Destroyed a 7.3 - can't get to run with new motor now :( - Ford Powerstroke Diesel Forum
LinkBack Thread Tools Display Modes
post #1 of 3 Old 03-09-2009, 05:39 PM Thread Starter 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.

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.

  1. Does the low pressure oil sending unit have anything to do with it not wanting to start?
  2. If the low pressure sending unit doesn't sense low pressure, would this cause it to die after firing?

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


schoen311 is offline  
Sponsored Links
post #2 of 3 Old 03-09-2009, 05:48 PM
Doesn't Even Care

HVAC SuperTech's Avatar
Join Date: Sep 2007
Location: Fletcher, NC
Posts: 18,045
Thanks: 105
Thanked 141 Times in 134 Posts
Mentioned: 3 Post(s)
Quoted: 69 Post(s)
Feedback Score: 0 reviews
ok, the LPOP(low pressure oil pump) is attached to the crank. it should turn as the engine is spinning over. If you are not getting oil into the resivior on your HPOP, then you probably arent moving oil through the block. I would start there. Was the engine a reman? or did you put it together yourself? I would look towards the pump or the pickup in the pan first.

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

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

HVAC SuperTech is offline  
post #3 of 3 Old 03-09-2009, 05:53 PM Thread Starter 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
Engine was a new longblock, put together by us (hubby is a shop teacher and experienced mechanic). We've already replace the low pressure pump once thinking along those same lines, but didn't work. Didn't think about the pickup in the pan though - will take a look at that.

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.

Any chance it could be some sort of relay or sensor that's intermittent?

Last edited by schoen311; 03-09-2009 at 06:05 PM.
schoen311 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