Accelleration
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Senior User
Joined: Sep 2009
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Accelleration
1999 PSD F250 SD Stock, no mods Automatic
When I bought my truck used, from a stop I would be able to press the pedal to the floor and the truck would accellerate fast and push me back into the driver's seat. Over the past year I noticed that this doesn't happen. From a stop, the truck moves forward slowly until the turbo spools up and kicks in. Seems to me I notice it the most when the engine is cold. When it has sat over night or during the day at work. When I pass on the highway, I get that kick back in the seat feeling. The truck runs fine, just seems to have this dead time before the turbo kicks in. Need some direction here for a repair or adjustment.
Any and all responses appreciated.
Thanks
Jeff
When I bought my truck used, from a stop I would be able to press the pedal to the floor and the truck would accellerate fast and push me back into the driver's seat. Over the past year I noticed that this doesn't happen. From a stop, the truck moves forward slowly until the turbo spools up and kicks in. Seems to me I notice it the most when the engine is cold. When it has sat over night or during the day at work. When I pass on the highway, I get that kick back in the seat feeling. The truck runs fine, just seems to have this dead time before the turbo kicks in. Need some direction here for a repair or adjustment.
Any and all responses appreciated.
Thanks
Jeff
Hook it, I'll pull it.
Joined: May 2007
Posts: 15,037
Likes: 4
From: Grand Lake, La.
Hey Jeff, Welcome to FTE. First off, never floor your truck when it is cold. The oil needs to warm up so it will flow better to fire the injectors. You should check all 6 boots to make sure you don't have a leak in one, and make sure the clamps are tight. Once you get a few mods done on your truck, then you will feel the power of the 7.3. These trucks are not very fast in stock form. Make sure your oil is full and fresh, the air filter is clean, the fuel filter is clean. This is where I would start. 
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Thanks for the reply. I have checked the boots and clamps. All are good and tight.
I'm leaning toward the EBPV and I need to get an idea of what the boost from the turbo is as well under a load. No guage as of yet. Service items are always within the service intervals.
I'm leaning toward the EBPV and I need to get an idea of what the boost from the turbo is as well under a load. No guage as of yet. Service items are always within the service intervals.
Hook it, I'll pull it.
Joined: May 2007
Posts: 15,037
Likes: 4
From: Grand Lake, La.
Take a look at your up-pipe flanges, if you see black soot around it, then you have a boost leak. Here is how to do the EBPS and tub cleaning. click here
Having gauges, even without mods is helpful with seeing some problems.
Having gauges, even without mods is helpful with seeing some problems.
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I replaced the up pipe flange gaskets a year ago because of the diesel fumes inside the truck. The ones I replaced were definately bad. The tube/sensor cleaning I complete every other oil change since I replaced it two years ago. The tube I had replaced was all corroded and eaten thru. Is there any adjustment on the EBPV itself? Thanks again
Jeff
Jeff
Hook it, I'll pull it.
Joined: May 2007
Posts: 15,037
Likes: 4
From: Grand Lake, La.
There is no adjustment on the EBPV, but you can take it out and do away with it. The only thing it does is, it closes when the temp are cold and puts a load on the engine to help it warm up, at start up.
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Well, I'd better not do that since I live in Reno and it does get cold here during the Fall thru the Spring. Say, Thanks for all your input..Have a great day.
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Joined: Mar 2003
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From: northern Michigan
On a nonmodified truck I see about 5 psi of boost at 70 miles an hour steady state. It will wander a bit depend on if you are going down hill or uphill but that is average normal. Under heavy acceleration or towing it will go higher. I have seen 20 psi on mine when accerating hard with a trailer behind but once down to steady state it usually drops to around 8-10psi. boost is determined by the amount of fuel you add and the extra air the turbo is adding once you spool up the turbo. Below 2000 rpm without a tow you won't see a lot of boost.
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