Had my 06 6.0 250 at dealer ship. They replaced fuel injector mod and egr valve, told me I needed egr cooler and oil cooler replaced, also #8 fuel injector. after $1500 was told the 2 coolers and injector would be another 3500. I Just replaced egr , oil cooler and injector. Started the truck and it ran great the first couple of times. After that it started getting harder and harder to start, ran rough till it warmed up. now wont start at all. Anybody have any idea. Im lost! thank you

 

So the FICM/Half shell was replaced?

Putting the work you preformed on the back burner, do the injectors cycle/buzz when the key is cycled On?

 

Thanks for your response! I turn key and hear a buzz, but its is , i believe the fuel pump , now that you thought of it NO. What does it mean, and how can I fix this. Again thank you!

 

There's 3 noises you'll hear under the 6.0 hood..

To be certain on which you hear,, cycle the On, you'll certainly hear the vacuum pump on the right inner fender running if the reservoir is depleted . Cycle the key a few times until the vacuum pump switches/limits Off. Now when you cycle the key On, you'll only hear 2 noises, 1 being the FICM cycling the injectors for a few seconds, and the fuel pump will run for 20 seconds (sounds like a slot car motor humming)

Injectors sound like a rattle/buzz and only for a few seconds...

 

I tried your suggestion and vacuum pump went off after 20 seconds, had a real quick buzz for maybe a second. tried again same thing, I know the fuel pump works, took cap off tried it, pumps,not sure of presure. You think vac. pump migh be bad? I installed a fuel pump couple of months ago, when probs began. Thanxs

 

Vacuum pump would have nothing to do with the engine run..

So,, backing up a little..

Was the reason for the dealer FICM repair/replacement done because of,, or due to,, a hard start, rough idle (that clears up as it warms) no start condition?

When the converter board (12v to 48v) inside the FICM module starts to fail, the results from the voltage drop are usually hard/no start, very rough idle and poor performance/misfire until the engine has run, and as it warms usually improves. As the convert board voltage failure increases, so do the running/start issues until it eventually won't produce enough voltage to start the engine.

You said you replaced the fuel pump "a couple months ago" when the problem began? Question is, meaning the issue was there 'prior' to the dealers repairs.

Or, you mentioned it ran 'fine' until you changed out the coolers and injector?

 

The reason I brought it to dealer was rough running when start, untill it warmed up, and loss of power on steep moutain grades. Before trip to dealership I replaced fuel pump on advice from a friend that said it was possible link to loss of power.Replcement of coolers and injector came after the visit to the dealership.

 

The reason for the injector cycle question was to determine if there is/was a problem with the FICM board, or if possibly one of the connectors wasn't seated correctly during an injector replacement.

Being it started multiple times after the oil cooler replacement would leave me to believe the reservoir was filled (?) during the oil cooler replacement. If by chance during the oil cooler or injector replacement a HPOP leak was created, may explain the problem now.

Without a scan tool available to help check for a minimum 500lbs of HPO to start the engine, if you have a DVOM you can check for 0,08 volts (500lbs) at the ICP. Being the FICM appears to be functioning, the fuel pump was ok and has been replaced with another, and given the repairs done that involve the HPO system, verifying the needed 'minimum' high pressure oil would be the next step..

 

Wont be able to get to my truck untill
Memorial day weekend, family vacation, will post after that.THANKS Hayapower, I have leared a lot so far.

 

O.K. Assuming I had the ICP, (it has 3 wires and behind manifold, located on the block,) disconected the wire and turned key on, did not have any voltage. Checked w/mult. meter, ground on battery neg term. The plug has 5 metal strips around the out side tested all.