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GMC serria: i have a 1996 6.5 turbo diesel also, it accelerates

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i have a 1996 6.5...
i have a 1996 6.5 turbo diesel also, it accelerates fine but when you get to speed like 55 mph and let off to maintain that speed it's like you took your foot off the accelerator
Submitted: 2 years ago.Category: GMC
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Answered in 8 hours by:
7/31/2015
GMC Mechanic: Toolhut, ASE Certified Technician replied 2 years ago
Toolhut
Toolhut, ASE Certified Technician
Category: GMC
Satisfied Customers: 551
Experience: Owner of a mobile diagnostics company assisting auto technicians with difficult vehicles
Verified
Hi, My Name is***** have over 20 years experience repairing vehicles. I am a ASE Certified Master Auto Technician. I am confident we can resolve your problem together.Please remember I don't know your skill level. I can't see, smell, hear, or touch the vehicle. It may take a few back and forth replies to get to a satisfactory resoloution. Try your best to respond with good detail so I can do the same.Have you done any testing? I am suspicious you have a fuel delivery problem. Plugged filter or mechanical fuel pump. Do you have any test equipment?
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Customer reply replied 2 years ago
no test equipment but have replaced filter
GMC Mechanic: Toolhut, ASE Certified Technician replied 2 years ago
The next thing I would check is fuel pressure and volume from the mechanical pump. There is a possibility that you have a Injector pump module that is causing problems. But You need to rule out the fuel pump first. There is an upgrade to remount the module if it is still attached to your injector pump to out of the engine so it cools better. Do you know if there have been any upgrades done to this engine?
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Customer reply replied 2 years ago
yes i have already replaced PDM on a cooler
GMC Mechanic: Toolhut, ASE Certified Technician replied 2 years ago
I do not know where to tell you to go so I am going to opt out and see if a different professional has any suggestions.
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GMC Mechanic: JFN1, ASE Certified Technician replied 2 years ago
JFN1
JFN1, ASE Certified Technician
Category: GMC
Satisfied Customers: 4,831
Experience: GM Master Technician
Verified
Is the check engine light on, or do you know/have you checked for trouble codes?
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Customer reply replied 2 years ago
the check engine light is not on and i have not checked any codes
GMC Mechanic: JFN1, ASE Certified Technician replied 2 years ago
I'm trying to wrap my mind around your symptom. When you say it's like you took your foot off the accelerator when you are trying to drive at steady speeds, what exactly is going on? Does the engine go to idle?
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Customer reply replied 2 years ago
I don't take my foot off I just ease off to allow the truck to slow a bit it it fells like I take my foot off compleatly
Customer reply replied 2 years ago
You can see tack drop in rpm
GMC Mechanic: JFN1, ASE Certified Technician replied 2 years ago
Do you think it's an engine issue, or is it a transmission issue?
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Customer reply replied 2 years ago
I'm thinking engine but could be wrong
Customer reply replied 2 years ago
Today I put transmission in neutral and pressed the throttle slightly and engine reved to 4000 rpm , as I drive it to town later I noticed if I left foot on throttle slightly it would increase in speed and blow out black smoke so seems engine is running away to me
Customer reply replied 2 years ago
Did you give up too ?
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Gm Tech (Cam)
Gm Tech (Cam)
Gm Tech (Cam), GMC Mechanic
Category: GMC
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