Overboost? - Ford Powerstroke Diesel Forum
User Tag List

 
LinkBack Thread Tools Display Modes
post #1 of 3 Old 11-10-2010, 04:47 PM Thread Starter
Compression Ignition Addict
 
AlwaysStrokin''s Avatar
 
Join Date: Oct 2010
Location: Billings, MT
Posts: 597
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks: 0
Thanked 2 Times in 2 Posts
Feedback Score: 0 reviews
Overboost?

Sometimes my truck will run differently at times and then after a few key turns it seems to go away. It seems like it's defueling or something and runs with less fuel. The check engine light has never come on. But I'm wondering if my truck is reading an overboost and not letting me get all the fuel I need. I'm thinking this because some days it will smoke a lot more than others under similar conditions. It also seems like I never get over 20-25 pounds, it kind makes a noise not like surge but more like the wastegate is actuating when I get up into the higher boost ranges and when my truck shifts under hard acceleration. I just put a hole new waste gate assembly on a while ago, just stock again. So maybe I just need to adjust the wastegate to hold the boost? Let me know what you guys think.

2002 F-350 Crewcab LB XLT
Quad-Pillar Isspro II Gauges, Dp-Tuner: Stock, Hi-Idle, 40Hp Tow, Decel, 80E, 100Hp
4" MBRP Exhaust, T-500 HPOP, AFE II Intake, HID's, Recon Light Bar, Custom Running Boards, Custom Bumper, HPx, FRx
AlwaysStrokin' is offline  
post #2 of 3 Old 11-11-2010, 08:57 AM
Compression Ignition Addict
 
Join Date: Apr 2008
Location: Wellington Nevada
Posts: 8,703
Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Thanks: 1
Thanked 42 Times in 41 Posts
Feedback Score: 5 reviews
You may need a boost fooler..

There is no defuel on the Super Duty trucks regardless of boost amount. There is an overboost code that reduces the cycle time of the IPR. The result is a slower gain in acceleration, not a reduction of fuel. The way to see if you are setting this would be to scan for the code. This is off the top of my head and it may be wrong, but I think it is a P0236 that is the code. You can set them on 94-97's, but it is a higher differential than the 99-03's. I run a MAP Pressure Relief Valve on my 95.

However, I've seen various configurations of MAP sensor alterations and I would warn that most are ill conceived. The majority of the pressure relief set ups I've seen blow off actual boost and do not isolate excess boost to the MAP side only, leaving the manifold pressure able to rise. The electric modifications don't allow MDFR (Mass Desired Fuel Rate) on the low end early enough since they mitigate the overall boost by a percentage.
CT Performance, Inc. is offline  
post #3 of 3 Old 11-11-2010, 02:40 PM Thread Starter
Compression Ignition Addict
 
AlwaysStrokin''s Avatar
 
Join Date: Oct 2010
Location: Billings, MT
Posts: 597
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks: 0
Thanked 2 Times in 2 Posts
Feedback Score: 0 reviews
Wow that's a mouthful...

Um...so is there anywhere that will scan codes for free. Like NAPA or O'Reilly. Do they do that type of stuff? I know the dealerships charge for stupid stuff like that.. Maybe I'll start with scanning some codes. Then decode the last part that you said haha. I'm doing my best to learn everything, all in good time I suppose

2002 F-350 Crewcab LB XLT
Quad-Pillar Isspro II Gauges, Dp-Tuner: Stock, Hi-Idle, 40Hp Tow, Decel, 80E, 100Hp
4" MBRP Exhaust, T-500 HPOP, AFE II Intake, HID's, Recon Light Bar, Custom Running Boards, Custom Bumper, HPx, FRx
AlwaysStrokin' 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