Lag @ 1550 Rpm / FICM-Turbo Issue? - PowerStrokeNation : Ford Powerstroke Diesel Forum
 
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post #1 of 7 (permalink) Old 03-01-2015, 04:11 PM Thread Starter
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Lag @ 1550 Rpm / FICM-Turbo Issue?

Ok, so I've got one of the early 2003 6.0Ls with 250,000 miles on it. I stopped driving this as my daily driver at about 150k, and turned it over to one of our landscaping crews. Recently, we've had a host of issue regarding power so we've kicked it over a few times to the local mechanic who has successfully worked on it in the past.

Over the past 1-2 years, we've had the majority of the injectors replaced, turbo replaced within the past year, ICP & IPR sensor, fuel regulator, and some other misc items replaced.

Yesterday, I cut out and wired out a replacement FICM x3 pigtail, as the tabs had worn off and we were losing connectivity at the slightest touch of that connector to the FICM. With the new connector on, I no longer get any "stall" type results when touching this connection while the truck is parked. Seemed the connector solved that issue. All new wire connections were soldered, and then placed in heat-shrink tubing. I wrapped all new wires with heat-reflective tape, as the original wire jackets were melted together pretty good.

However, I took the truck for a test drive this morning, and got about 5 miles down the road and started to experience some issues around the 1550rpm range, that lasted until about 2200/2500rpm range.

I ran the truck with WOT as much as I could initially, and it responded great. It was really nice to drive this truck again, as it was the first vehicle I ever bought when I was 18 years old back in 03. At around 5 miles into my test drive, I was doing approximately 40-50mph.

I then turned on to some residential streets, which required that I slow down along the turns, and that's when I began experiencing some lag & issues around 1550 rpm. When I began driving from a dead stop, I experienced what felt like a fuel delivery issue around 1550rpm, but kept pushing down the pedal with a WOT, and pushed through any lack of power. It felt like a sputter/intermittent fuel delivery. However, when I backed off the throttle and came into the 2000 rpm range, I experienced what felt like a premature turbo blow back/waste gate discharge. I could hear the air being discharged from the turbo excessively during times that I would expect the engine to just throttle down without any noticeable sounds from the turbo.

Not sure if this is related, but I noticed the air was blowing through the defrost. I quickly chased this down to a disconnected wire connector on the vacuum pump, which then ran for a minute or so to build back up and then the a/c blew from the vents fine. I assume the vacuum operation of the truck cannot be related to any of the acceleration/throttle/turbo issues around the 2000rpm range, but wanted to mentioned it just in case.

No check engine light, but I also haven't hooked up a scanner to it yet.

Thoughts?
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post #2 of 7 (permalink) Old 03-02-2015, 12:32 PM
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Re: Lag @ 1550 Rpm / FICM-Turbo Issue?

You need a scanner of some flavor to narrow this down.

05 F350 cclb dually, egr delete, blue spring upgrade, coolant filter, cat and muffler delete, scanguage II
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post #3 of 7 (permalink) Old 03-04-2015, 07:57 PM Thread Starter
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Re: Lag @ 1550 Rpm / FICM-Turbo Issue?

Truck ended up throwing codes. All cylinders misfire. Believe it to be low voltage on FICM as it was around 45-46.

Yall concur? Would like to get the modded 52v FICM. Any recommendations as to a trustworthy source for these? Found places online, but would rather hear from yall.

thanks.
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post #4 of 7 (permalink) Old 03-04-2015, 08:04 PM
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Re: Lag @ 1550 Rpm / FICM-Turbo Issue?

All cylinders with problems definitely sounds ficm related. Would test under all conditions to rule out anything else. There are vendors here that can hook you up with a 58v ficm no problem.
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post #5 of 7 (permalink) Old 03-12-2015, 04:58 AM Thread Starter
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Re: Lag @ 1550 Rpm / FICM-Turbo Issue?

So the new FICM is in, and still same issue once the truck heats up. I'm thinking it has something to do with some sort of pressure sensor for the turbo.

There is a hose that goes into the cover right in front of the FICM. I noticed its very loose, and appears to be missing an o-ring. Could this be the issue?
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post #6 of 7 (permalink) Old 03-12-2015, 05:04 AM Thread Starter
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Re: Lag @ 1550 Rpm / FICM-Turbo Issue?

After looking at the 6.0 bible that was posted as sticky, it appears to be crankcase ventilation. Would that have any affect on turbo?
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post #7 of 7 (permalink) Old 03-15-2015, 08:10 PM Thread Starter
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Re: Lag @ 1550 Rpm / FICM-Turbo Issue?

Unplugged the wire connection at the EBP and the issue stopped. I'm guessing there is a wire issue or EBP sensor issue causing the turbo to malfunction. Ordered a new sensor from O-Reillys and will plug it back in to see how it pans out. Anything wrong with just leaving it unplugged?
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