Diesel acceleration?
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Diesel acceleration?
I've never owned or driven a diesel before buying my current truck ('85 F350 crew/dually with 7.3 IDI). Not sure how smoothly/quickly it should accelerate.
Truck starts & runs perfectly. However, upon acceleration, it seems like there is a choke on or something. Just doesn't have the "oomph" and feels as if there's a rag over the air intake...kinda like a gasoline engine with the choke stuck on.
Any ideas as to the problem or is it supposed to be this way?
Truck starts & runs perfectly. However, upon acceleration, it seems like there is a choke on or something. Just doesn't have the "oomph" and feels as if there's a rag over the air intake...kinda like a gasoline engine with the choke stuck on.
Any ideas as to the problem or is it supposed to be this way?
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does this happen all the time or just when it is cold?
if it happens all the time, you could have a fuel delivery problem such as dirty injectors, a bad pump, dirty filter, it could really be a number of different things.
if it happens all the time, you could have a fuel delivery problem such as dirty injectors, a bad pump, dirty filter, it could really be a number of different things.
Mountain Pass
Joined: Sep 2005
Posts: 235
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From: West TN
When someone asks how my F250 accelerates, I tell them 0-60 in less than 20 seconds, empty or pulling their vehicle. 
Do you know anyone with a similar setup you could compare it to? Maybe hit a car lot and test drive if not? Diesels are a very different beast than gassers.
Do you know anyone with a similar setup you could compare it to? Maybe hit a car lot and test drive if not? Diesels are a very different beast than gassers.
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Originally Posted by 12V
does this happen all the time or just when it is cold?
if it happens all the time, you could have a fuel delivery problem such as dirty injectors, a bad pump, dirty filter, it could really be a number of different things.
if it happens all the time, you could have a fuel delivery problem such as dirty injectors, a bad pump, dirty filter, it could really be a number of different things.
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sounds like a fuel delevery problem. start checking all of the components........ start at the motor, work back to the tank.
has the filter been changed in a while?
are the injectors dirty, or old and worn out?
do you have any leaks in the fuel system? lines?
kinks in the fuel line?
dirty air filter?
it could really be a number of different things
has the filter been changed in a while?
are the injectors dirty, or old and worn out?
do you have any leaks in the fuel system? lines?
kinks in the fuel line?
dirty air filter?
it could really be a number of different things
Post Fiend
Joined: Nov 2003
Posts: 21,285
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From: Nutter Fort, WV
Danny_Ocean,
The 85 should have a 6.9 unless it has been changed.
Next thing to consider is the 6.9 has about 170 HP.
The 7.3 has about 185 HP.
A crew dually is going to be a rather heavy truck.
So it is not going to press you back in the seat from G force when you take off.
The beauty of diesel is you can throw a ton in the back, and it will still take off about like it does now. And the other thing about a diesel is if you take care of it, you can expect it to take off like it does now for the next 15 or 20 years.
The early diesels were not hot rods, they were work horses.
I have hauled thousands of tons of dirt and rock with mine over the last 20 years. It is ready to go load up right now.
The 85 should have a 6.9 unless it has been changed.
Next thing to consider is the 6.9 has about 170 HP.
The 7.3 has about 185 HP.
A crew dually is going to be a rather heavy truck.
So it is not going to press you back in the seat from G force when you take off.
The beauty of diesel is you can throw a ton in the back, and it will still take off about like it does now. And the other thing about a diesel is if you take care of it, you can expect it to take off like it does now for the next 15 or 20 years.
The early diesels were not hot rods, they were work horses.
I have hauled thousands of tons of dirt and rock with mine over the last 20 years. It is ready to go load up right now.
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Originally Posted by trike1946
Some of will depend on the rear ratio. Do you know what it is?
Have you done anything to the air cleaner, or exhaust to improve performance?
Have you done anything to the air cleaner, or exhaust to improve performance?
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Originally Posted by Dave Sponaugle
Danny_Ocean,
The 85 should have a 6.9 unless it has been changed.
The 7.3 has about 185 HP.
The 85 should have a 6.9 unless it has been changed.
The 7.3 has about 185 HP.
I'm not complaining about the power. It pulls like a freight train. However, upon acceleration, it feels as if there's a sock in the air intake. Not sure if this is normal, as I'm used to smooth, steadily increasing acceleration from gasoline engines.
Post Fiend
Joined: Nov 2003
Posts: 21,285
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From: Nutter Fort, WV
I think what is causing that feeling is that max torque is in the 1500 RPM range.
So at that RPM the engine feels much stronger than it does up at the 3000 RPM max HP range.
A turbo would change that feeling.
What do you have for an intake?
The stock intake is a bit restrictive, and have you removed the soup bowl from under the air cleaner lid?
Both mods will give small gains in engine responsiveness, also with the exhaust mod you have done, you should be getting plenty of air out of the engine. Now you need to get more cool air into the air cleaner and engine.
https://www.ford-trucks.com/user_gal...photoid=100545
This is a mod on my truck for ram air. Does a nice job. But it does have to be unhooked while driving in heavy snow. Rain is not a problem.
So at that RPM the engine feels much stronger than it does up at the 3000 RPM max HP range.
A turbo would change that feeling.
What do you have for an intake?
The stock intake is a bit restrictive, and have you removed the soup bowl from under the air cleaner lid?
Both mods will give small gains in engine responsiveness, also with the exhaust mod you have done, you should be getting plenty of air out of the engine. Now you need to get more cool air into the air cleaner and engine.
https://www.ford-trucks.com/user_gal...photoid=100545
This is a mod on my truck for ram air. Does a nice job. But it does have to be unhooked while driving in heavy snow. Rain is not a problem.
Laughing Gas
Joined: Mar 2006
Posts: 1,083
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From: Fitzpatrick Alabama
You can take the lid off the air breather and turn it upside down and screw it back on, this will get more air into the engine. A turbo will help this too. Your truck should have 4.10 rear end unless it has been changed. A big crew cab like you have is not going to get much better though, they are made for hauling, not hauling a**.
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I have a '92 6.9 extended cab 5 speed and it takes off to 60 in about 25 seconds or so. I live in the foothills, so that doesn't help much either. If I had to describe it, my truck jogs more than it runs to speed. Definately a true work horse though....
New User
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have to agree with the fuel problem, but dont expect it to take off like BB 460 would. These engines arent the new PS were ford has to make a V10 to keep up with them on HP numbers.
Check the fuel filter, also check the fuel lift pump on the driverside engine and check the rubber hose and make sure its not kinked up. On trucks originally equiped with the 7.3 from the hard line from the tank right before the lift pump they had to make a loop because of the angles and distance. If replaced it must be the same length so it wont kink, or the rubber will soften enough to collapse. A lift pump is only $20 from napa, or you can flow test it for volume and pressure, i think its 4-6 psi, not sure, just run a search or someone else may chime in.
Check the fuel filter, also check the fuel lift pump on the driverside engine and check the rubber hose and make sure its not kinked up. On trucks originally equiped with the 7.3 from the hard line from the tank right before the lift pump they had to make a loop because of the angles and distance. If replaced it must be the same length so it wont kink, or the rubber will soften enough to collapse. A lift pump is only $20 from napa, or you can flow test it for volume and pressure, i think its 4-6 psi, not sure, just run a search or someone else may chime in.
