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  1. E

    03 5.4L Oxygen sensor replacement question

    OK. That makes total sense. Thanks a million!
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    03 5.4L Oxygen sensor replacement question

    I'm looking to replace all 4 of my O2 sensors. I'd like to go with Bosch sensors. However, distinguishing between the correct upstream unit and correct downstream unit is not easy (for me at least). For example, for my vehicle, Amazon shows the Bosch 15717 part as being downstream. You go to...
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    2003 5.4L 4x4 - Fuel Feed or Return Line?

    Thanks for asking. I was about to say that I had a problem, but then I just replaced the fuel pressure damper, cleaned the PCM connections, reset the PCM, and the stuttering went away. Thanks again!
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    2003 5.4L 4x4 - Fuel Feed or Return Line?

    Perfect. Thanks a million. One follow-up question: Does Ford consider this to be a "return" or a "returnless" fuel system? Normally a "return" system would have a line from the fuel rail back to the tank, in addition to the feed line. The system you describe (which is the one I have) has a fuel...
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    2003 5.4L 4x4 - Fuel Feed or Return Line?

    I'm asking this because the Hayne's manual lacks this information and because I have seen contradictory information on the internet. Some sites say the fuel pressure regulator on the fuel rail is directly connected to the feed line, others say the return line is the one connected to the...
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    2003 5.4L // DPFE Sensor Electrical Question // Repeated DPFE Failures

    I thought I had multiple DPFE failures, but I now think it is the wiring or Powertrain Control Module. I just ran a test on the signal wire(the top one of the three in the photo). According to the Haynes manual, with the engine running cold, that wire should show .2 to .7 volts. When the engine...
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    2003 5.4L 4x4 - low RPM shudder / hesitation / poor MPG

    Sorry about that. Here it is: https://www.amazon.com/Motorcraft-DPFE15-Recirculation-Pressure-Feedback/dp/B001BS9K3I/ref=sr_1_3?dchild=1&keywords=motorcraft+dpfe&qid=1607098449&sr=8-3
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    2003 5.4L 4x4 - low RPM shudder / hesitation / poor MPG

    PROBLEM SOLVED: Even though I replaced the DPFE a month ago, the problem ended up being the DPFE! The moral of the story is this: Do not buy a non-Motorcraft DPFE because you will be replacing it within 100-500 miles, probably. You can buy the Motorcraft OEM part on Amazon for $64. I would...
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    2003 5.4L 4x4 - low RPM shudder / hesitation / poor MPG

    Yeah, that is one possibility I am considering. It actually shifts smoothly, no clunking, no slipping gears. So I can still hope! Before I face the possibility of tranny work, I am trying to eliminate vacuum leaks as a possibility, thanks to the suggestion of bigdogchrisl. So, I learned that...
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    2003 5.4L 4x4 - low RPM shudder / hesitation / poor MPG

    Interesting. I agree, working back there is no fun. Did it throw a code?
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    2003 5.4L 4x4 - low RPM shudder / hesitation / poor MPG

    I agree that I need to go back over the hoses all around the area, considering I also redid the PCV valve recently. I noticed that the EVAP return hose (the longish black one with the little green fixture on the end) is dry and corroded, but not broken. I hope the repair turns out to be...
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    2003 5.4L 4x4 - low RPM shudder / hesitation / poor MPG

    Thanks for the info. I have scanned it multiple times while driving and have not had a single misfire code or any other code. If a plug was bad, wouldn't a code definitely be thrown? I am almost to the point of bringing it in to have a professional-grade scanner hooked up to it, before...
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    2003 5.4L 4x4 - low RPM shudder / hesitation / poor MPG

    Perfect. Thanks again.
  14. E

    2003 5.4L 4x4 - low RPM shudder / hesitation / poor MPG

    A follow-up question: where was the crack on your manifold? I have dealt with internal cracks on my Crown Vic's manifold, which caused coolant loss. The Expy leaks no coolant. So, I'm guessing the crack could be on the upper/visible part of the manifold? Thanks.
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    2003 5.4L 4x4 - low RPM shudder / hesitation / poor MPG

    Excellent suggestion. I'll check it out. Thanks.
  16. E

    2003 5.4L 4x4 - low RPM shudder / hesitation / poor MPG

    Recently purchased a used 2003 Exp Eddie Bauer, 4x4, 5.4L with 181k miles. Recent maintenance: - plugs and coils - all EGR related components - cleaned MAF - fuel filter - changed all fluids to spec Problem: This began after I changed (drain & fill) the tranny fluid so I am hoping it isn't...
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    '03 Expedition 5.4L Power Steering Pump / Pressure Line

    I can now answer my own question: it is a real pain in the butt to attempt to remove the pump without taking the pressure hose along with it. I removed them together and decided to just replace the hose in the process. Case closed.
  18. E

    '03 Expedition 5.4L Power Steering Pump / Pressure Line

    Hello! I am in the process of removing a very leaky power steering pump. I would like to remove just the pump and leave the pressure line connected to the steering rack. Is this possible? Or is the best/easiest way to do this to remove the pump and leave it connected to the pressure line when...
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