Asking for help...

Tanker3278 · Aug 21, 2019

Been chasing the bugs in this truck since I bought it 4 years ago.

Biggest bug right now:
Truck has no accelerating power. As long as I accelerate slowly I can get the truck up to speed (had it up to 80 on the highway). If I stick my foot in the throttle hard to try accelerating quickly, the RPMs pick up a little (not much) but there's very little noticeable power and the speed picks up very slowly. Makes passing on a 2-lane country highway nearly impossible. I drive like a granny most of the time and didn't notice it till I was in a hurry 2 weeks ago and tried passing in a straight stretch.

I've been digging through forums since then checking things, but have come to the realization I need help because I don't know what my guages are telling me.

I've attached a couple of screenshots from FORScan Lite of the things I think are relevant. One is at idle and the other is at 1500 rpm.

Any help is appreciated!
- Jimmy

http://powerstrokearmy.com/photopost/data/500/medium/Capture_2019-08-21-17-32-09.png
http://powerstrokearmy.com/photopost/data/500/medium/Capture_2019-08-21-17-31-44.png

6.0 Tech · Aug 21, 2019

What year truck? Whats done to the truck? Have you checked for boost/exhaust leaks? What is fuel pressure?

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Tanker3278 · Aug 22, 2019

2005 F350 XL / CC-LB / Auto / RWD / gooseneck
Was a landscaping company fleet truck in Austin, TX before I bought it from a lot in Waco, TX.

20K MILES AGO: (when I bought the truck)
2x new batteries
Head gaskets
Had valve job done on the heads while they were off.
ARP Studs
STC fitting
Stand pipes
HHC Diesel nipple cups
EGR ****** (left the valve connected, laying on top of the manifold)
FICM - put a new power board in it.
Blue Spring
2x new glow plug harnesses

10K MILES AGO
New alternator (stock)

2K MILES AGO
Finally found a shop up here locally that flashed my computer to turn off the EGR valve. Very unimpressed with that shop, didn't seem to know much about diagnosing a 6.0 and afterwards flatly said they didn't have IDS, just a programmer.

500 MILES AGO:
Turbo rebuilt & Balanced (Midwest Turbo Connection)

Checked the boots and pipes for leaks, didn't feel any.
Clamps are down tight.

Will get screen shots of the fuel pressure & boost this afternoon when I get off work.

03_PSD · Aug 22, 2019

you have a fuel pressure gauge installed?

03_PSD · Aug 22, 2019

Your first screen shot is approx. 1500 rpm and your IPR is only 28.9%, I'm not a mechanic but that seems odd. IPR screen could be clogged since the trucks been worked on.

Tanker3278 · Aug 23, 2019

Had a eurika moment when playing with FORScan this afternoon.

I don't have a fuel pressure guage, but I think I'll have to get one. I finally figured out where the error codes are in those menus.

http://powerstrokearmy.com/photopost/data/500/medium/Capture_2019-08-22-17-57-03.png http://powerstrokearmy.com/photopost/data/500/medium/Capture_2019-08-22-17-57-46.png
I assumed the manifold guage pressure would be my boost, so I added it.
Thought it odd it was at zero.
Up to 1500 RPM, no change - still a goose egg. Bingo! Dead sensor.

And thats when I decided to try to find the codes through FORScan. Here's what I found:
http://powerstrokearmy.com/photopost/data/500/medium/Capture_2019-08-22-18-18-23.png
And
http://powerstrokearmy.com/photopost/data/500/medium/Capture_2019-08-22-18-18-52.png

Found some of those bugs I've been searching for!

ghohouston · Aug 23, 2019

Check the map sensor hose for cracks. It needs to fit tight on the nipple on the intake manifold and on the sensor. And take a nail or piece of wire and poke through the nipple as well to make sure it is not clogged.

bismic · Aug 23, 2019

btw - you do not have a "manifold gauge" sensor.

The manifold gauge pressure (boost) is determined by subtracting the Baro from the MAP.

03_PSD · Aug 23, 2019

03_PSD said:
Your first screen shot is approx. 1500 rpm and your IPR is only 28.9%, I'm not a mechanic but that seems odd. IPR screen could be clogged since the trucks been worked on.

I did look at my IPR numbers yesterday afternoon and forget what I post. My numbers were close to yours.

:stupid:

Tanker3278 · Aug 23, 2019

Decided to replace the MAP sensor. (Per GHOHouston's advice) Pulled the hose off with the old sensor. Was split down by the clamp. Thanks GHOHouston!

http://powerstrokearmy.com/photopost/data/500/medium/0823191934.jpg

Was going to trim off the end, but the end crumbled when I started cutting. Leaving it off for the night. Going to get a replacement in the morning.

03_PSD, no worries. Thanks for the effort!
Bismic, thanks for the info on how boost is calculated, I didn't know that! Pretty cool!

Tanker3278 · Aug 28, 2019

I'm about half retarded.

Replaced the MAP & line to the manifold. Didn't fix the problem.

Looked at the baro sensor. Was working and reading 29.60. I figured if the baro sensor had failed the computer would have defaulted to 29.92 (standard sea level pressure).

Still not getting a signal. So I checked the turbo again.

Mounted solid.
Pipes on tight.
No loose or split boots.

The I looked right at it. Solenoid connector clips had broken off. Connector had slid out just enough to loose connection.

Pushed it back in all the way. Presto-wammo, turbo running normally. Plenty of power.

My shop foreman would have thrown the tank TM at me and cussed me out like a private for something that simple. Basic -10 level maintenance. I missed it when I checked before.

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