Early 99 7.3 white smoking all the time - Ford Powerstroke Diesel Forum
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post #1 of 13 Old 03-24-2014, 06:12 PM Thread Starter
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Early 99 7.3 white smoking all the time

ok here is my long story, and I know there are a lot of white smoke threads out there, but I bought the truck in the summer time, didn't smoke or anything. but when it started getting colder I couldn't get it to start without plugging it in. so I replaced the glow plugs, relay, harness, pigtails, which didn't work. so I went for the injectors, got some stage one injectors, swamps icm, six position t.w chip, new hpop. now the truck starts right up in the cold weather but white smokes so bad I cant even drive it. I have continuity threw at the terminals on the injector plugs, I unplugged all the injectors one by one to to make sure each one was working. The number seven injector was causing smoke when plugged in, but didn't cause the engine to change when unplugged. any suggestions would be greatly appreciated. I am also new to the forum and this is my first diesel so go easy on me if I skipped something simple
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post #2 of 13 Old 03-24-2014, 06:55 PM
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Early 99 7.3 white smoking all the time

Alright when you say number seven ran the same unplugged did it stop smoking? You may have a cracked nozzle which should be under warrantee.

Edit: also pop your oil fill cap. Do you have excessive blow by.
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post #3 of 13 Old 03-24-2014, 07:03 PM Thread Starter
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I thought of the, so I switched that injector with another and the injector itself didn't change just the #7 position.

what would be happening with the blow by?
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post #4 of 13 Old 03-25-2014, 09:22 AM
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It will chug. Another words you wont have a steady haze of smoke. Test is take off the cap while its running and flip it over and set back on the fill tube. If it blows it off you have a dusted cylinder.


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post #5 of 13 Old 03-25-2014, 04:04 PM Thread Starter
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My valve covers are off right now, so should I jut do a compression test? any suggestions or compression specs?
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post #6 of 13 Old 03-25-2014, 05:30 PM
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Early 99 7.3 white smoking all the time

Ford specs say around 400-425psi. When you run the test crank the engine over 5 revolutions and thats your number. Anything under 350 is getting on the weak side. If you're going to do all 8 pull all the glow plugs out for the test that way the engine spins freely. If doing just 2 cylinders leave your plugs in. Good Luck.

Can you plug harness back in an start it with covers off? You'll notice bad blow by even with covers off.


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post #7 of 13 Old 03-25-2014, 05:47 PM Thread Starter
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what would I do for the blow back with the covers off?
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post #8 of 13 Old 03-26-2014, 03:00 PM Thread Starter
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What could have happened from when I parked it and changed the injectors to now? it doesn't seem gutless any more like it did before. just smokes like crazy
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post #9 of 13 Old 03-26-2014, 04:50 PM
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Have you driven it at all?


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post #10 of 13 Old 03-26-2014, 04:59 PM Thread Starter
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Not really . Up and down the drive way. It smoked so bad I didn't want to put it all back together of I had to take it apart again. Do you think it just needs to be ran?
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