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Old May 7th, 2012, 09:39 AM   #1
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Default OBS powerstroke woes

Okay, normally I can see up to 17-19 pounds of boost, and when towing my set-up I typically average 14-16 mpg. Occasionally can see 1400 degrees in the exhuast for short burts when pushing hard.

On my way back to twisted saturday I noticed truck was a little gutless and I couldn't clear 6-7 pounds of boost and my mileage was 11ish. On the way home yesterday same deal could not clear 6 pounds of boost, and no matter how hard I pushed the truck the egt's would not go higher then 1250 degrees and felt even more gutless then saturday. It had no smoke of any color from exhuast. RPM's were not an issue I could easy push up to 3k.

I got home yesterday and checked the air filter which was fair, and pulled the inlet off and looked at the wheel and the blades look fine and reached in and felt no end play or wiggle to it.

This morning I replaced the fuel and air filters with no change, ran a contribution test with all passing. No codes in system.

ebv psi seems to read about 15 psi about 50 mph
ICP voltage about 1 cruising and 3.0 WOT
Inj control pressure approx 2500 at wot
Map at idle 14 psi and approx 22 wot

Gonna try and wire the ebv open. I have always had issues with the ebv when the truck was cold or at start up not plugged in regardless of temp outside. But once warmed up has always opened with no issues. I would think if the ebv was restricting my boost then when I pushed hard on the highway the egt's would reflect it. Also I have had the two wire connector for the actuator below the turbo inlet unplugged for quite some time. However the ebv still seems to operate with it unplugged, it was my understanding that when unplugged it would not open/close on its own.

if I had to explain it simply, it feels like a gas motor with a restricted cat converter.

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Old May 7th, 2012, 10:15 AM   #2
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However the ebv still seems to operate with it unplugged, it was my understanding that when unplugged it would not open/close on its own.
IIRC, it should stay open when it is unplugged. Can you move the EVB by hand when it is unplugged?

when was the last oil change?
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Old May 7th, 2012, 10:17 AM   #3
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I've disconnected my '99 at the sensor and at the actuator and still have issues with it some times.
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Old May 7th, 2012, 10:21 AM   #4
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I'm assuming there is no aftermarket or added IC?

No up pipe leaks or anything?

I've heard of EGT's doing things contradictory to what i would think so I'm no help there. Any chance there's something wrong with the turbine side and its simply not spinning the compressor fast enough?
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Old May 7th, 2012, 10:26 AM   #5
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IIRC, it should stay open when it is unplugged. Can you move the EVB by hand when it is unplugged?

when was the last oil change?
about 60 miles before the trip this weekend, approx 400 since change. I have not physically tried to move the valve by hand yet. Kinda working on it between jobs at the shop.
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I'm assuming there is no aftermarket or added IC?

No up pipe leaks or anything?

I've heard of EGT's doing things contradictory to what i would think so I'm no help there. Any chance there's something wrong with the turbine side and its simply not spinning the compressor fast enough?
Exhuast tone doesn't sound out of place or restricted like it does when the valve is def fully closed.

Only mod is downpipe and straight 4" pipe from downpipe. Truck has never had a tuner or programmer on it.
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Old May 7th, 2012, 01:27 PM   #6
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Was your ICP 2500 when it was acting up?

Kinda sounds like it was short on fuel, if the EBPV was closed I would think you would have heard a difference and seen some smoke.
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Old May 7th, 2012, 01:28 PM   #7
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Maybe a plugged pickup in the tank or fuel pump issue, may need to put a FP gauge on it.
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Old May 7th, 2012, 01:50 PM   #8
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Same symptoms on both tanks. It doesn't act up as in come and go, its just gutless with very low boost output (of course if my gauge is reading accurate).

I disconnected the linkage arm from the butterfly, there was a stiff spot in the rotation of the butterfly but just a small hicup. I could not move the rod when it was connected to the actuator with the motor unplugged and truck off, I could move it once disconnected from the accuator.

I wired it open (atleast I assume open) and felt no change. I had a coworker fire it up and I moved the butterfly and this was where it was at when the bracket was against the stop on the housing, when pushed the other way to lock I could here the back pressure build in the turbo.




It has the oe fuel pump in the motor valley (252K on it). I had the fuel bowl out last year and replaced leaking rubber lines and the bowl heater. The ICP sensor was replaced last summer with a motorcraft as well. Both valve cover gaskets/harness's were also replaced last summer.

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Old May 7th, 2012, 01:56 PM   #9
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Can you get a fp gauge on it?
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Old May 7th, 2012, 02:04 PM   #10
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@ idle 70 psi with a 3 psi swing or pulse in the needle. With key off drops to 50 psi and gradually loses pressure very slowly.
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Old May 7th, 2012, 02:06 PM   #11
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WOT under load?
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Old May 7th, 2012, 02:16 PM   #12
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@ idle 70psi with a 3 psi pulse.

The more throttle the bigger the pulse. @ wot its like 50psi violent swing on the needle ranging from 20 psi to 100 psi. So fast in pulsing its hard to see the needle.
The motor was more up to temp on this test drive then the last. This last test drive was the first time I have cleared 6psi of boost. I was able to hit 10 psi that time. Running it wot to 80 mph with overdrive off.

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Old May 7th, 2012, 02:47 PM   #13
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Pulled the fuel block off the side of the bowl and the metal screen had a healthy layer of gunk on it. Gonna go drive it in a few minutes.
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Old May 7th, 2012, 06:22 PM   #14
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Still doesn't feel right, but I can now and then see 10 psi of boost.
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Old May 7th, 2012, 06:47 PM   #15
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Try this....

The EBP SENSOR, there is a tube that connects to the pass. side exhaust manifold. This tube looks like a brake line and goes to the front of the engine just behind but ontop of the pulleys. This tube will get plugged up with exhaust sot. From my readings some after market tunes use this for fuel mapping, and also it is used for trans shifting.

I looked at mine the other day since the truck always shifted funny. The tube was rusted in half and blocked by crap. Just ordered a new tube today from Oriley.

Some people say they loose boost when this gets plugged. Worth a shot.


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Old May 7th, 2012, 06:58 PM   #16
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Looks like I got a shit ton to learn if I pick up a 97 PSD crew cab. You guys are speakin japanese to me.
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Old May 7th, 2012, 08:13 PM   #17
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I have already had the tube off, cleaned, and replaced the sensor at the end of it. I did all that last summer when I was chasing the EBV problem.

But that was last summer, probably worth taking another look at and removing for giggles to see if it replugged or not.
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Old May 7th, 2012, 08:34 PM   #18
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I heard of people doing it at every oil change. Check to see if its cracked.
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Old May 12th, 2012, 06:14 PM   #19
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Haven't done anything yet, just parked it and been driving the explorer. But been thinking...

When the tube was plugged and the sensor bad before, I had no noticeable issues outside of the driving when the truck was cold. Still gonna pull it anyways and check it.

But if I have lack of boost, but have no issues with rpms or getting to high rpms quickly, and no restrictions in the inlet/outlet of the system as far as exhaust and air filter. If I can easily get to 3K in rpms shouldn't it still build normal boost pressures regardless of any sensors or similar not working right messing with fuel?

I could see struggling with rpms and not getting boost, but I have no issues getting up to high rpms.
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Old May 12th, 2012, 06:59 PM   #20
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Of course my boost assumption is 100% dependent on my boost gauge working right. And yes I have double checked the line to it.
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