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Old May 25th, 2009, 10:29 PM   #1
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Default 1997 Expedition with 5.4L: excessive white smoke??

I just picked this up and I'll be the first to omit that I am somewhat clueless on fords. This is what I know on the truck thus far: It's a 1997 with 240,000 miles on it (yea I know, anything is possible). The guy I got it from actually has a pretty good service history on it since new. This is the story he gave me: "it was running perfectly fine one day, he lent it to a friend and the friend came back saying the check engine light was on and now it was smoking alot". That's pretty much all I could get from his broken english. I bought it and brought it home to do a little looking over on my own. First thing I found was that it was overfull on engine oil. Now at first I thought headgaskets because of the overfilled crankcase and the white smoke. I then checked the antifreeze and it was right where it should be at full and looked fine in cooler. I let it run for quite a while and it never overheated once. Heat works good and constant. I checked the drained oil and the only thing I found with the oil was that there was about 2 qts to much. No trace of antifreeze, just oil. I then changed the oil and drove it for about 10 miles. The smoke seems alot better, but is still there. Also, when changing the oil you could see at the back of the valve covers that the gaskets where leaking and thats where it looked as if it was trying to push out the excess oil. The only thing I found with the before mentioned check engine light was a code PO307 (Cylinder #7 missfire). You can tell when driving it that there is a miss, but it doesn't feel as though there is a great loss of power. Sorry for the long read, but I wanted to give the info I had found. My question is: Where do I go from here? What to do about the smoke? The missfire I believe to be a bad coil but don't believe that has anything to do with the smoke. Any help is definitely appreciated

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Old May 25th, 2009, 10:39 PM   #2
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Old May 26th, 2009, 01:13 AM   #3
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That code means Cylinder 7 has a bad coil over plug ($50ish). I've had a similar codes (p0302 and p0304) and those were bad. Cylinder 7 will be on the driver side, third on back. You may have to remove the air intake. It is easier if you pop off the fuel rail to get the COP out. While you are at it, you should check the plug as well. Make sure you are doing this with the engine as cold as possible, do not run it for 6 hours prior to taking the spark plug out or you risk galling the threads and making it impossible to put in a new plug.

The white smoke is most likey the unburned fuel going through the cylinder and out to the hot catalytic converter and burning there. Don't be scared of 240,000 miles, the modular engines are designed for high milage. I've been in trucks with the original 670,000 mile engine and it still hauls ass. I hope you didnt pay anymore than 1500 for it and you got a clean title.
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