early '99 7.3l issue.. Engine DONE?? - Ford Powerstroke Diesel Forum
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post #1 of 7 Old 01-01-2012, 12:12 PM Thread Starter
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early '99 7.3l issue.. Engine DONE??

So I bought this truck 1 month ago drove it houston Texas from phoenix az and the motor blew, or so a shop told me..
Compresstion is between 250&350 on all cylinders But They may not have been telling the truth

the truck started smoking when cold, then allways at idle. and now it smokes on throttle..
Still has power and dosent run rough..
Smoke also comes from the oil fill cap...

ANY ideas? all of the people i have talked to dont know.. so many possiblities.. I need new friends? lol


Here is a link to a youtube video of my truck..
I can email anyone a better video..
1999 f250 diesel - YouTube
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post #2 of 7 Old 01-01-2012, 12:24 PM
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How much smoke from the oil filler tube? If it's a lot you probably lost a cylinder or more.
Smoking cold tends to not be bad but always is worse. And on throttle is worse.
Are you losing coolant? Is there any contamination of oil, coolant, or fuel in between each other?



2000 F-350 Lariat Super Duty, Dually, CCLB, 7.3L
4R100, 2wd
330,000 + miles
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post #3 of 7 Old 01-01-2012, 12:35 PM Thread Starter
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Its a large puff about every second..
If i lose a cylinder why is it still running fine? Wouldnt a cylinder not fire under 350psi?

Im not loosing any coolant, any oil.. The shop that did my compression test bent my dipstick tube, so I cant check my oil.

Over about 1200 miles I was getting 10-15mpg no more....
Thats not good
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post #4 of 7 Old 01-01-2012, 12:42 PM
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10 is not good but 15 isn't too bad.
If the blowby is a steady stream then that means everything is worn evenly but a single big puff like that could be a cylinder.
Idk if it would fire not.
They'd be buying and installing a new dipstick tube



2000 F-350 Lariat Super Duty, Dually, CCLB, 7.3L
4R100, 2wd
330,000 + miles
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post #5 of 7 Old 01-01-2012, 12:44 PM Thread Starter
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I might add The truck has 228K miles...
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post #6 of 7 Old 01-01-2012, 04:18 PM Thread Starter
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post #7 of 7 Old 01-02-2012, 08:06 AM
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When I dropped a cylinder in my 6.5, it smoked worse than that out of the fill tube. That definitely looks like a cylinder is dead or dieing though with the distinct puffs of smoke. If you hold your hand over the open oil fill cap, can you feel pressure pulses?

I have also heard that a proper running truck won't have enough pressure to blow the oil fill cap (placed upside down) off the fill tube, if its putting pressure into the crankcase like yours looks like, it should blow the cap off the fill tube.
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