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  1. H

    1998 5.4 engine question

    So this is not my daily driver. Noticed a while again intermittent power issues. This engine has about 100k on it. Long story short I replaced injectors and coils and also put in new fuel filter and pump in the tank. Still had issue. So removed entire exhaust and only have manifolds on...
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    1998 5.4 engine problem — STUMPED

    I also recorded some data when I was revving and idling. Short term fuel trim bank 1 0. Stft bank 2 0. Stft b1s1 0. Stft b1s2 99.22%. Stft b2s1 0. Stft b2s2 99.22%.
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    1998 5.4 engine problem — STUMPED

    Quick update. I got a nicer obd2 scan tool which showed a bad cop on cylinder 1. Put a new one on and the engine runs much smoother. Still noticing a few odd things. After sitting overnight the fuel pressure slowly rises to 30 after cranking and running. Like a minute. When I smash...
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    1998 5.4 engine problem — STUMPED

    Ok have made some progress. Grabbed a fuel pressure tester and hooked to schrader valve. No pressure. Maybe a pound. I looked underneath and remember when I last changed the fuel filter I broke a quick connect tab to the filter. I chopped the lines and used barb fittings. Well one of the patch...
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    1998 5.4 engine problem — STUMPED

    Background. Engine replaced and has about 15k miles on it. Ran awesome for a few years and then I started noticing some lower power at load and high throttle. Missing and sounds like misfires in engine. It got worse and worse to the point of not being able to go up a simple hill. No vacuum...
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    Warm HEAT - Weird plenum issue

    Quick update I bit the bullet and replaced the heater core myself. Believe it or not it fixed the issue. Not sure why as flow was good through the cors, but if you have exhausted all options change the core. The heat is so hot I now have to turn it down. also removed the rod that I put in...
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    Multiple Radiator replacements

    Omg same problem So after reading all pages I am laughing. I have replaced my radiator 4 times in the past year. Same leaking location as yours, passenger side of radiator. What is strange is that I found a 5.4 engine from a vocational school that had maybe 100 miles on it. They had taken...
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    Warm HEAT - Weird plenum issue

    The one behind the glovebox. Not the one controlled by the warm cold selector.
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    Warm HEAT - Weird plenum issue

    Well a $2 fix gave me hot heat. I tool a threaded rod and closed the fresh air door. I will remove in the spring. I now have 135 out the vents at 20deg. Before I closed the door I was getting about 110 but this did the trick. Hope it helps someone
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    Warm HEAT - Weird plenum issue

    Thanks for the temp reading. I did get the 195 thermostat. I may permanently close the fresh air door behind glovebox to increase heat. Someone posted similar issues with cold air in that area and also did that. Will keep you posted. Thanks
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    Warm HEAT - Weird plenum issue

    Just checked temps Ok just verified recirc door to outside air is closed on heat mode. Also checked temps. Upper radiator about 170ish and lower radiator about 165ish. Heater core inlet 170ish and return heater core hose 165ish. Inside with the cutout behind glovebix heater core temps...
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    Warm HEAT - Weird plenum issue

    1998 Expedition 5.4. Here is what has been done: Replaced radiator New water pump Blend door verified to work Recirc door behind glovebox closed. New thermostat Engine gets to operating temp, all hoses hot,both heaterc core hoses hot. When I began looking at the blend door, after I...
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    A/C Help Needed Please

    Thanks for the help. When I replaced the ac lines I left the high pressure cutoff switch off the new piping. Hooked it back in and reconnected the dongle and all is good. Always something small. Thx
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    A/C Help Needed Please

    1998 5.4 Expedition. Just replaced engine and put in new compressor, dryer, condensor, all hoses, etc. The A/C clutch is not engaging. Here is what I have done and found. There is NO voltage to the low pressure cutoff switch on the accumulator. None. I jumpered 12V to the cutoff switch...
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    99 pi swapped into 98 non-pi

    Thx. Just messaged swagga. I am confused what the top sensor is then that is doubled to the hose. I would think that would be the temp sensor.
  16. H

    99 pi swapped into 98 non-pi

    Thx for the updates. I did see a sensor with a connector coming out of the drivers side head. Man I hope this thing doesn't light up with error codes like a Christmas tree when I go to start it. What about the old intake connector at the lower intake then? The new intake doesn't have a...
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    99 pi swapped into 98 non-pi

    Ok, so I have completed the swap of the motor. I have a 1998 5.4 expedition and the motor I swapped has the PI heads and intake from I believe a late 1998 or early 1999. I am trying to post a pic of the old and new intake. I am confused if I will have problems because the old manifold has an...
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    Replacing Engine - Need advice

    So I am in the process of pulling my 5.4 out of my 1998 expedition. Everything is disconnected, ready to pull, but I need to make sure of something. There are 4 torque converter bolts, which are removed, but I cannot get the torque converter pushed back enough to where the bolt heads do not...
  19. H

    1998 fuel rail / prime

    So I replaced all coil packs and injectors, egr tube, new exhaust system and she runs great. However, I did have to pop off the fuel rail on drivers side to get the one coil pack out. The problem is that I now have a 5-10 second crank time to start. I never had that before. Used to fire...
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    Oil cooler line

    I have a 1998 5.4 4x4 with the E40D. I am replacing rusted tranny oil cooler lines. I replaced the lower with dorman 624202. I thought the upper was 624226 but it was not. I do not have an aux oil cooler. Any ideas? All the sites show 4R100, confusing. Thanks

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