Getting a soft "thunk" when shifting from first to second
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Joined: Jan 2004
Posts: 13,851
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From: SW Va
Hold on replacing the PCV valve, if its OEM, Ford may replace the First one at no cost on the 4banger.
Good that you used Mercon-V tranny fluid.
Yup, the oil pressure sensor/switch is known to leak between its plastic insulator & metal case & or around its center electrical connector.
The high mileage oils also have more detergent cleaner uppers in their ad packs, so can begin a tidy up of gum/varnish on valve stems & deposit loaded ring lands, if you come to believe blow-by is some of the problem.
Good that you used Mercon-V tranny fluid.
Yup, the oil pressure sensor/switch is known to leak between its plastic insulator & metal case & or around its center electrical connector.
The high mileage oils also have more detergent cleaner uppers in their ad packs, so can begin a tidy up of gum/varnish on valve stems & deposit loaded ring lands, if you come to believe blow-by is some of the problem.
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Senior User
Joined: Mar 2012
Posts: 266
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From: WA
Ok, so, fresh Mercon-V ATF did not take care of the soft thunk. I did note though that it is definitely coming from the rear of the truck.
Unfortunately that's all I got to do with that problem today because after my trash run (about 25 miles total), as I pulled in the drive way I smelled coolant. I popped the hood and there was "green" coolant spraying out of the side of the degas bottle where the plastic had gone brittle. I knew that was a bad side but didn't know it would go so soon. But, more surprisingly is the radiator plastic end cap also sprung a leak. So I just spent the last 4 hours putting in a new degas bottle, new radiator as well as flushing out the green coolant and putting in Zerex G05 gold coolant as that is what this truck actually takes per this: https://www.fcsdchemicalsandlubrican...coolantsEN.pdf. Not sure why someone put green in it.
Unfortunately that's all I got to do with that problem today because after my trash run (about 25 miles total), as I pulled in the drive way I smelled coolant. I popped the hood and there was "green" coolant spraying out of the side of the degas bottle where the plastic had gone brittle. I knew that was a bad side but didn't know it would go so soon. But, more surprisingly is the radiator plastic end cap also sprung a leak. So I just spent the last 4 hours putting in a new degas bottle, new radiator as well as flushing out the green coolant and putting in Zerex G05 gold coolant as that is what this truck actually takes per this: https://www.fcsdchemicalsandlubrican...coolantsEN.pdf. Not sure why someone put green in it.
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Joined: Jan 2004
Posts: 13,851
Likes: 111
From: SW Va
Ok, good feedback on the thunk definitely coming from the rear, that should help narrow it down a good bit. The only thing that comes to mind right away about the rear end thunk & mounting hdw is the shocks, their mounting brackets, or bracket weld deserve to have a look see.
If that looks ok, maybe consider lifting the rear end on jack stands & have someone run the engine & shift while you listen to see if its coming from within the differential, or maybe associated more with a wheel, like with an axle bearing. Keep us posted on the trouble shoot.
Dang, sorry to hear about the cooling system woes, but sounds like you have a good grip on it.
If that looks ok, maybe consider lifting the rear end on jack stands & have someone run the engine & shift while you listen to see if its coming from within the differential, or maybe associated more with a wheel, like with an axle bearing. Keep us posted on the trouble shoot.
Dang, sorry to hear about the cooling system woes, but sounds like you have a good grip on it.
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