Low Boost and Sluggish Acceleration - Page 2 - Ford Powerstroke Diesel Forum
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post #11 of 23 Old 02-26-2008, 10:25 AM
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Try temporarily unhooking your map sensor...maybe its gone bad and is telling the engine to defuel before boost pressure is able to get built up. Also make sure that the wastegate is not stuck open...does it move when you push on its shaft? Is it closing all of the way? Just some thoughts that don't cost anything to try.
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post #12 of 23 Old 02-26-2008, 10:30 AM
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first think i would always want to know in this situation is fuel pressure.....

it could be the IPR...but i doubt it.....its almost always fuel pressure or a bad map sensor...
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post #13 of 23 Old 02-27-2008, 11:29 AM Thread Starter
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What would cause low fuel pressure? I recently replaced the lift pump under the turbo pedistal, so I think that component is fine. Assuming the fuel pump is fine, the only other component that could cause this is the fpr, right? As far as the map sensor is concerned, will simply unplugging it give me any indication if it is the problem or will that just throw a code and make it run like crap? Is there any easy way to check the fuel pressure?
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post #14 of 23 Old 02-27-2008, 12:01 PM
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Originally Posted by Stinkers View Post
What would cause low fuel pressure? I recently replaced the lift pump under the turbo pedistal, so I think that component is fine. Assuming the fuel pump is fine, the only other component that could cause this is the fpr, right? As far as the map sensor is concerned, will simply unplugging it give me any indication if it is the problem or will that just throw a code and make it run like crap? Is there any easy way to check the fuel pressure?
Uh, the lift pump is located on the driver's side frame just forawrd of the fuel tank...not sure what you would have replaced under the turbo pedistal, but I don't think it was the lift pump.

Unplugging the MAP sensor (temporarily) will let the turbo build up pressure if the MAP sensor is bad. If the MAP sensor is good nothing should change.

To check the fuel pressure you can hook up a fuel pressure gauge to the plug on the back of the fuel bowl for testing purposes. If you do it yourself maybe cost about $30 for the parts.
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post #15 of 23 Old 02-27-2008, 04:38 PM Thread Starter
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On an OBS powerstroke, there is a mechanical fuel pump that bolts in the engine valley and runs off of the cam. There are two steel fuel lines that go to each head and rubber lines that go directly into the fuel filter canister. This is the pump that I replaced.
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post #16 of 23 Old 02-27-2008, 05:16 PM
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Ok...learn something new everyday. So what is an "OBS" powerstroke? And the fuel pump is really under the turbo pedistal...wow, not much room there I would think to get to work on it.
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post #17 of 23 Old 02-27-2008, 05:34 PM Thread Starter
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OBS is just an acronym for "old body style", i.e. non factory intercooled models. 1997 was the last year for them because ford didn't produce a heavy duty truck in 1998. No, there isn't much room at all, takes some patience to work on. I unplugged the map sensor and it didn't make any difference. Boost levels are the same as well as everything else. I'll try the IPR that I got in the mail today and see if that works.
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post #18 of 23 Old 10-08-2009, 04:53 PM
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CHECK THE SOCKS IN TANK
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post #19 of 23 Old 01-18-2011, 05:22 AM
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how did the story ended? did the new pump help? is this a critical part in the acceleration of the truck? I fixed my hpop and it doesnt accelerate as it did before it failed, but im not sure if that is the problem now...
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post #20 of 23 Old 01-19-2011, 05:55 PM Thread Starter
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It actually turned out to be bad injectors. I replaced them with Stage 1's from Rosewood diesel which eliminated the problem. Then, I put a 17* HPOP on it with a TW chip for good measure. The truck really flies now. I have put about 40k on it since changing the injectors and have not had a single problem since.

1997 F250HD 4x4 Crew Cab E40D 197K
Rosewood Stage 1's
17* HPOP
Banks Technicooler
TW Tunes
Bully Dog 3 inch DP
Custom Intake
Pyro, Boost, Oil Press. Gauges
Warn Manual Locking Hubs
Tuff Country 2.5" Lift
Bunch of other extras
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