7.3 Turbo Diesel pedal response slow to respond - Ford Powerstroke Diesel Forum
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Old 01-23-2014, 02:58 PM
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7.3 Turbo Diesel pedal response slow to respond

First time here, and thought some of you pros could help.
1999 7.3 starts idles fine and also accelerates while in park or N. Put it in gear pull out on the road and all it does is idle. You can push the accelerator all the way down, pump it and it does nothing for a 1/2 mile or so, or if you get on a downhill run. Then it starts to take off and accelerates sluggishly. I have changed the TPS, and drained the fuel bowl. This happens when it is very cold 0-15 deg F, and not so much in warmer temperatures. Is there an air flow sensor or a air temp sensor that might be bad? Need some help
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Old 01-23-2014, 03:52 PM
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If this is a not at all above 32 degrees, I would say that you have a possible fuel gelling issue, causing an inlet restriction, and low power/no response. If this is a less common occurrence in warmer temps, but still happens situation, I would verify fuel pressure when the condition is present. APP and air temp sensors don't care if the trans is in neutral or not, but the engine uses a whole bunch more fuel under boost in gear than it does revving in neutral.
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Old 01-23-2014, 05:09 PM
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During the cold periods I have added a anti gel and boost.
Is there an aux fuel pump to assist fuel to get to the engine, tat might not be performing ?
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Old 01-24-2014, 07:41 AM
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The fuel pump is on the frame rail. You should check fuel pressure at the fuel filter. There is an access port on the rear of the filter housing. Its thread is a -4 AN. Get the proper adapter and verify proper fuel pressure under load. If it cant maintain 45 psi, disconnect the fuel line at the rear of the pump. You can use compressed air to blow some air into the tank at the filler neck. Don't use a lot of pressure. 2-5 psi is fine. You should see fuel flow at a pretty good clip from the disconnected line. If this is not the case, the line could be frozen or restricted. If you have no restriction, and the fuel pressure is low, replace the pump and filter, and retest.
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Old 01-24-2014, 09:23 AM
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Thanks I'll give it a try
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Old 01-24-2014, 09:23 AM
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Thanks Ill give that a try.
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