2002 f350 Help - Diesel Forum - TheDieselStop.com
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99 & up 7.3L Power Stroke Engine and Drivetrain Discussion of the 99 & up 7.3L Power Stroke diesel engine and drivetrain in the 1999-Up Super Duty trucks and Excursions. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 7.3L Power Stroke engine.

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Old 11-19-2012, 06:52 PM   #1 (permalink)
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2002 f350 Help

Hi everyone,
im new to the site but have read the threads here before looking for advice. Here's my problem. I have a 2002 F350 7.3L crew cab. It has a K&N intake, 4" downtube and exhaust, fuel tank mod and pre-pump filter installed and a TS Performance 6-Position chip. I installed the chip about 8 months ago and it was awesome. But for the last 2 months or so it seems to have lost power on all the tunes. Basically the 120hp tune feels more like a stock engine and if i put it on the stock setting it has little or no power. It still accelerates on the stock setting but is slow to do it. On 120hp setting it will still blow a little black smoke but nothing like it did when i first installed the chip. I did notice the ICP sensor has a little fuel in the plug so i know thats not good and i need to replace it but im asking if that sounds like my problem? or is it something else.


I know its a lot of reading but i trid to remember everything i could about what the truck is doing. If you have any other questions let me know. Thanks for the help in advance.

EDIT: Forgot to add that i have aftermarket gauges and the fuel pressure holds right around 68-70 psi. I changed the frame fuel pump about 2 months ago also but my problem started before the new pump. This new pump is louder than the stock one and it sounds like it revs up and down. I have read about IRP sensor also. Just looking for advice on where to look.

Last edited by 73Diesel; 11-19-2012 at 07:16 PM.
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Old 11-19-2012, 07:14 PM   #2 (permalink)
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Fuel filter, water seperator?
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'02 f-250 cc srw 4x4, auto, 4" exhaust, pillar pod w/ post and pre turbo egt, trans temp and boost, black brushguard/bumper, chrome step tubes. bully dog trans kit, ts performance 6-pos chip, stock, high idle, 50, 75, 100, 140, volant air intake

'08 f-350 cc drw 4x4, auto, mini max, 5" downpipe back exhaust. black ranchhand bullbar bumper, S&B intake.

both trucks bought in texas.
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Old 11-19-2012, 07:16 PM   #3 (permalink)
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Do you have gauges installed? Any idea what boost numbers you are seeing?
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Old 11-19-2012, 07:20 PM   #4 (permalink)
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fuel filter in fuel bowl was replaced about 2 weeks ago and didnt help.

Boost is normal. If i remember correctly it will boost to about 20 - 22psi and the turbo sounds normal. It starts fine and idles fine also
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Old 11-19-2012, 07:25 PM   #5 (permalink)
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If you were refering to the aftermarket fuel filter i installed pre pump. Yes it is a fuel filter/water seperator. Its the kit from Strictly Diesel. "Hutch Mod"
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Old 11-19-2012, 07:42 PM   #6 (permalink)
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20-22psi seems a little low for a 120 tune. I'm getting 17 stock. You might re-check your numbers and check for boost leaks and the condition of your turbo
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99.5 PS CC 4x4 SRW ZF-6
Triple Pillar Gauges; Fuel pres, Pyro, Boost
AE, Alldatadiy, and half a clue
- AKA "The Big White Truck"
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Old 11-19-2012, 07:51 PM   #7 (permalink)
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I have gone through all of the turbo hoses already and havent found any leaks. I only say 20-22 because thats as far as i remember and all i would push it. Maybe it went to 24psi. I have heard that you shouldnt take the stock turbo to more than 25psi but im not sure. The truck spools up and still pulls really hard. It just used to pull a lot harder when i first got the chip. And like i said it wont do anything on the stock tune. I was leaning more toward a fuel issue than an air issue.But im no expert. Im very handy around the shop and have been restoring origional ford bronco's for 15 years. So im not too shy when it comes to anything.
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Old 11-19-2012, 07:53 PM   #8 (permalink)
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I can look tomorrow and put the chip on the stock setting and see if it will smoke. If it does then do you think it would be turbo related? or am i thinking wrong.
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Old 11-19-2012, 08:09 PM   #9 (permalink)
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Try putting it in stock and see what max boost is. It shouldn't blow smoke unless the boost is real low.
There is a lot of discussion about the K&N filter and dust ingestion. Anything that gets past the filter gets to hit a compressor going 100,000 rpm's. It's like throwing gravel in a blender. If you pull the intake tube and look at the fins, they should be clean and sharp, not like they have been sandblasted.

As far as it being a fuel issue, it's possible. You would need to get a pressure check on it.
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99.5 PS CC 4x4 SRW ZF-6
Triple Pillar Gauges; Fuel pres, Pyro, Boost
AE, Alldatadiy, and half a clue
- AKA "The Big White Truck"
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The first part to be thrown at these trucks should be a PSD compatible scanner

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Old 11-19-2012, 08:16 PM   #10 (permalink)
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i was reading about the K&N filters. I will pull the tube off tomorrow and look. Like i said the fuel pressure to the HPOP is 68-70psi. And they hold pretty steady. But I can look into getting a second guage to put under the hood to confirm. Right now the aftermarket fuel pressure sending unit is located on the back/driver side of the fuel bowl. Is that the recomended or best spot for it?
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Old 11-19-2012, 08:24 PM   #11 (permalink)
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I believe the drivers side plug is pre-filter pressure. If you go to the passenger side rear, down a little lower, you can get post filter pressure. Not only is it post filter, but post check valve at the filter, which can be a baffling restriction to fuel pressure at times.
If you are holding 70psi on the fuel pressure, and it is still 70psi post filter, then fuel isn't the problem
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99.5 PS CC 4x4 SRW ZF-6
Triple Pillar Gauges; Fuel pres, Pyro, Boost
AE, Alldatadiy, and half a clue
- AKA "The Big White Truck"
______________________________________________
The first part to be thrown at these trucks should be a PSD compatible scanner

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Old 11-19-2012, 08:42 PM   #12 (permalink)
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Ok. I can move the sending unit tomorrow after work and see what the reading is. Since it doesnt take long and doesnt cost anything. When you say check valve do you mean the IPR?
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Old 11-19-2012, 09:02 PM   #13 (permalink)
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Not the IPR. That's the hp oil system. The black stem that the fuel filter goes on is a checkvalve that can restrict fuel to the injectors, normally getting fouled by it's own o-rings. There is also a checkvalve on both fuel lines as they enter the heads.
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99.5 PS CC 4x4 SRW ZF-6
Triple Pillar Gauges; Fuel pres, Pyro, Boost
AE, Alldatadiy, and half a clue
- AKA "The Big White Truck"
______________________________________________
The first part to be thrown at these trucks should be a PSD compatible scanner

PM please. No Visitor Msg if you want a response anytime soon
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Old 11-19-2012, 09:16 PM   #14 (permalink)
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Thanks. The lines your referring to would be the solid metal ones? Since i assume the flexible ones would be the hp ones. Is there anyway to clean or maybe replace them?
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Old 11-19-2012, 10:14 PM   #15 (permalink)
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Originally Posted by 73Diesel View Post
Thanks. The lines your referring to would be the solid metal ones? Since i assume the flexible ones would be the hp ones. Is there anyway to clean or maybe replace them?
That's correct. The 2 metal lines coming out the bottom passenger side of the filter are the fuel lines to the heads. The 2 metal lines on the drivers side are the supply (low-rear) and return (top front). The 2 rubber lines are the hp oil lines to each head. Yes, they can be cleaned up or replaced, but takes a special disconnect fork. If you search around in the FAQ section it tells you how to fabricate one. I would go the Simple Purple cleaner route since those lines are about $100 a pop.
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Tom
99.5 PS CC 4x4 SRW ZF-6
Triple Pillar Gauges; Fuel pres, Pyro, Boost
AE, Alldatadiy, and half a clue
- AKA "The Big White Truck"
______________________________________________
The first part to be thrown at these trucks should be a PSD compatible scanner

PM please. No Visitor Msg if you want a response anytime soon
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