p1248 - Ford Powerstroke Diesel Forum

 
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post #1 of 7 Old 12-25-2009, 06:16 PM Thread Starter
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p1248

What are all the possible causes for trouble code p1248. I read that it is for no boost detected but what causes this - bad turbo, bad connections or what. Any help would be appreciated.


1997 F250 XLT 7.3 ENGINE

Extra Cab Longbed
285/75/16 BFG Tires
Standard Transmission
Heavy Duty Clutch
ATS Turbo, Intercooler
4" Straight Exhaust
K&N Air Filter
Superchips Programmer on Tow safe
Pillar Gauge Pod with AutoMeter Boost, Exhaust Temp
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post #2 of 7 Old 12-26-2009, 04:37 AM
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P1248
Turbo Boost Pressure Not Detected

Yep bad turbo, blown boot on the turbo/IC plumbing, not sure if a bad map sensor would cause the 1248 or not. I loaned my shop manual out to another member and haven't gotten it back!! So if you read this SEND ME BACK MY MANUAL!!!

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post #3 of 7 Old 12-26-2009, 04:45 AM
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Found this using Google in 10 sec. looks like I was right on.

P1248 possible fix MAP hose, sensor, EBP sys, intake leaks, turbo

I would pull the EBPS and check the tube for carbon deposits and clean with brake cleaner.

Why don't you tell us what the symptoms are???

NCH
Proud Father of USAF Airman


2000 F350 DRW,CC,LB, 4X4, Western Hauler Pkg.
Ford AIS/ BTM, FTVB
My CCV MOD, Coolant filter
06 Grill, 05 lights,6.0 trans cooler
Cyro/Hawks, JVC Touchscreen HU, JL C5's, Infinity 800watt amp,
DP tunes, 60 tow/80 e/120 race, on a SCT2 tuner
P3 controller, Brite Box Turbo Lifesaver
KMC Wheels x 4

http://s132.photobucket.com/user/NCH...=recent&page=1

Friends Don't Let Friends Drive Trucks With Generic Tunes
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post #4 of 7 Old 12-26-2009, 06:18 AM Thread Starter
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Truck seems to run fine - keep in mind this truck is new to me so I have very little seat time. Now, when I get up to say 1500 - 2000 rpm and try to stand on it I have nothing. Seems to be running strictly off the motor with no boost. I don't have my gauges yet so no way at this point in telling if I have low boost or none at all. Feels real bad if trying to pull a trailer. Compared to my pickup this truck has no power at all. The hissing is very loud when cold - which it has been but goes away like it should when the truck warms up. I looked over all the boots from the intercooler and didn't see any rips or tears so I guess maybe I have a bad turbo. Keeps throwing the same three codes (p1391, p1393 and p1248) I replaced the GPR with a Ford replacement part and it made no difference. I now have new valve cover gaskets and new glow plugs to install this weekend. I hope that will take care of the first two codes. This is starting to suck!


1997 F250 XLT 7.3 ENGINE

Extra Cab Longbed
285/75/16 BFG Tires
Standard Transmission
Heavy Duty Clutch
ATS Turbo, Intercooler
4" Straight Exhaust
K&N Air Filter
Superchips Programmer on Tow safe
Pillar Gauge Pod with AutoMeter Boost, Exhaust Temp
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post #5 of 7 Old 12-26-2009, 01:32 PM
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Quote:
Originally Posted by gmaredd View Post
Now, when I get up to say 1500 - 2000 rpm and try to stand on it I have nothing. Seems to be running strictly off the motor with no boost. Feels real bad if trying to pull a trailer. Compared to my pickup this truck has no power at all. !
Sounds like a turbo.


"Late" 99 F250
Crew Cab, Short Box
Straight piped (no muffler but rest of exhaust stock), 35" BFG A/T
DIY NAPA 6637 Intake
Zoodad mod (my version of it)
Leveling kit
TW Chip
NOW NEED WW b/c TW is giving me turbo surge
Future needs:
Guages
Exhaust System with Down Pipe and muffler (to help pass PA inspection)

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post #6 of 7 Old 12-26-2009, 02:28 PM Thread Starter
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Update

Found a wire that has been disconnected from the GPR for what looked to be a long time from the previous owner. Re-connected it in the correct place, cleared the codes and it seems to be much better now and actually can hear the turbo whistle a little. I really believe that with the SES light on the PCM was controlling the fuel and making it so no boost could happen (some sort of limp mode). I also checked the MAP sensor and line from the MAP (which was very clean) and all seems to be much better. Now after sitting overnight in the cold I am sure the p1391 and p1393 codes will come back - these should be corrected with the new valve cover gaskets and glow plugs we will install tomorrow. Man I hope I am making some progress and don't need a new turbo.


1997 F250 XLT 7.3 ENGINE

Extra Cab Longbed
285/75/16 BFG Tires
Standard Transmission
Heavy Duty Clutch
ATS Turbo, Intercooler
4" Straight Exhaust
K&N Air Filter
Superchips Programmer on Tow safe
Pillar Gauge Pod with AutoMeter Boost, Exhaust Temp
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post #7 of 7 Old 12-26-2009, 06:21 PM
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Good to hear! sounds like someonee was just goofy enough to leave something unplugged!
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