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#41
Sun, November 7th, 2010, 09:33 AM
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you are a long way away from me. Otherwise I would get it to you, to figure out.
I am looking at a different truck, that way I don't have these problems.
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Thank you and have a great day, Troy Detweiler I have a '99 F 250 7.3L Diesel w/ a 6 speed Tranny and 4x4. Mods: Amsoil dual bypass oil filters, Amsoil air intake mod DIY, fuel preasure spring mod(70psi), FU Chip and Burner , 3.73 rear gears, leveling kit (DIY), Stabilizer bars on the rear axle (DIY). '02 F 350 7.3L, 6spd,4x4,CC, Dually- Just bought 4-15-11 
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#42
Mon, November 8th, 2010, 09:02 AM
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Troy,
You need AT LEAST 340 PSI while the engine is luke warm. A HEALTHY engine will usually be in the 370-400+ PSI range. Anything lower will usually cause a miss until the engine warms up or the boost comes up a little bit. Low compression will usually be accompanied by white smoke from the exhaust that burns your eyeballs if you stick your face in it.
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Tuning, PCM flashing, and burning chips for 7.3s since 2008. Repairing all aspects of 7.3L Powerstrokes for 25 years. Eight 7.3L PSDs in the driveway including a 1994 Crown Vic and 1973 F100/2002 F350. Looking for the next victim.
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#44
Sat, November 27th, 2010, 09:27 AM
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Quote:
Here is what I have done since last post. Did the buzz test, everything sounds good on all 8 cylinders. Contribution test is good on all 8 also. I am lost as to what is going on here. Now the truck doesn't have the miss, but also has very low power even with the FU chip on 100 hp setting. It feels like the chip isn't even in the truck. my boost used to go to 26-28 psi now it only goes to 15 psi max, blows black smoke really bad. Even smokes on the idle, it is also black, sitting in garage for 3 to 5 minutes, when warm and idling, will burn your eyes really bad. Oh MPG is down to average of 8. I took the new injectors out of 7 and 8, put old ones back in, truck still has no miss, but the rest is still the same- no power, smokes on idle when warm, smokes driving it, with the FU chip in. Take chip out and everything runs perfectly. No smoke, no miss, nothing, and has power, contribution test good, buzz test good, boost up to 26psi, 16 mpg average. I am LOST Any ideas now? Ready to trade truck off, but can't with it running like this. Could there be thick oil trapped in a injector boss that causes the solenoid to buzz correctly but injector not work right??????
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Thank you and have a great day, Troy Detweiler I have a '99 F 250 7.3L Diesel w/ a 6 speed Tranny and 4x4. Mods: Amsoil dual bypass oil filters, Amsoil air intake mod DIY, fuel preasure spring mod(70psi), FU Chip and Burner , 3.73 rear gears, leveling kit (DIY), Stabilizer bars on the rear axle (DIY). '02 F 350 7.3L, 6spd,4x4,CC, Dually- Just bought 4-15-11
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#45
Sat, November 27th, 2010, 09:29 AM
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I have also thought that it was the chip connection. So I have pulled the chip out and reinstalled it, after checking the connections, still no different.
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Thank you and have a great day, Troy Detweiler I have a '99 F 250 7.3L Diesel w/ a 6 speed Tranny and 4x4. Mods: Amsoil dual bypass oil filters, Amsoil air intake mod DIY, fuel preasure spring mod(70psi), FU Chip and Burner , 3.73 rear gears, leveling kit (DIY), Stabilizer bars on the rear axle (DIY). '02 F 350 7.3L, 6spd,4x4,CC, Dually- Just bought 4-15-11
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#46
Sat, November 27th, 2010, 11:05 AM
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injection pressure is @ 730 psi, when cold, then drops to 602 when warm.
Now injector buzz test when engine cold: 1,2,3,5,6 all buzz good. 4,7,8 buzz slow. When engine warmed up: All buzz perfect, with new injectors in 7 and 8. Could this be an oil problem in the rails? Compression on all 8 cylinders is good: Cold - between 375 psi and 389psi Warm: 378 psi and 387 psi. When cold engine misses, when warm miss goes away. With or with out the FU Chip, now. I think the motor is possessed 
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Thank you and have a great day, Troy Detweiler I have a '99 F 250 7.3L Diesel w/ a 6 speed Tranny and 4x4. Mods: Amsoil dual bypass oil filters, Amsoil air intake mod DIY, fuel preasure spring mod(70psi), FU Chip and Burner , 3.73 rear gears, leveling kit (DIY), Stabilizer bars on the rear axle (DIY). '02 F 350 7.3L, 6spd,4x4,CC, Dually- Just bought 4-15-11
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#47
Sun, November 28th, 2010, 02:13 AM
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Do you have a good way to check fuel pressure?
I would be curious to see what the pressure actually is in the head. You can pull the 1/8" plug from the rear of the driver side head, and screw in a gauge to monitor this. Its possible that the check valve/ screen/ vibra-lok fitting at the end of the fuel line that feeds the head is restricted.
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#48
Sun, November 28th, 2010, 07:36 AM
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Quote:
How high does the gauge need to read, if I put it on the back of the head?
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Thank you and have a great day, Troy Detweiler I have a '99 F 250 7.3L Diesel w/ a 6 speed Tranny and 4x4. Mods: Amsoil dual bypass oil filters, Amsoil air intake mod DIY, fuel preasure spring mod(70psi), FU Chip and Burner , 3.73 rear gears, leveling kit (DIY), Stabilizer bars on the rear axle (DIY). '02 F 350 7.3L, 6spd,4x4,CC, Dually- Just bought 4-15-11
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#50
Sun, December 5th, 2010, 01:17 AM
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wow... im dying to know what ur problem is.. seems like youve done everything but swap out PCM with a different one. if you can get your hands on one, throw it on, if no changes throw it back on ebay and get your money back .. i just sold mine for $200 after my auto to manual swap. if you have allready ruled this out and i missed it on this thread plz disregard ... good luck
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