Stumped...
Thread Starter
|
FTE Leadership Emeritus
Joined: Sep 2003
Posts: 12,258
Likes: 769
From: Houston, Texas
Stumped...
A buddy of mine has a 2007 F350 that I helped him check out before he purchased it. He absolutely loves the truck, but here lately it doesn't seem to have much "testicular fortitude".
Here's what was done so far:
-Changed the Air Filter to a Motorcraft filter (was a Wix packed with dirt)
-Changed both fuel filters a few months ago (doesn't drive too much, but just enough)
-Replaced both transfilters
-Cleaned the EGR valve
The truck is fine at lower RPMs (normal driving around town and cruising), but when you mash it to pass someone, the truck can't get out of it's own way.
The boost gauge on the dash is moving and the truck feels worlds better since the air filter change, but what am I missing? What could be causing this truck to lose it's cojones at the top end?
We both agreed that it needed a complete trans flush, but I don't see how that would hold the truck back when you're on it.
Here's what was done so far:
-Changed the Air Filter to a Motorcraft filter (was a Wix packed with dirt)
-Changed both fuel filters a few months ago (doesn't drive too much, but just enough)
-Replaced both transfilters
-Cleaned the EGR valve
The truck is fine at lower RPMs (normal driving around town and cruising), but when you mash it to pass someone, the truck can't get out of it's own way.
The boost gauge on the dash is moving and the truck feels worlds better since the air filter change, but what am I missing? What could be causing this truck to lose it's cojones at the top end?
We both agreed that it needed a complete trans flush, but I don't see how that would hold the truck back when you're on it.
Lead Driver
Joined: Feb 2011
Posts: 8,241
Likes: 155
From: L.A. (Lower Alabama)
Maybe a CAC or exhaust leak. Low fuel pressure. Dirty/binding turbo. Does truck have any gauges? Any hissing noises from under the hood accelerating cold start? Exhaust smell in cab? Might try the blue spring fuel pressure regulator update. Pretty quick and inexpensive and some have posted it seemed to pick up some power.
Thread Starter
|
FTE Leadership Emeritus
Joined: Sep 2003
Posts: 12,258
Likes: 769
From: Houston, Texas
Maybe a CAC or exhaust leak. Low fuel pressure. Dirty/binding turbo. Does truck have any gauges? Any hissing noises from under the hood accelerating cold start? Exhaust smell in cab? Might try the blue spring fuel pressure regulator update. Pretty quick and inexpensive and some have posted it seemed to pick up some power.
My money is on the low fuel pressure for the time being. I don't think it has the blue fuel spring, so I'll have him try that.
Under WOT it's making 20 pounds easily, the last few times there were no DTCs, but after a few tests with my AE, a few may come up.
Thread Starter
|
FTE Leadership Emeritus
Joined: Sep 2003
Posts: 12,258
Likes: 769
From: Houston, Texas
I figured, my 7.3 puts out more than that...
What's the magic number...?
What's the magic number...?
FTE Leadership Emeritus
Joined: Aug 2007
Posts: 42,085
Likes: 6
From: Lakewood, Ca.
Trending Topics
Thread Starter
|
FTE Leadership Emeritus
Joined: Sep 2003
Posts: 12,258
Likes: 769
From: Houston, Texas
148K, truck runs great otherwise
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
Top 10 Fords at 2026 Carlisle Ford Nationals
Joe Kucinski
3 Best / 3 Worst Parts of Modern Ford Ownership
Brett Foote
10 Amazing Upgrades That Solve Common Ford Truck Owner Headaches
Pouria Savadkouei
Every 2026 Ford Engine Explained
Brett Foote
10 Ugly Ford Trucks That We Still Kinda Love
Joe Kucinski
10 Things Every Truck Owner NEEDS (2026 Edition)
Michael S. Palmer
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Verdad Gallardo
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer
Joe Kucinski
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Postmaster
Joined: Jul 2011
Posts: 3,263
Likes: 0
From: Houston, TX
i second that notion on the blue spring upgrade. if checking CAC tubes, i'd feel for under the boots. if cracks do show up, most of the time, they're underneath. rarely is it visible from on top. i dunno, but my paranoid self might also test the FICM too. ficm, fuel filters, blue spring, they're kinda related. lol.
wat is the eot n ect delta? also, i'd check tat egr valve, and clean it up. if it aint been done yet, i'll bet tat it's nasty dirty. heck, only a snuggy can put "nasty" n "dirty" in the same sentence. lol. punish me. lmao.
wat is the eot n ect delta? also, i'd check tat egr valve, and clean it up. if it aint been done yet, i'll bet tat it's nasty dirty. heck, only a snuggy can put "nasty" n "dirty" in the same sentence. lol. punish me. lmao.
Thread Starter
|
FTE Leadership Emeritus
Joined: Sep 2003
Posts: 12,258
Likes: 769
From: Houston, Texas
Spent the weekend under the hood of a 2007 F-350 and needless to say she's healthy again!
-Reconditioned the turbo, found some rust right underneath the veins, and some on the unison ring. (Not very much, but enough to make it stick.) Slathered the unison ring in anti-seize, gave a light coat to the other necessary parts. Still need to perform the VGT relearn though
-Rebuilt the secondary fuel filter housing, found it clogged with gunk, changed the filter, installed the Blue fuel spring, replaced all o-rings with Ford/International's rebuild kit.
-Found that injector #1 was misfiring causing the truck to run rough and stall. After a call to Clay at Riffraff, we had it the next day. R&R'd injector #1.
-Changed the oil in the truck and added some of Chris Gabrelcik's Hot Shot Secret in case some of the other injectors had any ideas.
-Added a shot of Diesel Kleen to the tank
-Did a complete flush with Rotella ELC
After a good 30 minute drive, the truck was boosting well over 20 pounds and was like a brand new truck again.
Thanks for all y'alls help!!!!
-Reconditioned the turbo, found some rust right underneath the veins, and some on the unison ring. (Not very much, but enough to make it stick.) Slathered the unison ring in anti-seize, gave a light coat to the other necessary parts. Still need to perform the VGT relearn though
-Rebuilt the secondary fuel filter housing, found it clogged with gunk, changed the filter, installed the Blue fuel spring, replaced all o-rings with Ford/International's rebuild kit.
-Found that injector #1 was misfiring causing the truck to run rough and stall. After a call to Clay at Riffraff, we had it the next day. R&R'd injector #1.
-Changed the oil in the truck and added some of Chris Gabrelcik's Hot Shot Secret in case some of the other injectors had any ideas.
-Added a shot of Diesel Kleen to the tank
-Did a complete flush with Rotella ELC
After a good 30 minute drive, the truck was boosting well over 20 pounds and was like a brand new truck again.
Thanks for all y'alls help!!!!
Thread
Thread Starter
Forum
Replies
Last Post
grainfedprairieboy
1994.5 - 1997 7.3L Power Stroke Diesel
24
Oct 19, 2011 10:49 PM
Core250PSD
1994.5 - 1997 7.3L Power Stroke Diesel
12
Oct 27, 2010 08:53 AM
smoky_diesel
1999 - 2003 7.3L Power Stroke Diesel
13
Oct 17, 2007 06:37 AM
Todd525
1994.5 - 1997 7.3L Power Stroke Diesel
8
Nov 26, 2005 03:49 AM