ELC BAT DISC.
CB, SAT, GPS, PANASONIC CD, 5th WHL
35' GOLDEN FALCON

Been a mod longer than TJ hahaha
straycat is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Ford Powerstroke Diesel Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may 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

 
For the best viewing experience please update your browser to Google Chrome