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    97 4.6 Engine Fire!

    I feel like an idiot but I caught my passenger side of my 97 4.6 (198K miles) on fire a couple days ago. Here's the back story... I was getting some random misfire codes (Cylinder #3) and rough idling. So I replaced spark plugs, and checked the coil packs, and wiring. All was good. Drove again...
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    4wd not engaging '97 expedition/4.3

    About a year ago, my wife and I bought a 97 Expedition, 4.3 liter for her to haul the kids around in, and we purchased it knowing that the 4wd would not engage. Last year around this time, I didn't have time to troubleshoot it so it's been running on just fine (well except for replacing both...
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    '98 Expedition 4.6 Random Misfire

    To follow up with this thread. Had the heads redone at the local machine shop for $300 a piece. On the recommendations from others I made sure to order Ford OEM gaskets for reassembly. Today I finally got the last bolt on, and fired the truck up. Turned over just fine, and I ran it for a few...
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    '98 Expedition 4.6 Random Misfire

    To answer your questions. I don't drive the truck on a regular basis, so I wasn't the one that would have noticed anything regarding driveability. The few times that I drove it before I pulled the code, I noticed a little loss of power at certain RPMs, but nothing I could pinpoint. If you read...
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    '98 Expedition 4.6 Random Misfire

    Pulled the head off after a couple of partial days of tear down. Found out today that the culprit is/was a bent #8 intake valve. In the process of cleaning the head to see if any visible cracks are present, but I may end up just getting rebuilt heads.
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    '98 Expedition 4.6 Random Misfire

    Update on trying to find the problem. Pulled the EGR hose valve off after soaking overnight. Ended up buying a 27mm wrench to use, as the adjustable wrench just wouldn't get tight enough. Broke free after a couple of hard pulls. My FIL and I then tried to find TDC on #8 by hand spinning the...
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    '98 Expedition 4.6 Random Misfire

    To follow up from earlier today. My father in law came over, and we reran the leakage test. Neither one of us heard anything escaping from the #7 cylinder head, but we both heard and felt air leaking from the intake side. So, we started pulling off pieces to get the valve cover off to see if we...
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    '98 Expedition 4.6 Random Misfire

    So I tested #8 this morning, and I got air coming out of the #7 cylinder. I also had a little bit of air coming out of the intake, but it wasn't nearly as much volume as the #7 cylinder. I reversed the test by putting air into the #7 and got some air coming out of the #8. Not as much as from 8...
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    '98 Expedition 4.6 Random Misfire

    I was looking up leakage tests as well, but I wasn't sure if it was worth measuring the specific amount of leakage, or to simpler understand if it's the head or crankcase. I'll fire up my compressor in the morning and see what I can come up with.
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    '98 Expedition 4.6 Random Misfire

    So I'm not sure if it's good news or bad news.... I check the fuel injectors and they are all good. I even pulled the #8 off and double checked that it was getting the right resistance readings. While I was pulling the fuel rail off, I pulled the #8 plug. The #8 plug was black, and had a layer...
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    '98 Expedition 4.6 Random Misfire

    I cleaned out the throttle body after taking it all off. Both of the air intakes from the EGR were badly clogged, one was so bad that not even compressed air would blow through. I couldn't believe how clogged up both of them were! So I cleaned everything really well and reinstalled. Truck ran...
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    '98 Expedition 4.6 Random Misfire

    Thanks for the tips. I will pull apart the throttle body & EGR and clean them both. Should I use any special 'throttle body' cleaner, or would a general purpose cleaner like MEK work? That link will point me in the right direction. I used that site earlier to try and trouble shoot the EGR code...
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    '98 Expedition 4.6 Random Misfire

    I have not cleaned out the throttle body, but I did notice when I pulled the EGR off there was some carbon build upon the EGR and the throttle body. Could this be causing the misfires?
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    '98 Expedition 4.6 Random Misfire

    I have a '98 expedition with 144K miles. I need some help troubling shooting a random misfire in the #8  cylinder(s). About a month ago, I had the following CEL codes; #8 misfire, system to lean (bank 1&2). I changed out the plugs, wires, and coil packs, and reset the CEL. I never got any codes...

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