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Old 07-01-2017, 10:19 AM
OuchThatHurt OuchThatHurt is offline
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Default 96 f250 runs like crap

Alright. Little history on the truck. Previous owner (2nd owner) had the truck for ~9 years and put 8k miles on it. Sat in his barn A LOT. Told me pretty much the only thing has done to the truck is swap glow plugs, change the oil and a new vacuum pump. Body is perfect... thought I stole it off this guy...

When i test drove it I noticed about 1800-2500rpm it bogged down pretty good like it was starving for fuel or air... then would clear up and pull hard at 2500+ rpm with full boost (by sound, no guage). After i run through this cycle the truck will also hunt while at idle and the the engine shakes pretty good... but if I drive super old man and just (basically) idle around town... it idles fine. Weird!

So the first thing I checked (after doing some googling) was the EBP sensor. Clogged up 100%. Even the fitting of the ex. Manifold was clogged. Got a new sensor and cleaned the line/fitting. (New line coming in mail, just gonna replace it) truck continued to run the same. Next I unplugged the ICP sensor to see what would happen at idle. The only thing I noticed is a slight rpm surge for the first second then would drop about 50rpm while unplugged. Plug it back in and would ramp up maybe 50rpm. (Tach doesn't show this... guessing by sound)

The bad part
Should have been first on the list... but I finally got around to checking the fuel filter. Holy crap! It was as black as an oil filter with 30k miles on it. It was slimy and gunky and I don't know how fuel was even getting through that sucker. Un believable! (Any ideas on if it was dirty or if it has bugs? Never seen a fuel gilter so bad in the last 9 years and im a Marine engine mech) Anyways drained the bowl and replaced filter. Still no change in driving characteristics. I'm gonna pull the filter again today and vacuum out the bottom of the bowl and the little return hole in the housing. (Maybe the return mesh filter is backed up?)

Next I Did the BB mod in case my pump was just struggling after the fuel filter was so bad for so long. No change so I took the BB back out.

Does anyone think the vlv in the exhaust side of the turbo is staying closed until I reach max boost and forces it open?

I'm also gonna drop the tanks as soon as possible and clean the screens in the pick up.

I know it's a long read but if any of you have any ideas of stuff I can check without throwing 150 dollar sensors at it... it would be a huge help.
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  #2  
Old 07-01-2017, 10:35 AM
ithumpwheniwalk ithumpwheniwalk is offline
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the ebp valve is very noticeable. I had a failure on my truck and it drove fine until the valve closed and then the truck slowed down and made a particular sound. It opened, closed and fluttered constantly until i wired it open. Certainly didn't make it run rough though.
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Old 07-01-2017, 10:46 AM
OuchThatHurt OuchThatHurt is offline
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Alright... I'll probably leave the ebpv alone then. Only time I hear it is at start up when I closes to let the truck warm up faster.
  #4  
Old 07-01-2017, 11:01 AM
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superpsd superpsd is offline
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Highly consider a scan tool of some sort.
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97-250 7.3 Eaton TVS Supercharged, S369sxe, R&D IDI performance T4 mount, my B350/200s, Honey Badger SR with My tunes, BMW M3 seats, Sky 5" RSK skyjacker drop pivot brackets, Sky shackles and hangers, Toyo M/T

1948 GMC Detroit 453T - 1945 Chevy C30 GM 451 - 1951 Mack A51T under restoration
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Old 07-01-2017, 11:28 AM
OuchThatHurt OuchThatHurt is offline
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Is there anything besides 350 bucks for AE? Any companies out there rent them?
  #6  
Old 07-01-2017, 06:24 PM
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ghohouston ghohouston is offline
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First things coming to mind are water in fuel after sitting so much/long
Bad injector o rings (would explain the black fuel filter)
Try unplugging the icp sensor and see if it changes anything.

Id also check the fpr screen
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  #7  
Old 07-02-2017, 08:46 AM
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Izzybird Izzybird is offline
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Quote:
Originally Posted by OuchThatHurt View Post
Is there anything besides 350 bucks for AE? Any companies out there rent them?
Check out Forscan, cheap..
  #8  
Old 07-03-2017, 11:38 AM
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I use Android device with OBDLink LX adapter. Torque pro and Car Gauge Pro. Under 100$.
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97-250 7.3 Eaton TVS Supercharged, S369sxe, R&D IDI performance T4 mount, my B350/200s, Honey Badger SR with My tunes, BMW M3 seats, Sky 5" RSK skyjacker drop pivot brackets, Sky shackles and hangers, Toyo M/T

1948 GMC Detroit 453T - 1945 Chevy C30 GM 451 - 1951 Mack A51T under restoration
  #9  
Old 07-03-2017, 12:22 PM
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TitoBandito78 TitoBandito78 is offline
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Every 7.3 runs like crap....part of "design".
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Old 07-04-2017, 08:14 AM
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Quote:
Originally Posted by TitoBandito78 View Post
Every 7.3 runs like crap....part of "design".

When it's stock, sure.


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