Destroyed a 7.3 - can't get to run with new motor now :( - Ford Powerstroke Diesel Forum

Reply
 
LinkBack Thread Tools Display Modes
post #1 of 24 Old 03-09-2009, 06:11 PM Thread Starter
Powerstroke.org Rookie
 
Join Date: Jan 2007
Posts: 17
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
Destroyed a 7.3 - can't get to run with new motor now :(

Blew out both sides of the block when a powder metal rod came apart in the bottom end.

Bought new long block and put the motor together. New innercooler, new 38R Garrett, high pressure oil pump & IPR both changed twice, cam position sensor changed out 3 times, low pressure pump changed once.

Engine was a new longblock, put together by us (hubby is a shop teacher and experienced mechanic).

The weird thing is, we'll do something like change out the HPOP, and it'll seem to work for 3-4 days - runs fine. THen will begin this starting and dying thing again - inconsistent.


PROBLEM: When starting, will crank over and over, won't start. Crank over again, will fire then die. 3rd time's the charm, will start and run. Sometimes it'l fire and die the first time, then run fine. Sometimes, it won't start at all and when you look in the hpop reservoir, it's EMPTY! If you manually fill it, it will start right back up.

When cranking and it won't fire, the gauge on the dash doesn't move at all. Once it starts, the needle will move. My other 7.3l - the needle starts to move as it's cranking over.

QUESTIONS: [*]Does the low pressure oil sending unit have anything to do with it not wanting to start? [*]If the low pressure sending unit doesn't sense low pressure, would this cause it to die after firing? [*]Any chance it could be some sort of relay or sensor that's intermittent?

Stumped and frustrated!!! Love the truck, but ready to light a match and buy a Chevy!

HELLPPP!!!

Tammy

Yes - I've posted this in a couple of different places hoping to find my saving grace!!!
schoen311 is offline  
post #2 of 24 Old 03-09-2009, 06:14 PM
Emergency Services
 
cchase's Avatar
 
Join Date: May 2007
Location: Columbus, OH
Posts: 5,534
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
Send a message via AIM to cchase
I believe if you dont have LPO the computer wont let it start. You need to have it hooked up to a computer while cranking to see what its not getting...



On vacation from a truck for a year or...
Looking at 6.4s Moving in a few months then hopefully buying my dream truck!!!

Driving an Audi till then...
but at work I drive
16 E-450s 7.3 powerstroke Ambulances
7 Duramaxes
1 GMC Kodiak Ambulance

NO CUMMINS.....
cchase is offline  
post #3 of 24 Old 03-09-2009, 06:19 PM Thread Starter
Powerstroke.org Rookie
 
Join Date: Jan 2007
Posts: 17
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
We've hooked up a scan tool to it while cranking, just haven't paid attention as to whether the low pressure shows or not - will do that tomorrow.

We realize we aren't getting oil back into the hpop, just not sure why. And we are frustrated beyond belief, so any little idea is most helpful.

Thanks!

schoen311 is offline  
post #4 of 24 Old 03-09-2009, 06:21 PM
Doesn't Even Care


 
HVAC SuperTech's Avatar
 
Join Date: Sep 2007
Location: Fletcher, NC
Posts: 18,045
Thanks: 105
Thanked 139 Times in 134 Posts
Mentioned: 1 Post(s)
Quoted: 69 Post(s)
Feedback Score: 0 reviews
either your LPOP is not functioning correctly, or your pickup is clogged or loose or something.

Is it a reman? I would def start with the Lpop. its mounted on the end of the crank.

Nick
E99/CC/Lariat/Factory Wide Body Kit
"The Mistress"
Power Hungry Performance HYDRA Chip
Custom Tuned by Bill@PHP, Tony Wildman@Total Diesel Performance and Lars@Gearhead



D66 w/Dieselsite WW2, Full Force 250/100s, Adrenalin HPOP, Built Trans, Walbro Fuel Pump, S&B Intake, 6" Stacks, Leveling Kit, Eagle Alloy Wheels, 315/75/16 Grabber AT2s & Much More




HVAC SuperTech is offline  
post #5 of 24 Old 03-09-2009, 06:38 PM
PMR = JUNK

 
Jake's Avatar
 
Join Date: Nov 2007
Location: NW, Ohio
Posts: 11,199
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 2 reviews
Send a message via AIM to Jake Send a message via Yahoo to Jake
Aren't there check valves in the HPOP? Maybe they are bad and thats why the res. is empty.

BPS President

2000 F-250, forged rods, 38r turbo, BTS trans, TW tuning and Bad Night Special 50 horse Caterpillar injectors

2002 F-350, remote engine mod



Quote:
Originally Posted by alberta 7.3 View Post
Yeah, I'd probably feel a bit drained after firing twice in rapid succession.
Facebook: Jake Phillips. If you add me tell me who you are.

Jake is offline  
post #6 of 24 Old 03-09-2009, 06:39 PM
Doesn't Even Care


 
HVAC SuperTech's Avatar
 
Join Date: Sep 2007
Location: Fletcher, NC
Posts: 18,045
Thanks: 105
Thanked 139 Times in 134 Posts
Mentioned: 1 Post(s)
Quoted: 69 Post(s)
Feedback Score: 0 reviews
i think the only check valves are in the early model IPRs. like 95-96 models.

Nick
E99/CC/Lariat/Factory Wide Body Kit
"The Mistress"
Power Hungry Performance HYDRA Chip
Custom Tuned by Bill@PHP, Tony Wildman@Total Diesel Performance and Lars@Gearhead



D66 w/Dieselsite WW2, Full Force 250/100s, Adrenalin HPOP, Built Trans, Walbro Fuel Pump, S&B Intake, 6" Stacks, Leveling Kit, Eagle Alloy Wheels, 315/75/16 Grabber AT2s & Much More




HVAC SuperTech is offline  
post #7 of 24 Old 03-09-2009, 06:39 PM
JJR
Compression Ignition Addict
 
Join Date: Nov 2006
Location: Omaha
Posts: 304
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
Friends excursion does the same thing when it sits for an extended time (like overnight). Once it gets running it runs perfect. I suspect something with the hpop and it bleeding off. Anyone know if there is a check valve or something that would leak off and cause this? If so where is it located.
JJR is offline  
post #8 of 24 Old 03-09-2009, 06:42 PM
Viking Heavy Diesel

 
Ryan Rønning's Avatar
 
Join Date: Nov 2007
Location: Wasilla, AK
Posts: 20,729
Thanks: 8
Thanked 10 Times in 10 Posts
Mentioned: 0 Post(s)
Quoted: 6 Post(s)
Feedback Score: 1 reviews
Quote:
Originally Posted by Jake View Post
Aren't there check valves in the HPOP? Maybe they are bad and thats why the res. is empty.
Thats what I was wondering. Glad you said it first so I dont look bad if its wrong.

Project Frankenstein


1997 Ford F-350, Dually conversion, Cobra 29 LX CB, 12000 watt converter, All LED lights, TW tunes, 4" DP, Napa Intake and lots of running lights.

Quote:
Originally Posted by XPLOSIV View Post
Thanks. I'll give er a good wackin in the morning.
Ryan Rønning is offline  
post #9 of 24 Old 03-09-2009, 07:07 PM Thread Starter
Powerstroke.org Rookie
 
Join Date: Jan 2007
Posts: 17
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
One thing we HAVE done is - before trying to start, we've looked in the hpop reservoir, FULL. Crank it over and over, fires, starts and dies. look in the hpop reservoir, EMPTY.

????? Like there's no return happening back to the hpop reservoir - which, by my understanding is the low pressure pump sending it back. ??

check valves - good question.

Thanks for all the thoughts - we are willing at trying just about anything at this point!

Tammy
schoen311 is offline  
post #10 of 24 Old 03-10-2009, 09:34 AM
Member
 
billman's Avatar
 
Join Date: Jul 2008
Location: Central NY
Posts: 74
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
If it was lack of oil in the hpop then why does it turn over again after the initial stall? I have the same problem but mine will turn over after the stall and run fine after start up. ALSO.... If I anticipate the stall and feather the throttle at startup, I can help it past the stall phase (about 2-3 seconds). can anyone else concur with this that has the same problem??? This only happens to me in colder temps when the truck sits over night.

My guesses:

1. Cold oil (thick)
2. Idle adjustment (can you adjust idle at startup settings?)
3. Glow plugs heat initial fuel but the stuff comming in is cold and has a lower flash point.
4. I don't have a clue and sound like an idiot grasping for straws

Most likley #4 so help me out if someone figures this out.
Thanks for having a laugh at my expense.
billman 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