7.3 with low power - Ford Powerstroke Diesel Forum
User Tag List

 
LinkBack Thread Tools Display Modes
post #1 of 7 Old 11-23-2013, 12:50 PM Thread Starter
If it aint a CAT itsa DOG

 
dieseldan2005's Avatar
 
Join Date: Apr 2007
Location: North Branch, MN
Posts: 4,553
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks: 0
Thanked 2 Times in 2 Posts
Feedback Score: 0 reviews
7.3 with low power

Ok guys I have owned a ton of different ford diesels over the years and this is my 4th 7.3. This and and my other ones are all super duties 99-01. I just bought this thing and it has 202k on it. It is way slower than any other 7.3 i have ever owned. It seems like it takes for ever to build boost. I changed my oil to Delo 5w40 synthetic, AFTER i did this i get a loud engine knock after it warms up, but only at idle. Here is a list of what is going on and what i have tried.

-no abnormal smoke
-starts good
-no missing
-has a SLIGHT exhaust leak on one up pipe, but i've had others with this before. Its not blowing soot onto the firewall.
-its only building about 16psi of manifold pressure on my AE, but takes forever to get there.
-#8 cyl fails contribution test (could be normal)(part of knocking sound?)
-all injectors pass buzz test
-haven't had time to change fuel filters, but truck was maintained well with paperwork to proove
-CAC boots seem to be ok except for oil soaked
-can barely hear the turbo spool up like i could on other ones

Anything else I might be forgetting? Also that engine knock was not present when i bought the truck, only started doing it after i changed oil to full syn. I had this happen on my 01 with the #8 cackle, but this seems a lot louder, almost like all the injectors are starving a little. Any more ideas would be great.

Diesel Dan

10,000 LAKES CHAPTER MEMBER


2003 F350 Crew cab long box, FX4, 6.0, torqshift, Lariat.
dieseldan2005 is offline  
Sponsored Links
Advertisement
 
post #2 of 7 Old 11-23-2013, 01:02 PM
Powerstroke.org Rookie
 
RexF350's Avatar
 
Join Date: Nov 2012
Location: Arkansas by Brian's Truck Shop
Posts: 20
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks: 0
Thanked 2 Times in 2 Posts
Feedback Score: 0 reviews
When you stomp down on the throttle all the way does it blow black smoke like normal? My first thought is that it's not getting fuel to the cylinders for some reason. If it does blow black smoke like normal, then my next thought would be that the turbo is not responding correctly to the exhaust you are giving it. This would indicate that your turbo might be due for a rebuild. I have heard of turbos giving out around 200,000 miles or above. Have you drained your fuel filter lately to see if you have water? Water in the fuel can cause everything you mentioned. Sorry if any of this is dumb, I'm no mechanic.
RexF350 is offline  
post #3 of 7 Old 11-23-2013, 01:12 PM
Compression Ignition Addict
 
blue99stroker's Avatar
 
Join Date: Oct 2011
Location: Chico, California
Posts: 4,578
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 69 Post(s)
Thanks: 18
Thanked 169 Times in 161 Posts
Feedback Score: 0 reviews
leaky up pipes kill boost.
and the only way to tell if the CAC boots are leaking is if you pressurize the system with the truck off.
build your own boost leak detector or buy one from dieselsite.
bad ipr on my truck caused low boost as well.

99.5 f250 7.3 4x4 255k
PHP Phoenix, S&B, 4" Diamond Eye, Hpx, Stancor, RR Billet Wheel, RR AIH Delete, Autometer Gauges, Pro Comp leveled, Transgo Tugger, Billet TQ Converter, Warn Hubs, Int'l Up-Pipes, RR IC-Boots, Non-Ebpv Pedestal, High Flow Outlet, Hucorey's HPOP Lines, RR High Flow Fuel Fittings, RR OCR, Barder 360 Thrust Kit, 08 Tow Mirrors.

Dad-2000 7.3 108k miles, Autometer Gauges, Superchips 1705, RR AIH Delete, 6637, 4" Diamond Eye, BD Billet Wheel, TruCool Max
blue99stroker is offline  
post #4 of 7 Old 11-23-2013, 05:14 PM Thread Starter
If it aint a CAT itsa DOG

 
dieseldan2005's Avatar
 
Join Date: Apr 2007
Location: North Branch, MN
Posts: 4,553
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks: 0
Thanked 2 Times in 2 Posts
Feedback Score: 0 reviews
I don't get any black smoke, but in all fairness to these trucks, when they are untuned i never got black smoke unless it was during the summer and i was running 15-40 dino oil. When i switched oils to synthetic it would always get rid of my black smoke. I haven't had a chance to check the ipr or icp yet or drain the fuel bowl. I just bought the truck and time has been short with it. It has was only 5 degrees outside today so not fun to work on the truck. You guys have a diagram of a homemade CAC leak checker? The other thing i forgot to mention was i did take off the red waste gate line and it seemed to give it more power, so maybe she is sticking?

Diesel Dan

10,000 LAKES CHAPTER MEMBER


2003 F350 Crew cab long box, FX4, 6.0, torqshift, Lariat.
dieseldan2005 is offline  
post #5 of 7 Old 11-23-2013, 05:53 PM
Powerstroke.org Rookie
 
RexF350's Avatar
 
Join Date: Nov 2012
Location: Arkansas by Brian's Truck Shop
Posts: 20
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks: 0
Thanked 2 Times in 2 Posts
Feedback Score: 0 reviews
Yeah, mine barely smokes, but if I floored it and didn't have any boost or acceleration I bet it would smoke a lot. Of course, I know my truck really well and yours is new to you. I would definitely check for water though with the lack of power and knocking. Brian from BTS told me that water can grenade your injectors. A boost leak might be it, but that doesn't explain the knocking.
RexF350 is offline  
post #6 of 7 Old 11-24-2013, 12:43 PM Thread Starter
If it aint a CAT itsa DOG

 
dieseldan2005's Avatar
 
Join Date: Apr 2007
Location: North Branch, MN
Posts: 4,553
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks: 0
Thanked 2 Times in 2 Posts
Feedback Score: 0 reviews
Ok i will check that stuff out again when i get a chance. Thanks guys

Diesel Dan

10,000 LAKES CHAPTER MEMBER


2003 F350 Crew cab long box, FX4, 6.0, torqshift, Lariat.
dieseldan2005 is offline  
post #7 of 7 Old 11-27-2013, 11:37 AM Thread Starter
If it aint a CAT itsa DOG

 
dieseldan2005's Avatar
 
Join Date: Apr 2007
Location: North Branch, MN
Posts: 4,553
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks: 0
Thanked 2 Times in 2 Posts
Feedback Score: 0 reviews
Well i checked out my ICP sensor today and it was full of oil, its was pushing oil out around the weather pak connector. So i am going to go get a new one and see if that does anything.

Diesel Dan

10,000 LAKES CHAPTER MEMBER


2003 F350 Crew cab long box, FX4, 6.0, torqshift, Lariat.
dieseldan2005 is offline  
Sponsored Links
Advertisement
 
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