no turbo boost
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no turbo boost
I have an 88 f-350 with a 7.3L with only 59,000 miles. It has a Banks turbo with no boost psi and very little power. Replaced O-rings on injectors today to stop fuel leaks, has no exhaust leaks, turbo spins. This is my first Diesel and my 5.4 triton in my expedition can run circles around it. Anyone know what the problem is?
Post Fiend
Joined: Nov 2003
Posts: 21,285
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From: Nutter Fort, WV
birdnestfarm,
Welcome to FTE and the IDI diesel forum.
First thought is the air cleaner condition, recently changed?
Are you seeing any black smoke when you floor it going up a hill?
Do you have a boost gauge or are you going by sound?
Welcome to FTE and the IDI diesel forum.
First thought is the air cleaner condition, recently changed?
Are you seeing any black smoke when you floor it going up a hill?
Do you have a boost gauge or are you going by sound?
Senior User
Joined: Sep 2007
Posts: 317
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From: Snohomish, WA
Your exhaust temp gauge (exhaust gas temperature , or EGT) is a pyrometer. It would be good to know where the temperature probe is placed on your truck (before or after the turbo). What is your exhaust temp gauge reading when you are making 3 PSI of boost?
Post Fiend
Joined: Nov 2003
Posts: 21,285
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From: Nutter Fort, WV
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From: West Valley Utah
With only 3 psi, loaded and pulling there either has to be an air restriction or something is keeping the impeller from winding up. That is assuming that you have no intake or exhaust leaks anywhere.
I would think that even if the fuel had not been turned up, that under a load and pulling, the turbo would be capable of boosting more that 3 psi.
Maybe the IP is going junk. Low mileage but still it's over 20 years old. The plastic coupler (internal in the injection pump) could be coming apart and restricting fuel.
How about the muffler? Is it OEM or does it have the Banks 3" that could be ordered with the turbo? If it's the original muffler it could be plugged up (again age related and falling apart inside)
I would think that even if the fuel had not been turned up, that under a load and pulling, the turbo would be capable of boosting more that 3 psi.
Maybe the IP is going junk. Low mileage but still it's over 20 years old. The plastic coupler (internal in the injection pump) could be coming apart and restricting fuel.
How about the muffler? Is it OEM or does it have the Banks 3" that could be ordered with the turbo? If it's the original muffler it could be plugged up (again age related and falling apart inside)
Post Fiend
Joined: Nov 2003
Posts: 21,285
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From: Nutter Fort, WV
Since there is no throttle body on a diesel, it takes in a full charge of air on every intake stroke.
The only thing that can cause less air to enter the cylinder is either a clogged filter or some other restriction in the intake.
The amount of fuel injected is all that causes the engine to speed up or slow down.
So every time you are slowing down, the engine is running "lean" to use a gasser term.
When you are accelerating, the engine is running "rich" when it starts to give off any black smoke.
Part of the reason a diesel can get better fuel mileage is the fact there is no optimum fuel air mixture that is maintained constantly like it is in a gas engine.
When you are slowing down as long as the engine speed is higher than the govenor is asking for, there is no fuel injected.
With no leaks in either the turbo boost side or the exhaust manifolds to turbo connections, there is only a couple things left that can result in low boost.
Restrictions in the air intake, restrictions in the exhaust after the turbo, or not enough fuel going to the engine making heat to drive the turbo.
The only thing that can cause less air to enter the cylinder is either a clogged filter or some other restriction in the intake.
The amount of fuel injected is all that causes the engine to speed up or slow down.
So every time you are slowing down, the engine is running "lean" to use a gasser term.
When you are accelerating, the engine is running "rich" when it starts to give off any black smoke.
Part of the reason a diesel can get better fuel mileage is the fact there is no optimum fuel air mixture that is maintained constantly like it is in a gas engine.
When you are slowing down as long as the engine speed is higher than the govenor is asking for, there is no fuel injected.
With no leaks in either the turbo boost side or the exhaust manifolds to turbo connections, there is only a couple things left that can result in low boost.
Restrictions in the air intake, restrictions in the exhaust after the turbo, or not enough fuel going to the engine making heat to drive the turbo.
i ain't rite
Joined: Mar 2005
Posts: 65,492
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From: Marlboro Mental Hospital.
a banks turbo system mounts the pyro probe in the turbo pedestal, just before the turbo.
also, a banks non waste gated turbocharged 7.3 idi with a muffler on it will only produce 3-5 lbs boost.
if you take the muffler off, you should see around 10 lbs boost at full throttle with an auto trans, and around 13 lbs with a manual trans.
also, a banks non waste gated turbocharged 7.3 idi with a muffler on it will only produce 3-5 lbs boost.
if you take the muffler off, you should see around 10 lbs boost at full throttle with an auto trans, and around 13 lbs with a manual trans.