I've got some behavior that does not seem normal - hope you can point me in the right direction. My 2003 6.0L has turned 100K miles recently. I have replaced the turbo, HPOP, IPR, ICP sensor, EGR cooler, and installed the Bulletproof Diesel external oil cooler. I have also checked out my FICM and the voltages appear normal. I have the 185 amp alternator, and my batteries don't show any problems. The truck has never had any serious issues like coolant puking, etc.

Here is what I have observed of late. Upon startup, especially after the truck has been run and then sitting for a little while, the idle speed will waver up and down. It is enough that you can hear it, and I see it on the tach. I have the idle speed controller, so I get a direct readout of engine rpm. Typically it might jump from 620 to 635, then to 605, and on and on for a while. It doesn't wander so much as it steps from one value to another every few seconds. Once I run it around for a while longer this goes away.

I intend to run the AutoEnginuity software and monitor the key parameters while this is happening - what parameters would you watch? The truck seems to be running otherwise OK, so I wonder what might be causing this? Your thoughts/suggestions are appreciated.

Doug

 

watch ICP and IPR% as it jumps see if those follow

where did you get the HPOP

 

If it had the BPC High Idle then I would blame that.
But I don't think you have that with your year.


Sean

P.S. Benny how are things?

 

The HPOP came from Ford. It was the second one I had installed, as the first one failed after a couple of weeks. When the first one failed, it left some trash on the screen of the ICP sensor. This was cleaned and another HPOP from Ford installed. We made sure the second HPOP came from another lot code. It might be possible that all the trash from the first HPOP did not get flushed out.

I did recently install an oil pressure sensor on the test port of my Bulletproof oil cooler. This let some oil escape and some air enter the system - is it possible the air is working its way out? I have heard that once air enters the system it can take a while to get out.

I will monitor ICP & IPR with the Autoenginuity to see what these do. One other question - I know that Ford implemented a scheme which cycles the turbo vanes at idle. Where does this strategy "live"? Would it be in the PCM? I run an aftermarket tune. When the turbo vanes cycle, can you hear it or feel it?

Thanks.

Doug

 

The turbo cycling is in the PCM.
If you don't have you fool on the throttle for
x amount of time it will start doing it's thing.
You can hear it run up and down.


Sean

 

I've posted my Dashboss parameters at idle for my 6.0 after changing out two injectors and running very smooth. You might reading my post #11 to compare with your data.

https://www.ford-trucks.com/forums/1...u-monitor.html

 

[QUOTE=Yahiko;14633669]The turbo cycling is in the PCM.
If you don't have you fool on the throttle for
x amount of time it will start doing it's thing.
You can hear it run up and down.


and just to add you should see VGT change when you Hear it

it should be a substaintial diff in VGT Like 65- 75 the 15-20 then back to 65-75 on the VGT Numbers are Only close its been a Few since I watched mine

the custom tune may also change its affects depending whats written in the tune

 

Being drunk and bored

 

OK I've started to run some data using Autoenginuity. I see plenty of HP oil pressure. The idle will wander slightly, but I am still trying to get it wandering in a big way.


In the meantime, I see the ICP holds steady, while the ICP voltage wanders. The ICP is around 635, but the ICP voltage will wander from 0.85 to 0.95 volts or so. Can somebody explain this? I would think the PCM would read the voltage and compute the pressure based upon a lookup table. So if the voltage wanders, why doesn't the ICP? It looks to be a slope of about 100psi per 0.1V, so the ICP variation is not hiding from sight. I suppose I might also wonder why the ICP voltage is varying when the idle RPM is not.


Does this start to look like a flaky ICP sensor? Note that I had the sensor and the connector replaced just a few months ago.


Thanks in advance for any advice you can provide while I keep scanning.


Doug

 

Look at the fuel injection timing pulse.
I bet your going to see it change by a
few ms or so.


Sean

 

Problem solved - the new pigtail for the ICP sensor had a loose crimp connection. The behavior sure did sound like some sort of ICP issue, even though I had already replaced the HPOP, ICP sensor, pigtail, and ICPR.

Thanks for your suggestions.

Doug