Fuel response issues - Ford Powerstroke Diesel Forum
 
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post #1 of 9 Old 01-21-2012, 09:01 AM Thread Starter
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Fuel response issues

I posted this in another section thought it may get some traffic over here. It also dawned on me that this could be a TPS but why only at higher RPM's?

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When I get up to speed i loose the ability to speed up unless I push on the fuel hard enough to make it down shift. When it does then it jumps as if I had throttled up but I have that huge dead spot where i push on the peddle and nothing happens. After I step down and get it to shift then the control returns to normal until I cruise for a bit.

I have a recent post where the truck went down and they replaced the injector controler and the fuel pump. When they did that they upgraded the software and flashed my ecm. I have a Sniper 40 hp chip in the truck that has a secondary feature of a high idle switch.

What I am wondering is the chip made for older software and interfearing with the new set up.

Any guidance will be appriciated.

1999 F-250 4X4 Crew cab Lariat short bed junk hauler. Truck is used for daily hauling of steel. 26000 lbs or less. No performance mods other than larger exaust. Wanted this truck since it came out in 99.

WHAT it only took me 7 years to buy it!!

Chevrolet 6.2 convert so as you can bet I am thrilled with the power of the Powerstroke!
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post #2 of 9 Old 01-21-2012, 04:43 PM Thread Starter
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Help Still same problem no solution yet.

1999 F-250 4X4 Crew cab Lariat short bed junk hauler. Truck is used for daily hauling of steel. 26000 lbs or less. No performance mods other than larger exaust. Wanted this truck since it came out in 99.

WHAT it only took me 7 years to buy it!!

Chevrolet 6.2 convert so as you can bet I am thrilled with the power of the Powerstroke!
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post #3 of 9 Old 01-22-2012, 10:32 AM
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Sounds like fuel pump

2000 F550 DRW. 4x4 manual Trans
AIH delete
Glow shift guages
98gal transfer flowtank
Riffraff 6637 kit
Ccv mode
Wicked wheel
4" mbrp
PAC brake with aux air tank to air stuff up
TS chip 6 pos
Riffraff hpx crossover
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post #4 of 9 Old 01-22-2012, 11:13 AM Thread Starter
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That stinks, They just put a new one in. It acts to me like a sensor, maybee throttle position sensor?

1999 F-250 4X4 Crew cab Lariat short bed junk hauler. Truck is used for daily hauling of steel. 26000 lbs or less. No performance mods other than larger exaust. Wanted this truck since it came out in 99.

WHAT it only took me 7 years to buy it!!

Chevrolet 6.2 convert so as you can bet I am thrilled with the power of the Powerstroke!
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post #5 of 9 Old 01-22-2012, 11:36 AM
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Could maybe throttle pos if u have new pump but hard to tell if no gauge for fuel

2000 F550 DRW. 4x4 manual Trans
AIH delete
Glow shift guages
98gal transfer flowtank
Riffraff 6637 kit
Ccv mode
Wicked wheel
4" mbrp
PAC brake with aux air tank to air stuff up
TS chip 6 pos
Riffraff hpx crossover
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post #6 of 9 Old 01-22-2012, 12:22 PM
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Whats your fuel pressure?

What!? You dont have a fuel pressure gauge so you dont know? c'mon man! Install a fuel pressure gauge!! Every super duty should have one. Even if its the cheap $50 versions that mount onto your alternator.

Nonconformist. Functionality over bling.

My three rules for 7.3l troubleshooting: 1) Replace CPS and keep a spare. 2) Replace FPR and know your fuel pressure. 3) Hook it to a scanner and check for codes.
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post #7 of 9 Old 01-22-2012, 04:15 PM Thread Starter
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I don't have a fuel pressure gauge, really I just want to get it running normal I really don't want or need a long list of modifications in my signature. Guess I am back to the dealer on Monday.

1999 F-250 4X4 Crew cab Lariat short bed junk hauler. Truck is used for daily hauling of steel. 26000 lbs or less. No performance mods other than larger exaust. Wanted this truck since it came out in 99.

WHAT it only took me 7 years to buy it!!

Chevrolet 6.2 convert so as you can bet I am thrilled with the power of the Powerstroke!
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post #8 of 9 Old 01-23-2012, 10:21 AM
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In no way is a fuel pressure gauge deserving of a line item in a signature. EVERY super duty should have had one from the factory and i have no idea why Ford didnt do it. Its incredibly beneficial for the longevity of your truck as well as trouble shooting. I wish i would have had one immediately upon inspection of my truck and at $50, its a bargain. You will spend more than that for the dealer to simply open the hood.

Nonconformist. Functionality over bling.

My three rules for 7.3l troubleshooting: 1) Replace CPS and keep a spare. 2) Replace FPR and know your fuel pressure. 3) Hook it to a scanner and check for codes.
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post #9 of 9 Old 01-23-2012, 02:36 PM Thread Starter
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There are lots of little things I think ford should have added to help the owner of these trucks.

The fuel response issue worked it's self out. The truck acts like normal today. We will see how long it lasts.

1999 F-250 4X4 Crew cab Lariat short bed junk hauler. Truck is used for daily hauling of steel. 26000 lbs or less. No performance mods other than larger exaust. Wanted this truck since it came out in 99.

WHAT it only took me 7 years to buy it!!

Chevrolet 6.2 convert so as you can bet I am thrilled with the power of the Powerstroke!
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