Good Morning everyone, in the beginning of January I bought a 2004 F-450 6.0 with 186k miles (not sure if its been clocked back).

Since I bought the truck I have had only 2 issues that are odd. One is a hot no start that is very sporadic (its happened 5 or 6 times). I know it needs 500 psi min to crank and when that happens it gets to around 350psi. Because Im afraid of issues I did a oil change thw day after I bought it did a road trip of 2500 miles (with no issues) and did a oil change again. All with motorcraft filters, lucas oil stabilizer and I use a little of diesel kleen or lucas injector cleaner every time I fuel up. I was told never go below half a tank so I follow that rule.

The second is a small oil leak from the passenger side. BUT it only happens when the truck sits for 3 or 4 days unused. During my road trip, not one drop. I used it on the weekend not one drop, but since its my 3rd vehicle I park it Sat or Sunday and by Wednesday Ill see the size of silver dollar, I cant seem to find it.

Any advice is greatly appreciated.*

Do you think the blue spring upgrade may help with the hot start issue? Also it has a egr delete but the heads have not been done, and I want to put a tuner. Would that be ok? I dont drive hard. As a example on my road trip I NEVER went past 70mph(with my wife saying I drive slow) and I averaged around 15mpg. I would like to get more mpg.

Thanks again.

*Edit**Reply

Reply

 

I am no expert by any means but it seems a hot no start is usually a high pressure oil leak. The oil thins out when it is hot and leaks causing the loss in pressure. I would suspect the lucas oil treatment kept the oil just thick enough to allow the system to build up enough pressure to start.

If the problem is the hpo system then the blue spring update will not help the hot no start condition. The blue spring update is for fuel pressure.

 

Depends on motor build, early or late as to likely culprits. But this is a HPO leak problem. Do you have a sensor plugged in at the top front of the passenger side valve cover?

 

Yes I do. It looks clean. But I'm a novice.

 

An air test of the hpo system is in order.

2006 F350 4X4

 

That's the high pressure oil pump correct?

 

High pressure oil system.

You likely need dummy plugs, stand pipes, or an STC fitting. Also possible are oil rail o-rings, or injector top rings

 

Thank you!!!

 

Once i get this fixed. Would a tuner with arp heads be ok?

 

No STC fitting on an 04 engine.

Standpipes nor dummy plugs are likely.

After extended run time try to park nose down and see if it starts better.

Josh

 

If it is an 05 dated motor, it would have an STC.

Depends on the motor. I have done '04 trucks with '05 motors...

 

Sure, no reason not to.

SCT is the tuner most choose...

 

My apologies I meant without head studs.

 

You can still do it without studs. But educate yourself about tuners, custom tunes, and being safe.

 

Thanks. Im mostly looking to increase my mpg. On my road trip i averaged 15mpg. I would like to see if I can get to 20mpg.