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Power Strokes 1994-1997 General Technical discussion of topics related to vehicles powered by the Power Stroke engine in 1994 through 1997 models.

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Old 02-14-2013, 11:33 AM   #1 (permalink)
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intermittant low boost

I am usually getting low boost, and when the rpm drops from a shift, the boost drops to the point there is no power. Anyone have an idea what the cause could be?
1997 7.3
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Old 02-14-2013, 02:30 PM   #2 (permalink)
 
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Originally Posted by 66CLEVE View Post
I am usually getting low boost, and when the rpm drops from a shift, the boost drops to the point there is no power. Anyone have an idea what the cause could be?
1997 7.3
It is normal for boost to drop down when you shift and your RPM's fall. What kind of boost are you seeing?
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Old 02-14-2013, 03:22 PM   #3 (permalink)
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it drops from around 6 to 3, so it's low to begin with, but like I said it's erratic; some days it works fine
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Old 02-15-2013, 03:48 AM   #4 (permalink)
 
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What kind of boost gauge are you using?
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Old 02-17-2013, 06:14 PM   #5 (permalink)
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it's just a mechanical pressure/vacuum gage. It acts like the accellerator pedal is barely depressed, when in reality. I have it nearly to the floor, but other times it's ok
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Old 02-24-2013, 11:34 AM   #6 (permalink)
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Mine has the same issue. At first I was thinking it was injectors (HPOP or actual injector issues) but now I'm not so sure. I haven't had time to test my valve cover harness connections or the injectors yet. But I have little boost at low rpm's - but as my rpm's increase - so does the boost. Anybody have any ideas as to what could cause this? Would poor fuel delivery cause it to "seem" like poor boost pressure?
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Old 02-24-2013, 04:31 PM   #7 (permalink)
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intermittant low boost

Does the truck feel sluggish? I was having this type of issue but worse turned out it was my EBPV being stuck it welded it self some how, pulled the turbo removed it and its good to go


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Old 02-25-2013, 04:47 PM   #8 (permalink)
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I warmed my engine up to running temp - then unplugged the EBPV in the open position - I read on here that this would stop it from closing at all. Mine used to try and stay closed until the motor got up to 170 degrees - I got tired of fighting it until it reached regular operating temp.
It used to HISS loudly when it was working - now there is no hiss at all - ever - just no boost until 1700 or more rpm's.
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Old 02-25-2013, 05:37 PM   #9 (permalink)
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intermittant low boost

I did the same thing unplugged it and I got no change, when I pulled the valve off some how it welded it self shut I had to hit it with a hammer and bar several times to get it to brake open, sure enough that fixed a lot of issues with my drivability also the IPR could be an issue


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Old 02-26-2013, 08:48 AM   #10 (permalink)
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Mine shows no codes - and unless it's below 30 degrees outside (and I don't plug her in) she starts right up every time. I don't hear the EBPV hissing at all - but I will check it to see if maybe it is stuck partially closed or is not moving freely. I thought that if my EPBV was holding back - my pyro gauge would run hot - but it stays at normal temps.
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