Engine surging under low boost - Ford Powerstroke Diesel Forum
LinkBack Thread Tools Display Modes
post #1 of 3 Old 02-03-2007, 01:13 PM Thread Starter
Join Date: Sep 2006
Location: Jarrettsville, MD
Posts: 0
Thanks: 0
Thanked 1 Time in 1 Post
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
Engine surging under low boost

I guess I jinxed myself 2 weeks ago by install a straight 4" MBRP exhaust. The truck has 10,460 miles and has performed flawlessly until a few days ago. It started to gently surge at highway speeds of 55 - 65 mph and boost levels of less than 10 psi. I checked the oil level and it was 1/2 quart low. I topped it off and ran it another week with the same problem. Today I did a complete service including oil, filter & fuel filters. I also figured it was time to clean the EGR valve. I have seen pictures of worse but it was crudded up pretty bad.

I have since driven about 20 miles and it feels as if the surging isn't as noticeable but it is still there. Could this be related to the lower backpressure of the open exhaust? I don't have any means to pull codes at this point, but the light hasn't come on either. Maybe I can get Autozone or some other parts store to scan it for me.

I like the sound of the exhaust minus the cat and the muffler and would hate to be forced to go back in order for the truck to run properly. I should have known better than to monkey with something that was working so good!
720Deere is offline  
Sponsored Links
post #2 of 3 Old 02-17-2007, 03:22 PM
Compression Ignition Addict
tractor nut's Avatar
Join Date: Dec 2006
Location: louisville KY
Posts: 152
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
hate to tell you but probably needs the turbo replaced. our work truck did the same thing the dealer sais oh its an egr valve they replaced it and still did it took it to another dealer they replaced the turbo. dont know what was wrong with it but they replaced it

2002 ford f 350 with banks 4 inch exhaust, afe stage 2 air intake and a edge evolution set on the tow setting.ats ported housing and a wicked wheel with a turbo master adjustable wastegate and a south bend dual friction kevlar and ceramic heay duty towing clutch.
tractor nut is offline  
post #3 of 3 Old 02-18-2007, 05:04 AM
Compression Ignition Addict
npccpartsman's Avatar
Join Date: Oct 2006
Location: Gods Country/Home
Posts: 1,713
Thanks: 22
Thanked 13 Times in 13 Posts
Mentioned: 0 Post(s)
Quoted: 5 Post(s)
Feedback Score: 1 reviews
It's not your exhaust. The EBP valve is in the left front of the drivers side manifold and isn't affected by exhaust size despite what many say or believe. Your surging may be from coking of the turbo if your EGR was really gunked up. Do you use Diesel Kleen or Stanadyne fuel additive? They typically help prevent this. Also, drive it like you stole it occasionally and it helps prevent turbo coking.

I Bleed Razorback Red

Ford Makes It, International Shakes It, Casserly Fuels It, KC Turbo Spools It, SCT Tunes It, and Trucks Unlimited keeps her Rockin the Road
npccpartsman is offline  
Sponsored Links

Quick Reply

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


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

Email Address:


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