Still no start when hot!!!! - Ford Powerstroke Diesel Forum
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Old 08-05-2013, 04:47 AM
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Still no start when hot!!!!

Hey guys, i was having a hot no start issue so i decided to take the motor apart to change the STC fitting. When i got it apart i noticed it already had the new fitting, but i still changed it out with a new one. Then i changed out the dummy plugs and Standpipes. Again they where also changed to the updated ones but figured why not change it out anyway.

Once i put it back together and got it started up I figured the no hot start would have been cured but still not starting when hot.

Im not sure where to go from here???? What else should i replace?

2006 F250
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Old 08-05-2013, 05:30 AM
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A no strart when hot, a lot of times comes from the HPOP overheating. How old is the HPOP and have you changed the oil cooler?
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Old 08-05-2013, 05:32 AM
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Sometimes the branch tubes leak too
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Old 08-05-2013, 05:35 AM
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I forgot to say, do an air pressure test before you rush into replacing an HPOP. you could have a leak somewhere.
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Old 08-05-2013, 07:08 AM
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Not sure if the oil cooler has been serviced or cleaned. I could do that next. Also how likely would it be for the branch tubes to leak or fail? that seems like it would be a real pain to change.

What about a bad ICP?
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Old 08-06-2013, 12:43 PM
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Ok guys ive done some testing. All of these numbers where taken while the engine was at operating temperature. Again, SCT, dummy plugs, and stand pipes replaced already.

My scangauge shows this when @ full throttle pass
FICM 47.5
IPR 84.7
ICP 2820 @20lbs boost

half throttle or a little less
FICM 47.5
IPR 84.7
ICP 2158 @18lbs

Idle in park
ICP 580
IPR 23.4

Hot no start issue
ICP 84.7
ICP 365
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Old 08-06-2013, 01:02 PM
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Quote:
Originally Posted by proamas View Post
Ok guys ive done some testing. All of these numbers where taken while the engine was at operating temperature. Again, SCT, dummy plugs, and stand pipes replaced already.

My scangauge shows this when @ full throttle pass
FICM 47.5
IPR 84.7
ICP 2820 @20lbs boost

half throttle or a little less
FICM 47.5
IPR 84.7
ICP 2158 @18lbs

Idle in park
ICP 580
IPR 23.4

Hot no start issue
ICP 84.7
ICP 365

Oil leak somewhere for sure. That 2820 should be higher at full throttle imo. 365 no start is a good indicator, it needs to see 500, psi before it'll let the injectors fire. Ever replaced injector of rings and check the oil rail nipple o rings too.
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Old 08-06-2013, 01:19 PM
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Quote:
Originally Posted by powerstrokecrzy View Post
Oil leak somewhere for sure. That 2820 should be higher at full throttle imo. 365 no start is a good indicator, it needs to see 500, psi before it'll let the injectors fire. Ever replaced injector of rings and check the oil rail nipple o rings too.
Thats what i was thinking, i need to find an adapter so i can do an air test on it. we have harbor freight out here and was going to look there. Im really hoping its a leaky injector now only. How often do the oil nipple rings go bad?

Any help on finding an adapter for the ICP fitting to do the air test would be helpful.
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Old 08-06-2013, 01:59 PM
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And the IPR shouldn't be commanding that high. It's compensating for the lack of pressure being generated
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Old 08-07-2013, 03:36 AM
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Ok so i've done a little more trouble shooting. On my way into work this morning, 20 mile drive the engine oil temp was at 234 F, and the engine coolant temp was at 198 F. This trucks previous owner did the EGR cooler delete with freeze plugs, and i dont have the EGR cooler log anymore.

So from that it looks like i definitely need to replace the oil cooler also correct?

Is it ok to wait?
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