I have a 2003 6.0 with 120,000 miles. On the first start of every day (regardless of outside temperature) the truck quickly starts and then dies 2-3 times before it stays running. The start is usually accompanied by both white and black smoke that goes away after about 20 seconds. The IPR duty cycle at start up is 85%, but the icp is above 1000 psi and the truck always starts. After it is warmed up, the only problem is a small puff of black smoke under hard acceleration, and the truck starts easily the rest of the day. There is no rough idle, loss of power, etc.

The truck has a brand new FICM, oil cooler, Egr cooler, egr valve, icp sensor, icp pigtail, alternator, batteries, fuel filters, and 8 new injectors. The IPR screen is intact and clean.

Any ideas what could be wrong? Thanks!

 

What are the ICPV's at KOEO? Do you have any DTC's? You can have DTC's without a check engine light. Try parking the truck nose down and see if it helps the first start in the morning.

 

At first glance I would think stiction except temps seem to make no differenc.
I would then think maybe a weak fuel pump not keeping up with inital demand.
You would need to monitor everything involved with the injection/compbustion process and actual fuel pressure until the event happened [stall/die]. See what value/values changed.

Then you would know what needs changeing.

 

Sounds like its getting fuel and air for the 'quick starts' but not being maintained by high pressure oil. Id check icp volts first. You can very easily disconnect the sensor and see if anything changes

 

Extreme stiction can happen even at 70 degrees. However, that should be accompanied by lack of throttle response, hesitation once your under way.

GP circuit could be compromised, but you should have a CEL with that. Worth an ohm test test just in case.

The 85% during crank isn't good, even if you're seeing 1000+ ICP. Might try a restart with the ICP sensor disconnected.

No mention of Ficm volts KOEO, Crank and running?

Josh

 

Correct me if I am wrong,but IPR that high would mean oil pressure leak? STC? Valve is trying to compensate the low pressure, and cannot make it, mine only pulls about 20 or so at idle.

 

I think that was what Josh was getting at. Actual ICP pressure at 1000psi Ipr should have dropped a lot lower. Createing the condition you describe.

 

Oh yeah, that is assuming icp is working. Should have read more, pre posted sorry.

 

Do this. The hpop could be slowly leaking out the shift seal, having to reprise after it sits for a while.

 

I had the exact same thing happen to me about 6 weeks ago. Pulled the FICM and sent to Ed. He said it was good. I traced the problem to the FICM power relay.


Suggest you replace the FICM power relay. The contacts are probably pitted and it does not make good contact until the 2nd or 3rd try. If it is the relay, take it apart and you will see what I mean.


Ed

 

I checked the IPCV at KOEO, and it's at .22V, but there is a code (p2290) for a bad ICP. Considering both the sensor and pigtail are new I'm leaning toward a bad hpop, but wouldn't that usually cause running issues when the truck is warm rather than cold? I still have to try parking the truck downhill. Any chance a bad FICM relay could cause the icp code or high ipr duty cycle? Also, all FICM reading are 48V.

 

this. my '04 would do the same thing. HPOP leaking down when sitting. got worse over time, to the point where even noise down it would do it sometimes.