2004 Rough Idle / Sluggish Performance

[buc1096]

Looking for some help. I'm helping my sister with her 04 350 that has 140,000 miles currently and completely stock. The truck is sluggish to start and idles rough kinda like a gasser with a fouled spark plug.

The FICM was replaced 8 months ago and test good at 48V. The truck has all synthetics and the egr valve was cleaned last month when I changed her oil and fuel filters.

I've also upgraded the fuel pressure spring and checked it running steady 62psi.

When I road tested the truck no CEL's showing and the power seemed like it
was running on less than 8cyl.

I took a video today so you guys could hear how bad it's running. Looking for suggestions of where to possibly get started to eliminate possible issues.

Thanks for the help.

[buc1096]

So I've done a little research on the 04 model and found the ICP sensor leaks or fails. I'm thinking this could be a good place to start, but not sure what I would need to do. I see the ICP is in the back of motor, how would I get to it and what would I need to test the ICP?

Thanks.

[southend]

How did you test ficm cold, were the batteries load tested? She needs a monitor.....Write Up: Monitoring the 6.0L PSD.

Make sure you are running motorcraft or racor filters with matching cap, and a good quality oil. The icp is just plain difficult to get to, the pigtail may also be bad. Get a monitor on that truck.

Sent from my phone that somebody didn't help me get.

[buc1096]

Originally Posted by southend

How did you test ficm cold, were the batteries load tested? She needs a monitor.....Write Up: Monitoring the 6.0L PSD. - Ford Powerstroke Diesel Forum

Make sure you are running motorcraft or racor filters with matching cap, and a good quality oil. The icp is just plain difficult to get to, the pigtail may also be bad. Get a monitor on that truck.

Sent from my phone that somebody didn't help me get.

The FICM was checked how ED @ FICMrepair advised:

1. Key off (0 volts)
2. Key on during buzz test (48 volts)
3. Key on after buzz test (48 volts)
4. Cranking (48 volts)
5. Running IMMEDIATELY after cold start and for the first minute (48 volts)
6. RPM's at 2000 after it's been started for a minute (48 volts)

All the filters I use are all motorcraft/racor, just like I use in my 05. I use the Rotella T6 synthetic in her truck for oil. I'm just thinking it might be ICP/IPR related possibly by the other threads I've read here. I've never actually had to deal with the ICP, so I'm unsure of procedures.

Thanks.

[southend]

You could also pull the egr and see if it is dirty or stuck open.

Sent from my phone that somebody didn't help me get.

[twoicebergs]

It sure sounds like an injector or 2. She really needs to have a cold injector buzz test and a cold contribution/balance test completed.

[04cr450]

^ definetly an injector or 2... Icp is prob. ok, batteries seem fine from the startup.. Get an injector buzz test first.

[kaya@bernhausen]

try disconnecting the icp and starting. see how it runs then

[buc1096]

I unplugged the ICP and it really didn't have any effect on how the motor ran, still the same. Does that indicate a good or bad ICP? I didn't see any oil around the ICP either. I'm going to arrange to take it to a shop and have a cold injector buzz test and a cold contribution/balance test completed as suggested.

[Heathrm]

If you started it with the ICP disconnected and there was no difference, the ICP is fine. If it had smoothed out, that might have been the culprit.

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